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Medieval Wisdom · Practical Manual

You found the history. Now build it, or know who should.

The Medieval Wisdom Builder's Manual adds what the videos leave out: the quantities, the materials you can buy today, a Check after every procedure, and the point where you stop. Each of its 63 chapters opens with a label that says whose job it is.

Build itBuild it carefullyPlan it, hire it
Cover of The Medieval Wisdom Builder's Manual
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PDF911 pages
Cover of The Medieval Wisdom Builder's Manual: hands laying limestone in lime mortar on a low garden wall, a wooden bucket beside it, and the three chapter labels at the foot.

A PDF you download, US Letter. Not a printed book.

Bought Build It Yourself, the book or the Complete set? Don't buy this. It comes to you free, as an update to what you bought. How it works

Bought Build It Yourself? Complete buyers get this manual free; book-only buyers get a discount code by email. How it works

PDF, US Letter · First edition, October 2026 · US units first, metric in parentheses

IStart with your problem

Came from a video with one question? Start there.

Eight common problems at an old house or a small place. For each one: the chapter's own one-sentence answer, what it corrects from our videos, where the job stops being yours, and the real page.

Chapter 3.5 · p. 437

The house is cold, or the power is out

The chapter's answer, in one sentence

“Your body is a 70–100 watt heater, so trap that heat close with dry layers and an enclosed bed, add small, contained warmth (a hot-water bottle, an electric blanket used as labeled), keep one small room as warm as you safely can, and never burn anything indoors that isn't built and vented for it.”

What it corrects

Our most-watched heating video asked why medieval peasants “never froze.” The chapter's answer: “they did freeze.” It also takes back two tips from a video, a hot-water bottle filled “just off the boil” and bricks warmed in front of a space heater: “Both go against published safety advice.”

Where it stops. Space heaters, generators, hot-water bottles and heated stones are Build it carefully. Indoor braziers and charcoal are left out of the book. Installing any stove, fireplace, heater or chimney is Plan it, hire it.

Read next
  • 3.5Heat the Person, Not the House p. 437
  • 3.1The Physics of Heat p. 386
  • 2.11Warm Walls p. 311
  • 3.2Choose Your Heat p. 398
p. 437, as printed. Tap to read it.

Chapter 2.16 · p. 373

A wall stays damp, or the paint keeps peeling

A viewer, under our December 2025 foundations video: Medieval stone construction in northern Europe ensures a VERY damp interior which is not very pleasant or healthy to live in. …

The chapter's answer, in one sentence

“An old solid wall stays healthy by getting wet and drying out again, so keep as much water off it as you can and never seal in what gets through.”

What it corrects

Our video said medieval drainage “required no power, no pumps, and no maintenance.” The chapter: “It needed plenty.” And on cement, the chapter: “The harm is slower. Hard cement and plastic paint on a soft old wall trap water, and the stone or brick around them decays instead.”

Where it stops. Looking and ground-level upkeep are Build it; limewash, repointing and ladder work are Build it carefully. Cracks running through bricks or stones, a wall bulging or leaning, sagging lintels or doors that start to stick are not maintenance: the chapter sends you to a structural engineer.

Read next
  • 2.16Keep an Old House Healthy p. 373
  • 2.3Lime Mortar and Breathable Render p. 201
  • 4.4Drainage p. 541
  • 2.11Warm Walls p. 311
p. 373, as printed. Tap to read it.

Chapter 2.6 · p. 243

A base for a shed or a garden wall, where the ground freezes

The chapter's answer, in one sentence

“Fill a trench with clean, drained stone and set the wall on a concrete beam on top, so water that reaches the foundation drains down and away instead of feeding the ice that lifts it.”

What it corrects

Four corrections open the chapter. One: the trenches our video credited to Frank Lloyd Wright's mason were “about 16 inches deep, not below the frost line.” Another: “our 40–60% savings and $800–3,000 material cost have no independent source, so they're gone.”

Where it stops. A shed, a tool shelter or a garden-wall base is Build it carefully. A house, or anything someone sleeps in, is Plan it, hire it: “it takes an engineer's design and an approval,” and the chapter tells you what to ask for.

Read next
  • 2.6The Self-Draining Stone Foundation p. 243
  • 2.7Footings on Rock and Stone Walls p. 257
  • 2.12Lay a Low Garden Wall p. 324
  • 2.1Choose Your System p. 174
p. 251, Figure 2.6-A. Tap to read it.

Chapter 5.7 · p. 656

Food that has to last the winter

The chapter's answer, in one sentence

“Stored vegetables are still alive, so slow them down without killing them. Cold slows their breathing, damp air stops them shrivelling, and fresh air carries off heat, gas and smells.”

What it corrects

“Our videos said a root cellar ‘stays at 40 °F’ all summer and that a stone springhouse ‘replaced your refrigerator.’ Neither holds up.” Eggs in water glass for nine months? “US extension food-safety specialists say don't.”

Where it stops. Storage indoors, in clamps and in the ground is Build it; a buried can in a hole no deeper than your knee is Build it carefully. Digging a walk-in root cellar is excavation: Plan it, hire it. Home canning in jars is outside this book.

Read next
  • 5.1The Year's Pantry p. 581
  • 5.7Cold Without a Fridge p. 656
  • 5.3Grains, Beans and Flour p. 605
  • 5.6Salt, Brine and Fermentation p. 643
p. 656, as printed. Tap to read it.

Chapter 1.1 · p. 63

Tools and hardware that rust

The chapter's answer, in one sentence

“Rust needs a film of water on the metal, so keep the water off.”

What it corrects

“The honest answer: medieval iron rusted too.” And one of our videos said to oil iron while it glows dark red. The chapter: “Don't.”

Where it stops. Cleaning, oiling and waxing are Build it; the hot finishes are Build it carefully, because of fire and hot oil. The chapter also says to stop if the piece is an antique or heirloom of value, or iron from the ground or the sea.

Read next
  • 1.1Keeping Iron From Rusting p. 63
  • 1.2Restore Old Tools p. 80
  • 1.3Sharpen and Keep a Blade p. 93
  • 1.6Keeping Wood From Rotting p. 131

Read the first page of Chapter 1.1 below

p. 63, as printed. Tap to read it.

Chapter 3.6 · p. 449

Firewood that hisses, smokes or won't catch

A viewer, under our January 2026 firewood video: … why are you cutting green wood?!? …

The chapter's answer, in one sentence

“Cut in late winter, split within weeks into pieces no thicker than about 6 in (15 cm), stack it under a roof with open sides, and let the meter, not the calendar, tell you when it's below 20%.”

What it corrects

One of our videos said radial splitting dries firewood “up to 40% faster” and credited a federal lab. “We found no such study.” And girdling, killing a tree on the stump so it dries standing, is no longer taught: “This book doesn't.”

Where it stops. Bucking, splitting and stacking are Build it carefully, with the chainsaw and splitting steps behind Caution boxes. Felling a standing tree is a hard limit: Plan it, hire it.

Read next
  • 3.6Firewood: Cut, Split and Season It Right p. 449
  • 3.7A Firewood Store That Keeps Wood Dry p. 463
  • 3.8Other Fuels p. 476
  • 1.7Choose, Cut and Dry Building Timber p. 146
p. 451, Figure 3.6-A. Tap to read it.

Chapter 4.4 · p. 541

Water pooling by the house, or a wet basement

A viewer, under our May 2026 foundations video: Isn't it known as a French drain? … The chapter's answer: “Almost.”

The chapter's answer, in one sentence

“Keep water away from the house on the surface, in this order: catch the roof water, slope the ground away, give the runoff a path, and only then bury a pipe, always with an outlet lower than where the water starts.”

What it corrects

One video told you to slope the ground a quarter inch per foot away from the house. “That's too little.” For soil, the US model code asks for “6 inches of fall in the first 10 feet, more than double (IRC R401.3).”

Where it stops. Surface drainage is Build it. Trenches and dry wells are Build it carefully up to knee depth, dug from the surface; anything deeper is Plan it, hire it, “and no one from your household goes in.” Wells are dug, drilled and sealed by licensed contractors.

Read next
  • 4.1Read the Land p. 501
  • 4.4Drainage p. 541
  • 4.2Catch the Rain p. 515
  • 4.5Wells: Types, Risks and When to Hire p. 554
p. 541, as printed. Tap to read it.

Chapters 3.2 to 3.4 · p. 398

Thinking about a masonry stove or a Rumford fireplace

The chapter's answer, in one sentence

“Shrink the heat your house loses first, then choose the heat source that fits your climate, your house and the work you'll really do. Every fire you choose comes with a chimney to inspect, a permit to pull and a CO alarm to hang.”

What it corrects

We said some Russian stoves were fired “once or twice a week.” The chapter: “A masonry heater is fired once or twice a day (NRCan).” And a wood fire doesn't “cost nothing to run”: a medium-sized modern house heated only with wood burns “about 3 to 5 full cords a winter (NRCan).”

Where it stops. All three chapters are Plan it, hire it. Chapter 3.3: “A certified heater mason builds it under a permit. This chapter is the specification you check them against.”

Read next
  • 3.2Choose Your Heat p. 398
  • 3.3The Masonry Heater p. 411
  • 3.4The Rumford Fireplace p. 424
  • 3.1The Physics of Heat p. 386
p. 414, Figure 3.3-A. Tap to read it.

IILook inside

Turn the pages before you buy.

Real pages from the PDF, two at a time the way a PDF reader shows them (one at a time on a phone). Nothing here is a mockup. Use the arrows or swipe, and tap a page to read it full size.

pp.62–63of 911

Part 1 opens with Chapter 1.1Keeping iron from rusting starts from the question under the channel's most-watched video, and two corrections to our own videos.

24 of the 911 pages are shown here, plus four more in the guide above. They are pictures of the PDF, not retouched.

IIIHonest corrections

Where our own videos got it wrong, the book says so.

Most chapters open with the question viewers asked and any correction to what the channel said, before the first step. Four of those corrections, copied from the book:

A video title said it never rusted

“The honest answer: medieval iron rusted too. The pieces you see in museums and on old gates are the survivors.”

Chapter 1.1, Keeping Iron From Rusting · p. 63
A brick claim, backwards

“…It claimed modern hard-fired bricks are glass-brittle and ‘destroyed by the simple freeze-thaw cycle,’ while soft medieval bricks survive. That's backwards. Hard-burned bricks are the durable ones; soft, under-fired ones crumble when they freeze wet (BIA Technical Note 15).”

Chapter 2.12, Brick and Stone · p. 324
A story we couldn't find

“…our dugout video opened with a Ukrainian family in 1560, ‘monastery records,’ 21 winters and a house still standing. We can't find any of it.”

Chapter 2.14, Dig Down to Stay Warm · p. 349
Not even medieval

“…a Rumford is not medieval. It dates from 1796, and several of you said so in the comments.”

Chapter 3.4, The Rumford Fireplace · p. 424

62 of the 63 chapters end with a table called “Myths we're correcting.” Its first column usually reads “What you may have heard (including from us).”

IVThe three labels

Every chapter says on page one whether the job is yours.

Most of the book is understanding old methods, choosing the ones that fit your place, and careful work you can do yourself. A smaller part is work you plan and hand to a licensed professional. The label keeps the two apart.

27 chapters

Build it

Low risk for a careful reader with ordinary tools. Follow the steps and the checks.

41 chapters

Build it carefully

You can do it, but some steps carry real risk: heat and fire, quicklime, sharp and powered tools, food you preserve, height, digging. Those steps sit behind an orange Caution box and “Stop if” signs.

18 chapters

Plan it, hire it

Decision guide only. It helps you decide, specify and check the work, and tells you what to ask. It does not teach the build, on purpose.

Counted from the contents below. 22 chapters carry more than one label, because different parts of the job carry different risks, and they are counted under each.

The building chapters split on one question: who sleeps there?

Build it carefullyA garden wall, a planter, a tool shed, an outbuilding: nobody lives or sleeps in it.
Plan it, hire itA house, an addition, or anything someone sleeps in or that carries a building's load.

“If a project starts as a shed and later someone wants to sleep, work all day or park a car in it, it has crossed into Part 2.” (p. 4) So the rubble-trench chapter teaches the trench under a shed or a garden-wall base. For a house, it hands you what to ask the building department, the engineer and the builder, and nothing in that part is a build.

“A colour is not permission. A green chapter done carelessly can still hurt you. A red chapter is not a dare.”

How the marks inside the chapters read · p. 4
Page 3, as printed. Tap to read it.

A good manual tells you when not to do it yourself.

These limits are written into the chapters, not hidden in small print. For each one, the chapter helps you decide, write down what you want and check the work, and a licensed or certified professional does the job.

  • Houses, additions, and any wall or foundation that carries a floor or a roof people use.Chapters 2.6 to 2.10 and 2.15
  • Installing any stove, fireplace, masonry heater or chimney.Chapters 3.2, 3.3 and 3.4
  • Wells. They are dug, drilled and sealed by licensed contractors.Chapter 4.5
  • Digging deeper than your knee, walk-in root cellars and anything buried you'd go inside. Test holes stay at knee depth or are bored narrow from the surface, after you call 811.Chapters 2.1, 2.14, 4.4 and 5.7
  • Felling a standing tree.Chapters 1.7 and 3.6
  • Work on the roof surface, and any rain system that supplies drinking water.Chapters 2.13 and 4.2

180+

“Stop if” signs

The risky steps carry signs that mean you stop now, and every procedure ends with a Check. If the check fails, you stop.

Left out on purpose

Weapons, home canning in jars (botulism), and burning charcoal or open braziers inside a home (carbon monoxide) are not in the book. Chapter 7.7 says where to learn what a manual can't teach.

Counted in the PDF: 182 “Stop if:” signs in the chapters.

VRead a chapter opening

Chapter 1.1, word for word.

The channel's most-watched video asked why medieval iron never rusted while yours dies in two years. This is how the book opens its answer, as text, at the size you'd read it. The notes in the margin show what every chapter does.

The Medieval Wisdom Builder's Manual

Chapter 1.1

Keeping Iron From Rusting: Oil, Wax, Tannin and the Blacksmith's Black

1The chapter number and title, as in the contents.

Build itBuild it carefully

CHAPTER TYPE. Build it for cleaning, oiling and waxing. Build it carefully for the hot finishes (Method E): fire and hot oil.

2The label, and what it means in this chapter. Some chapters carry two or three.

The question this chapter answers, and two honest corrections up front. The channel's most-watched video asked why medieval iron “never rusted” while yours dies in two years. The honest answer: medieval iron rusted too. The pieces you see in museums and on old gates are the survivors. They were oiled, waxed, painted and kept dry for centuries, and the ones that weren't are gone. The second correction: one of our videos said to oil iron while it glows dark red. Don't. Anything that glows is above roughly 525 °C (977 °F) and burns the oil straight off. The real blacksmith's finish goes on far cooler, with no glow at all. This chapter gives you the methods that actually work, matched to what you're protecting.

3The question, and what our own videos got wrong, fixed before the first step.

The idea in one sentence

Rust needs a film of water on the metal, so keep the water off. Control the air first (dry storage), then add the thinnest barrier that suits how the piece is used: oil for tools in your hand, wax for things you touch occasionally, tannin for old rusted hardware indoors, a hot black finish for iron you forge, paint for iron that lives outside, and seasoning for iron you cook in.

4The whole chapter in one line. Then why it works, what history shows, and a table to choose your method.

From Method B, Oil

Check: a drop of water on the surface beads up instead of spreading. When it spreads, re-oil.

5Every procedure ends with a Check you can see.

From Method E, the blacksmith's black

Caution: this is a fire job, and nobody has tested it. No standard or study covers this finish. The temperatures below come from one professional forge and from smiths' practice, not from testing, and no blacksmith has reviewed this section for this book. …

Stop if: the piece starts glowing; flames don't die out within a few seconds; your eyes sting from the smoke (move upwind); or the part might be galvanized. …

6Caution boxes sit on the risky steps and say so when something hasn't been tested. “Stop if” says when to quit.

From the end of the chapter

Myths we're correcting

What you may have heard (including from us)What the evidence says
Medieval iron never rustedIt rusted. Survivors were maintained, and the rest are gone.
Oil the iron at dark-red heatGlowing iron burns the oil off. Apply at a black heat, with no glow.
Bog iron is rustproof metalIt is high in phosphorus, valued for looks, and brittle cold. No proof it resists weather.
The Delhi pillar can't rustIts buried part rusted up to 15 mm deep.

7The claims that don't hold up, ours included. The sources are listed at the back, by chapter.

“…” marks text left out here. In the PDF this chapter starts on p. 63 and runs to p. 79.

VISeason by season

What needs doing this month, from the calendar in Chapter 7.6.

The book's “Year at a glance” (p. 822) lists the year's jobs from every part of the manual, month by month, with the chapter that teaches each one. It opens on this month.

The chapter is written for “a reference home: last spring freeze around the end of April, first fall freeze around mid-October, and a winter with hard freezes. If your dates differ, shift.” It shows how.

VIIThe 10 diagrams

Drawn for the book, one mechanism each.

Labeled parts, US units first. The manual itself is text, tables and these drawings: there are no photographs or AI images inside it. Tap any diagram to see it full size.

Fig. 2.2-A · p. 188The lime cycleThe further from quicklime, the safer to handle.
Fig. 2.6-A · p. 251A rubble trenchUnder a shed or a garden-wall base, with the steps' numbers.
Fig. 2.9-A · p. 291Rammed-earth formworkBoots, forms, ties and braces for a low wall.
Fig. 2.10-A · p. 304A cob wall's hat and bootsA coping that drips clear, a plinth against splash.
Fig. 2.13-A · p. 337How slate sheds waterStaggered joints and the headlap.
Fig. 3.3-A · p. 414A masonry heater, in conceptNot a design: a certified heater mason builds it.
Fig. 3.4-A · p. 429Reading a Rumford drawingWhat to check against the code table.
Fig. 3.6-A · p. 451Splitting, and a store that driesA covered single row, off the ground.
Fig. 6.5-A · p. 739Three of the ten knotsLoosened so you can follow the rope.
Fig. 6.5-B · p. 744The timber hitchHolds while pulled, falls off when slack.

VIIIContents

All 63 chapters, with each one's label and page.

Tap a part to open it. Two or three dots: a mixed chapter, with the label saying which part is which.

IllustrationPart 0Choose your taskHow to use the manual by need, sizing up your climate, land, budget, time and skill, why the old ways worked and where they don't, and safety on site.4 chaptersp. 12
  1. 0.1How to Use This Manual: Paths by Needp. 13
  2. 0.2Size Up Your Situation: Climate, Land, Budget, Time and Skillp. 25
  3. 0.3Why the Old Ways Worked, and Where They Don't Todayp. 36
  4. 0.4Safety in the Workshop and on Site: Protective Gear, Fire, Lime, Tools and Heightp. 47
IllustrationPart 1Workshop and materialsKeeping iron from rusting, old tools restored, sharpening, the lean kit, benchtop forging, keeping wood from rotting, timber, and pegged joints.8 chaptersp. 62
  1. 1.1Keeping Iron From Rusting: Oil, Wax, Tannin and the Blacksmith's Blackp. 63
  2. 1.2Restore Old Tools: Rust, Handles and Re-Haftingp. 80
  3. 1.3Sharpen and Keep a Blade: Stones, Strops and Anglesp. 93
  4. 1.4The Lean Kit: A Few Tools That Do the Work of Manyp. 105
  5. 1.5Benchtop Forging: What You Can Do at Home, and What You Can'tp. 117
  6. 1.6Keeping Wood From Rotting: Species, Detailing, Pine Tar, Oil and Charringp. 131
  7. 1.7Choose, Cut and Dry Building Timberp. 146
  8. 1.8Joints Without Nails: Pegged Joinery for Furniture and Garden Framesp. 160
IllustrationPart 2Build and protectStone, earth, timber or lime. Lime mortar and render, Roman concrete, the rubble trench, stone walls, rammed earth, cob, roofs, dugouts, and keeping an old house healthy.16 chaptersp. 173
  1. 2.1Choose Your System: Stone, Earth, Timber or Limep. 174
  2. 2.2Lime: Types, Quicklime vs Hydrated, Slaking and Safetyp. 186
  3. 2.3Lime Mortar and Breathable Renderp. 201
  4. 2.4Roman Concrete Today: What You Can Replicate, and What Forp. 216
  5. 2.5Roman Waterproofing: Opus Signinum for Small Basins and Floorsp. 230
  6. 2.6The Self-Draining Stone Foundation (Rubble Trench)p. 243
  7. 2.7Footings on Rock and Stone Masonry Wallsp. 257
  8. 2.8The Rubble-Core Wallp. 270
  9. 2.9Rammed Earth: Test the Soil, Build the Forms, Ram It Rightp. 283
  10. 2.10Wattle-and-Daub and Cobp. 297
  11. 2.11Warm Walls: Log, Straw, Wool, Turf and Moisture Controlp. 311
  12. 2.12Brick and Stone: Choose, Reuse and Lay a Low Garden Wallp. 324
  13. 2.13Roofs That Don't Leak: Thatch, Tile and Slatep. 336
  14. 2.14Dig Down to Stay Warm: Grubenhaus, Dugout and Zemlyankap. 349
  15. 2.15The Corbelled Dry-Stone Hut (Clochán)p. 361
  16. 2.16Keep an Old House Healthy: Limewash, Repointing and Wall Drainagep. 373
IllustrationPart 3Heat, cold and fuelThermal mass and draft, choosing your heat, the masonry heater, the Rumford, heating the person, firewood and a store that dries it, other fuels, keeping cool.9 chaptersp. 385
  1. 3.1The Physics of Heat: Thermal Mass, Stack Effect and Draftp. 386
  2. 3.2Choose Your Heat: Masonry Stove, Rumford, Wood Stove or Local Heatp. 398
  3. 3.3The Masonry Heater: Russian Pech, Kachelofen and the Modern Heat Batteryp. 411
  4. 3.4The Rumford Fireplace: Decide, Specify, Operatep. 424
  5. 3.5Heat the Person, Not the House: Layers, Warm Beds and Safe Local Heatp. 437
  6. 3.6Firewood: Cut, Split and Season It Rightp. 449
  7. 3.7Build a Firewood Store That Keeps Wood Dryp. 463
  8. 3.8Other Fuels: Pine Cones, Briquettes and Charcoalp. 476
  9. 3.9Keeping Cool the Old Way: Shade, Cross-Ventilation, Wind Catchers and Evaporative Coolingp. 488
IllustrationPart 4Water and landReading your land, catching rain, making water safe and its limits, swales and French drains, wells and when to hire, storing water.6 chaptersp. 500
  1. 4.1Read the Land: Runoff, Soil, Water Table and Wet Spotsp. 501
  2. 4.2Catch the Rain: Rainwater Harvesting at Homep. 515
  3. 4.3Make Water Safe: Slow Sand Filters, Boiling and Their Limitsp. 528
  4. 4.4Drainage: Swales, French Drains and Keeping Water Off Foundationsp. 541
  5. 4.5Wells: Types, Risks and When to Hirep. 554
  6. 4.6Store Water: Containers, Treatment and Rotationp. 567
IllustrationPart 5Food and preservationThe year's pantry, bread, grain and flour, acorns and wild foods, drying and smoking, salt and brine, cold without a fridge, fats that keep.8 chaptersp. 580
  1. 5.1The Year's Pantry: Planning What to Keep and Howp. 581
  2. 5.2Naturally Leavened Bread: Starter, Dough and Baking at Homep. 593
  3. 5.3Grains, Beans and Flour: Storing Without Losing Themp. 605
  4. 5.4Acorns and Wild Foods: Identify, Leach and Use Themp. 617
  5. 5.5Dry and Smoke Meat and Fish Safelyp. 630
  6. 5.6Salt, Brine and Fermentation: Sauerkraut, Pickles and Salted Foodsp. 643
  7. 5.7Cold Without a Fridge: Cool Rooms, Clamps, Buried Cans and Why Not Wood Ashp. 656
  8. 5.8Honey, Lard and Fats That Keepp. 669
IllustrationPart 6Cloth, leather and repairCloth that lasts, waxed and oiled cloth, leather care and repair, mending and darning, and the ten knots that do most of the work.5 chaptersp. 681
  1. 6.1Cloth That Lasts: Choosing Fibre and Weavep. 682
  2. 6.2Waterproof Cloth: Wax, Oil and Lanolinp. 695
  3. 6.3Leather: Clean, Feed, Stitch and Repairp. 707
  4. 6.4Mend and Darn: Clothing, Wool and Canvasp. 721
  5. 6.5Rope, Knots and Lashings: The Ten That Do Most of the Workp. 734
IllustrationPart 7Practical life and the fieldYour field kit, fire in the field, shelter and cold nights, water and food outdoors, ticks and pests, a season-by-season calendar, and what a manual can't replace.7 chaptersp. 750
  1. 7.1Build Your Field Kit: What to Carry, What It Weighs, and Why Skill Comes Firstp. 751
  2. 7.2Fire in the Field: Light It, Keep It, Put It Outp. 763
  3. 7.3Emergency Shelter and Cold Nights Outdoors: Stay Put, Get Off the Ground, Block the Windp. 775
  4. 7.4Water and Food in the Field: How Much, Where From, and How to Keep It Safep. 788
  5. 7.5Ticks, Mosquitoes and Pests: Old Methods and What the Evidence Supportsp. 800
  6. 7.6The Self-Reliant Year: A Season-by-Season Calendarp. 814
  7. 7.7What a Manual Can't Replace: First Aid, Hunting, Weapons and Trainingp. 826

Plus the 10 diagrams, 73 pages of sources by chapter (from p. 836) and a 3-page topic finder (p. 909). The part pictures in this list are illustrations made with AI; the book has none.

IXFrom the comments

Comments on the videos, not reviews of the book.

These were written under our videos before the manual existed. Some asked for it. Some told us where we were wrong. Under each one: where the manual picks up the thread.

Asked for it
“Stunning knowledge. Inspiring and empowering technology. Is there maybe a book in the making?”
A viewer, under our December 2025 video on dugouts

In the manual: 63 chapters. Chapter 2.14 covers dugouts, and corrects that video first. Of the family from 1560 it opened with: “We can't find any of it.”

Pushback
“… They only show buildings in areas that do not have bitterly cold winters and deep frost freeze. … So, Please do a video where you only talk about how these techniques work in areas of the world with real freeze/thaw cycles. …”
A viewer, under our December 2025 video on medieval foundations

In the manual: Chapter 0.2 has you get your frost line depth from the building department first, and Chapter 2.6 admits the trenches we praised were “about 16 inches deep, not below the frost line.” Under a house, it's Plan it, hire it.

Pushback
“… You said “for further reading”, but there is not a single link or book reference. It’s not really made to truly fact-check easily, almost looks intentional.”
A viewer, replying under our December 2025 video on dugouts

In the manual: Fair. Every chapter's sources are listed at the back, 73 pages of them, with the month we checked them.

Wants to build
“I really want to try this. I want to make a small, deeper one to serve as a root cellar and maybe later make a bigger one as a winter dwelling. It will be in the Scottish highlands and I will be borrowing my sister's digger and my nephew to dig the holes.”
A viewer, under our February 2026 video “What Was a Grubenhaus?”

In the manual: Chapter 2.14 is a decision guide on purpose. It “does not teach you to dig one to live in, because excavations collapse, earth roofs are heavy and any fire inside makes carbon monoxide.” Chapter 5.7 stores roots without a hole deeper than your knee.

Plans a house
“… I only know about it because I plan on building my house this way. I had to do the research myself of course”
A viewer, replying under our March 2026 Roman concrete video

In the manual: Chapter 2.4 is blunt: “Never use these mixes for foundations or structural work.” For a house, the book helps you plan and check, and a licensed pro builds.

Knows the craft
“I grew up helping my grandfather build "dry" stone walls. … Building a good wall requires looking at the stones and fitting them together so that everything locks together. It is training the eye and the brain to work with the hands. A good wall will last generations.”
A viewer, under our March 2026 video “What Was a Clochán?”

In the manual: Chapter 2.12 lays a low garden wall in brick or stone, and says where a wall becomes a pro's job. Chapter 2.15 covers the clochán itself.

Copied as written, typos included. These are excerpts from longer comments: “…” marks every cut, at the start, in the middle or at the end, and the words are never changed. We left names off; the month is when the video went up. Collected in June 2026. There are no reader reviews or star ratings here yet, because this edition is new and we won't make any up. The 30-day refund is how we carry that risk instead of you.

XFit check

Who it's for, and who should skip it.

It's for you if

  • You build or mend things with your hands, from a garden wall or a woodpile to a workbench or a pantry, and want to know which old methods are worth the effort.
  • You've watched Medieval Wisdom and wanted the quantities, the checks and the limits the videos leave out.
  • You'd rather know where your part stops and a licensed pro's begins before you start, not halfway through.
  • You want the history checked, including where the channel itself got it wrong.

Skip it if

  • You want house plans. Houses, foundations under a house, fires and chimneys inside a home, and wells are “Plan it, hire it”: the book helps you decide, specify and check, and a licensed pro builds.
  • You're after weapons, canning in jars or survival fantasy. Those are left out on purpose.
  • You want a promise about cost or results. Prices and codes vary by state and town; the book tells you what to recheck locally.
  • You need a bound book. This is a PDF. You can print the chapters you use.

XIAbout this edition

From a 107-page book to a 911-page manual.

  1. Earlier in 2026

    Build It Yourself

    14 building techniques107 pages

    Foundations, walls, Roman concrete, the masonry stove, the Rumford and firewood. It goes off sale when this edition launches.

  2. October 2026 · first edition

    The Builder's Manual

    63 chapters911 pages

    Those building methods rewritten and checked again, plus the workshop, heat and fuel, water and land, food, cloth and leather, and the field.

What this edition fixes from our earlier material

  • Lime: the water test for an unknown white powder is withdrawn, because quicklime can react violently. You identify lime by its label, standard and safety data sheet (Chapter 2.2).
  • The firewood store: the 2 to 3 in gap from the house wall is gone. The default store is detached, well away from the house (Chapter 3.7).
  • Bedrock: “12,000–20,000 psf” is replaced with the code's own figures, and an unsourced story about digging to rock is dropped (Chapter 2.7).
  • Trees: girdling, killing a tree on the stump so it dries standing, is no longer taught (Chapter 3.6).
Format
PDF, US Letter (8.5 × 11 in), clickable contents
Length
911 pages
Chapters
63, in 8 parts
Words
About 230,000 in the chapters
Type
12.5 pt body, set large for reading
Units
US first, metric in parentheses
Diagrams
10, drawn for the book. No photos or AI images inside
Topic finder
3 pages, from p. 909
Sources
73 pages, by chapter, checked October 2026 unless an entry says otherwise
File
About 16 MB
Review
No outside specialist reviewed this edition. The book says so on page 2, and says what it did instead.

Where it comes from

Sources you can look up, and a channel you can check.

Public agencies, university Extension services, building codes and standards, conservation institutes, manufacturers' safety data sheets and peer-reviewed research. Each chapter's sources are listed at the back with the month they were checked.

USDACDCEPAOSHANIOSHCPSCNFPAIRCASTMUSGSNPS Preservation BriefsHistoric EnglandExtension services

“No outside specialist has reviewed this edition. No engineer, mason, chimney professional, physician or food scientist read it before publication.”

Before you start: the fine print · p. 2

What it did instead, in the book's words: every number and every risky step was “checked against a source we actually read.” Where no source could be found, the claim came out, the job went to a professional, or the step got a Caution box and signs to stop. Where sources disagreed, the book uses the most conservative limit it found.

73 pages of sources, from p. 836. Tap to read it.
Medieval Wisdom logo

From the Medieval Wisdom channel

151K subscribers339 videosYouTube count, Oct 13, 2026

The chapters started from the videos and the questions in their comments, then went further: quantities, today's materials, safety and code, each checked against current sources. About the videos: the narration is a synthetic voice, and most scenes of people at work are AI-generated reconstructions. Watch on YouTube

Get the manual

The Medieval Wisdom Builder's Manual

$47then $67 after Oct 21 $67One payment

Launch price: $47 through Oct 21, 11:59 pm ET. After that it's $67. Same book, same 30-day refund.

  • 63 chapters in 8 parts: the workshop, building, heat and fuel, water and land, food, cloth and leather, and the field
  • 911-page PDF, US Letter, large 12.5 pt type, US units first
  • The label on every chapter, with Caution boxes, Checks and “Stop if” signs
  • 10 diagrams drawn for the book, and the season-by-season calendar
  • 73 pages of sources by chapter, dated, and a topic finder
  • Instant download, and a 30-day refund
Get the PDF · $47 · $67

Checkout on Gumroad, card or PayPal. No account needed.

How you get it

  1. Pay on Gumroad. Card or PayPal, guest checkout.
  2. Download the PDF. The link shows on screen as soon as you pay, and Gumroad emails it to you too.
  3. Read it or print it. On a tablet or computer, or print only the chapter you need. It opens on a phone too, but full pages are small there.

Read it, walk your place, decide.

Reply to your receipt within 30 days. Full refund, no forms. Keep every file.

Bought Build It Yourself?

Thank you for being one of the first readers. Whether you bought the book or the Complete set, this manual is yours free: on launch day it's added to your Gumroad purchase as an update, and we email you. You don't need to buy it again, and your original files stay yours.

Thank you for being one of the first readers. If you bought the Complete set, your upgrade is free. If you bought the book alone, you get a discount code. Watch the email you used on Gumroad. Your original files stay yours either way.

Questions

Straight answers.

How long is it, and what format?

A 911-page PDF (about 16 MB), US Letter, large type (12.5 pt body), with a clickable table of contents and a topic finder. First edition, October 2026. It reads best on a tablet or computer and prints well. It opens on a phone too, but full pages are small there. Units are US first, with metric in parentheses.

Do I need to be an experienced builder?

No. Chapters assume no trade background. Each one says up front what tools and skills it needs, and the “Plan it, hire it” chapters don't ask you to build anything.

Will these methods work in my climate?

That's what Part 0 and each chapter's “Choose your method” table are for. The book says where a method is the wrong choice for a site or a climate, and what to check locally: frost depth, soil and code. The calendar in Chapter 7.6 shifts to your own frost dates.

Will it teach me to build a house, a masonry stove or a well?

No, on purpose. Those chapters help you decide, write down what you want and check the work, and tell you what to ask a licensed or certified professional. The first page of every chapter says where your part stops.

Is this the same as Build It Yourself?

No. Build It Yourself covers 14 building techniques in 107 pages. This manual has 63 chapters in 911 pages: those building methods, rewritten and checked again, plus the workshop, heat and fuel, water and land, food, cloth and leather, and the field.

I bought Build It Yourself (or Complete). What about me?

You get this manual free. On launch day it's added to your Gumroad purchase as an update to what you bought, and we email you. Your original files stay yours.

If you bought Build It Yourself, Complete, your upgrade is free. If you bought the book alone, you get a discount. Watch the email you used on Gumroad for your code. Your original files stay yours either way.

Will the price go up?

Yes. The launch price of $47 ends on Oct 21, 11:59 pm ET. After that it's $67. Same book, same refund.

Where do the numbers come from?

Public agencies, Extension services, codes and standards, conservation institutes, safety data sheets and peer-reviewed research, listed by chapter at the back with the month we checked them. When a popular claim doesn't hold up, the chapter says so, including claims from our own videos.

Did an expert review it?

No, and the book says so on page 2: no engineer, mason, chimney professional, physician or food scientist read it before publication. That's why risky steps carry Caution boxes and “Stop if” signs, and why the riskiest jobs are “Plan it, hire it.”

Does the channel use AI?

Yes, in the videos: the narration is a synthetic voice, and most scenes of people at work are AI-generated reconstructions. On this page, the cover art, the part pictures in the contents and the winter farmhouse at the bottom are AI illustrations. The pages and diagrams shown here are taken from the manual itself, and the manual has no photos or AI images inside.

Do I need an account?

No. Guest checkout, and the download arrives by email.

What if it's not for me?

Reply to your receipt within 30 days. Full refund, no forms. Keep every file.

Read the label. Then build what's yours to build.

63 chapters, a label on every one, and the page that tells you when to stop.

Get the PDF · $47 · $67

Launch price through Oct 21, 11:59 pm ET, then $67.

30-day refund Instant PDF, yours to keep
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