๐ Guides โบ ๐ Shelter & building ยท ๐ Emergency ยท ๐ Index AโZ
The best shelter you will ever have is the house you already live in โ if you keep the water out. This guide covers keeping an existing house sound (roof leaks, flashing, gutters, rot and insects), heating one warm room, reglazing windows, durable local woods, hand-tool carpentry, splitting your own shakes, drying lumber, log and earth building, chimneys, earthquake and wildfire hardening, and emergency tarp shelters. The books are in Shelter-Building\ (House-Repair, Carpentry-Timber, Earth-Natural-Building, Wildfire-Quake-Hardening). Hand tools and saws are in Blacksmithing-Tools\Hand-Tools; quake and fire guides are in Earthquake-Tsunami\ and Wildfire\; cob, straw bale, light straw-clay, hempcrete, earth and lime plasters, making lime and thatch are in the Natural Building guide and Natural-Building\.
โ ๏ธ Rules that prevent the worst outcomes
- Roof work kills. Use scaffolds, ladders or a safety rope (USDA FB 1751, p. 24). Never work on a wet or mossy roof, or alone (rule of thumb).
- Old houses hold lead paint (before 1978) and asbestos (old shingles, siding, pipe wrap). Don't sand, cut, heat or burn them. Scrape paint wet and keep children away (rule of thumb).
- Carbon monoxide. Any fuel heater without a chimney needs an open window โ 1 sq in per 1,000 Btu (MSU E-1669, p. 3). Keep a battery CO alarm by the beds.
- Cascadia will shake hard. Brick chimneys were damaged in most big U.S. quakes (FEMA 232, p. 144), and heavy unreinforced earth walls can collapse. Build light, keep earth walls low and single-story, and bolt the house to its foundation (FEMA 232, p. 168).
- Wildfire comes as embers. Screen vents with 1/8-in metal mesh, keep gutters clear, and keep firewood 30 ft from the house (OSFM, p. 8; FEMA P-737, p. 23).
- Never use the old poisons the old bulletins recommend โ DDT, arsenic, pentachlorophenol, coal-tar creosote. See the last section.
Inspect the roof regularly for breaks, missing shingles, choked gutters and damaged flashing (USDA FB 1751, p. 22) โ every fall before the rains, and after big storms (rule of thumb).
Finding the leak (p. 22):
Emergency patches:
Illinois Valley: our wet winters grow moss and lichen on roofs, and overhanging branches keep shingles wet. Both shorten a wood roof's life (NPS Brief 19, p. 6). Cut back limbs over the roof โ that helps in fire season too.
๐ Go deeper: USDA FB 1751 Roof Coverings for Farm Buildings โ finding leaks and repairing every kind of roof; FM 5-426 Carpentry โ roofing and flashing details. Pictures: scaffolds for roof work, FB 1751 p. 13, Roof shingle.
Roofs leak most where two surfaces meet: valleys, chimneys, dormers and walls. Flash these with galvanized or copper sheet (FM 5-426, p. 119; valleys at p. 124; valley flashing drawings (ignore its red-lead paint); chimney flashing). Flashing over window and door heads should run at least 4 in up behind the siding above the drip cap (USDA AH 73, p. 163; where flashing goes).
Base flashings under the shingles, cap flashings in the mortar joints lapping over them, and a cricket to shed water behind the chimney (USDA FB 1889, p. 12).
Move the water away from the house (AH 73, pp. 8โ9, 169):
๐ Go deeper: USDA Wood-Frame House Construction (AH 73) โ illustrated flashing, gutters, foundations and crawl spaces; FM 5-426 โ valley flashing. Pictures: Flashing, Rain gutter, gutters and downspouts, AH 73 p. 168, eaves troughs and downspout fittings, FB 1751 p. 31.
With little fuel, heat one room, not the house. The relief-shelter order of priorities in winter (IFRC/Oxfam Plastic Sheeting, p. 30):
Seal the drafts (HUD, In the Bank or Up the Chimney, pp. 36โ37; caulking drawings):
Plastic storm windows (HUD, p. 42): tape clear plastic over the inside of the window frame (easier, and it lasts longer), or tack it outside with 1/4 ร 1 1/4 in wood slats. Pull it tight and trim the extra.
Heaters without a chimney make carbon monoxide. Leave 1 sq in of open window for every 1,000 Btu of heater output. A 9,100-Btu heater in a room with a 24-in window means opening it almost 1/2 in (MSU E-1669, p. 3).
No fuel at all? Insulate the people: towels, paper bags and layers of newspaper held under old raincoats and shirts (Kearny, p. 130).
๐ Go deeper: HUD In the Bank or Up the Chimney โ caulking, weatherstripping and insulation, step by step; IFRC/Oxfam Plastic Sheeting โ warm rooms in winter; CMHC wood-heating guide โ stove and pipe safety. Pictures: weatherstripping types, HUD p. 38, Weatherstripping, Kerosene heater.
โ ๏ธ Paint on windows made before 1978 almost certainly contains lead. Don't sand it dry or heat it until it scorches. Scrape it wet, collect the chips, and keep children away (rule of thumb).
Replacing a pane (NPS Brief 9, p. 5; window parts named):
Where window rot starts: the sill, the sill-to-jamb joints, the bottom-rail corners and the muntin (glass-bar) joints โ wherever water sits. The sill must slope outward. Cracked putty lets water soak the joints (NPS Brief 9, p. 2).
Saving partly rotted wood: let it dry, brush on 2โ3 coats of boiled linseed oil, 24 hours apart, fill cracks with putty, then paint (p. 5). Rags soaked in linseed oil can catch fire by themselves โ dry them spread flat outdoors or keep them in a can of water (rule of thumb).
๐ Go deeper: NPS Preservation Brief 9 โ reglazing, sash cords, weatherstripping and sill repair. Pictures: Putty, Sash window, Putty knife.
Dry wood does not rot. Decay needs wood wetter than about 30% moisture. Air-dried wood is at or below 20%, and decay already in the wood stops if it's kept dry (Wood Handbook, p. 314; rot fungi).
What rots houses and draws termites (USDA FB 1993, p. 7): wet, unventilated crawl spaces; scrap wood left on the soil; wood touching soil (especially dirt-filled porches); wood buried in masonry near the ground; no gutters or roof overhang; roof and plumbing leaks.
The fixes (FB 1993, p. 3): no wood touching soil, an 18-in crawl space, vents on opposite sides (or roll roofing laid over the soil), and an inspection every winter or early spring. Termites build earthen tubes up foundations (photo): break them, and block the route with mortar or pitch.
Carpenter ants (USFS R10-TP-128, pp. 4, 7; winged ants):
Which woods last (heartwood only; Wood Handbook, Table 14-1, p. 316):
| Decay resistance | Western species |
|---|---|
| Very resistant | Pacific yew |
| Resistant | Port-Orford-cedar, incense-cedar, western redcedar, junipers, white oaks, old-growth redwood |
| Moderately resistant | Douglas-fir, western larch |
| Slightly or not resistant | True firs, hemlocks, red alder, maples, tanoak, cottonwood, most pines |
Locally, Port-Orford-cedar and incense-cedar grow in the valley and the Siskiyous. Use their heartwood for sills, posts, shakes and anything touching the ground. Port-Orford-cedar killed by root disease still has sound, durable heartwood (rule of thumb).
๐ Go deeper: USDA FB 1993 Decay and Termite Damage in Houses โ spotting decay and termite tubes (ignore its poisons); Wood Handbook ch. 14 โ decay, insects and durable species; USFS Carpenter Ants โ finding the nest. Pictures: Carpenter ant, Termite, Wood-decay fungus, termite or winged ant? FB 1993 p. 5.
Square a corner with 6-8-10 (FM 5-426, p. 48; the same idea with 3-4-5):
6 ft one way, 8 ft the other, exactly 10 ft across; then check that the diagonals match (a diagram drawn for this guide).
Handsaw basics (Disston, p. 10): start on the waste side of the line with your thumb against the blade, and draw back a few times to make a groove. Crosscut at about 45ยฐ to the board with full-length strokes. Support the waste piece so it doesn't splinter off.
Hewing a log flat (An Ax to Grind, p. 52): hew green, freshly cut logs โ dry logs hew badly. Set the log on V-notched yokes about knee high. Snap a chalk line, score down to it with a single-bit axe, then flatten with a broadaxe (step-by-step drawings).
Roofs and joints: rafter lengths by the step-off method (FM 5-426, p. 108) or the steel square (Brace and Mayne, p. 199; rafter pitch); mortise-and-tenon joints (Griffith, p. 105; drawing).
Air-drying lumber (OCHA/IFRC/CARE Timber, pp. 45, 68):
Wood shrinks most along the growth rings, about half as much across them, and hardly at all along its length (Wood Handbook, p. 84). Green wood opens gaps as it dries.
๐ Go deeper: FM 5-426 Carpentry โ layout, framing, rafters and roofing; USFS Handtools for Trail Work, p. 46 โ adzes and broadaxes; Timber in Humanitarian Operations โ felling, drying and joining timber. Pictures: Broadaxe, Hewing, Adze, Wood drying, air-drying yard, Wood Handbook p. 317.
Splitting (NPS Brief 19, p. 2):
If a split runs off to one side, start again from the other end of the billet and split back to meet it (Beard, p. 115).
Laying wood shingles (USDA FB 1751, pp. 6โ7) on a roof of 1/4 pitch or steeper (flatter roofs are hard to keep tight):
| Shingle length | Show to the weather |
|---|---|
| 16 in | 5 in |
| 18 in | 5 1/2 in |
| 24 in | 7 1/2 in |
For our wet winters, nail shingles to spaced 1ร4 slats (spaced the same as the exposure) instead of solid boards. Air reaches the underside so they dry out, and it takes less lumber (FB 1751, p. 6). A cedar roof on raised, ventilated battens lasted over 60 years in a harsh, wet climate (NPS Brief 19, p. 4).
Exposure, joints, nails and spaced slats for 16-in shingles (a diagram drawn for this guide).
๐ Go deeper: NPS Preservation Brief 19 โ hand-split shingles and why wood roofs fail; Beard Shelters, Shacks and Shanties โ shakes and clapboards with only an axe. Pictures: Wood shingle, Shaving horse, shingles on slats, FB 1751 p. 6, hips and ridges, p. 7, historic roof details chart, NPS Brief 19 p. 5.
Cutting the logs (USDA FB 1660, pp. 5โ6):
Foundations:
Notching: the common corner notches โ saddle, V, dovetail, square โ are drawn in NPS Brief 26, p. 5 and FB 1660, p. 12. Notches that cup upward hold rain and rot first (Brief 26, p. 9), so cut the notch in the underside of the upper log (rule of thumb).
The common corner notches (NPS Brief 26, p. 5).
Chinking and daubing (NPS Brief 26, pp. 6, 12โ13; methods drawn) โ three layers:
Drawing (b) is the three-layer method above: blocking, soft packing, then daub (NPS Brief 26, p. 13).
Daubing is the least durable part of a log building. Patching it is a seasonal chore (p. 12). Delay chinking as long as you can so the logs dry first (FB 1660, p. 12), and fit doors and windows only after the logs have shrunk (Wood Handbook, p. 84).
๐ Go deeper: Wicks Log Cabins and Cottages โ a cabin step by step; USDA FB 1660 Logs and Poles โ notching, chinking and pole buildings; NPS Brief 26 โ repairing rotted logs and daubing mixes. Pictures: Log cabin, Chinking, Log building, log-hewing tools, NPS Brief 26 p. 5.
โ ๏ธ Heavy, unreinforced earth walls can collapse in a big quake. The Peace Corps handbook calls for steel reinforcement in footings and walls in earthquake areas (Building Homes of Earth, pp. 70โ75). In southern Oregon, keep earth walls low, light and single-story, or use earth only as infill or inside walls within a braced wood frame (rule of thumb).
Ribbon test for building soil (Building Homes of Earth, pp. 24โ25; drawing): roll damp soil into a cigar shape and squeeze it out between thumb and finger into a ribbon.
| Ribbon length | What it means |
|---|---|
| 8โ10 in | Lots of clay โ walls last only if you stabilize or temper it |
| 2โ4 in | Medium clay โ often good |
| No ribbon | Too little clay |
| Springs back like a sponge | Organic topsoil โ unusable |
Adobe bricks (USDA FB 1720, pp. 9โ10):
Adobe works in wet climates only if the walls are kept dry and the site never floods (p. 3) โ so give it wide eaves and a raised foundation.
Rammed earth (USDA FB 1500, pp. 9, 11โ12):
Cob, straw bale, light straw-clay, hempcrete, earth and lime plasters: see the Natural Building guide.
๐ Go deeper: Peace Corps Handbook for Building Homes of Earth โ soil tests, blocks, footings and roofs; USDA FB 1720 Adobe โ mixing, curing and plasters; USDA FB 1500 Rammed Earth โ forms and rammers. Pictures: Adobe, Rammed earth, adobe footings, FB 1720 p. 13, rammed-earth forms, Peace Corps p. 120.
Building or checking a masonry chimney (USDA FB 1889; whole-chimney diagram):
How high the chimney must rise above the roof (a diagram drawn for this guide).
Single-wall stovepipe needs 18 in from anything that burns; only proper shielding allows less (CMHC, p. 36).
Repointing loose chimney mortar: rake it out and refill with 1 part portland cement, 1 part lime and 6 parts sand (FB 1751, p. 24). When cement runs out, use lime and sand, about 1:3 โ and keep hard cement off soft old brick (rule of thumb).
Cleaning and chimney fires: see the Firewood guide.
๐ Go deeper: USDA FB 1889 Fireplaces and Chimneys โ flues, footings, clearances and cleanouts; CMHC Guide to Residential Wood Heating โ current clearances. Pictures: Chimney, soot pocket and cleanout, FB 1889 p. 9 (ignore its asbestos insulation).
Earthquake (FEMA 232):
Sill bolts with steel plate washers, and plywood nailed over the cripple-wall studs (FEMA 232, p. 171).
Wildfire โ embers cause up to 90% of house ignitions and can fly miles ahead of a fire (OSFM, p. 5). They blow into vents and light the debris in gutters (FEMA P-737, p. 13):
๐ Go deeper: FEMA 232 ch. 9 โ retrofitting existing houses; Living on Shaky Ground โ Oregon's checklist; FEMA P-737 โ vents, roofs, decks, windows and siding; Oregon Home Hardening Guide. Pictures: Seismic retrofit, Ember, chimney quake damage, FEMA 232 p. 144, gutter debris and leaf guards, FEMA P-737 p. 45.
๐ฅ More on embers, vents, clearing and defending the house: the Wildfire guide.
Fixing plastic so it doesn't tear (IFRC/Oxfam Plastic Sheeting, p. 26):
Keep it tight and sloped (p. 29): a loose sheet flaps in the wind and holds puddles, and both tear it. Keep nail heads flush, smooth anything that touches the plastic, and keep branches and hot metal (stovepipes) away.
Tarping a damaged roof (rule of thumb): run the tarp over the ridge so rain can't get under its top edge, and hold it down with battens nailed through it, not with nails alone.
Out in the open: a poncho lean-to needs only a poncho, 2โ3 m of cord, three stakes and two trees (FM 21-76, p. 49; drawing). For fallout shelters, see the Nuclear Fallout guide.
๐ Go deeper: IFRC/Oxfam Plastic Sheeting โ fixing, repairs and warm rooms; Beard โ bark and brush lean-tos up to pole houses; Kearny Expedient Shelter Handbook โ quickly built earth-covered shelters.
๐ Go deeper: Wood Handbook ch. 14 โ durable species instead of poisons; Oregon Home Hardening Guide โ current vent rules.
Look before you try it. ๐ผ๏ธ = drawings in the books on this drive; ๐ท = photos in the offline Wikipedia.
Roofs, flashing and gutters
Drafts and windows
Rot and insects
Carpentry, hewing and shingles
Log and earth buildings
Chimneys, quakes, fire and tarps