Shelter

Build an A-frame emergency shelter

An A-frame emergency shelter is a low ridgepole frame covered with thick natural debris, with two sloping sides that shed rain. You use it when you need protection from wind and weather and have enough suitable wood and dry insulating material nearby. Keep the interior just large enough for you to lie inside: the debris traps insulating air, while thick bedding limits heat loss to the ground; loose thatch is not reliably waterproof in prolonged rain. Never run an open flame inside an enclosed A-frame — this is a body-heat shelter only.

Shelter 45 min practice Intermediate Choose sheltered, well-drained ground with abundant fallen wood and dry leaves or grass, away from drainage channels, flood areas, dead overhead branches, and unstable trees. This shelter is most practical in wooded terrain; wet debris, sparse materials, strong winds, or heavy snow make it a poor choice.

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Topic summary

Key takeaways

The ridgepole and supports stay seated during a gentle stability check from outside.
The roof has continuous, deep coverage across both slopes, the ridge, and the closed end, with no visible gaps.
Your hips and shoulders remain cushioned above the ground when you lie on the bedding.
You fit inside without pressing against the roof, feel little direct draft, and can clear the entrance easily.
Avoid: Making the shelter tall or wide leaves excess space to warm, so size the interior around your lying position and bedding.
Avoid: Using rotten poles or an unsecured front support risks collapse, so choose sound wood and brace the frame before covering it.

Intended uses

Shelter skill (Intermediate, ~45 min practice)
Requires: Work gloves for handling rough wood and debris, Optional pruning saw for trimming sound fallen wood

Climate suitability

Choose sheltered, well-drained ground with abundant fallen wood and dry leaves or grass, away from drainage channels, flood areas, dead overhead branches, and unstable trees. This shelter is most practical in wooded terrain; wet debris, sparse materials, strong winds, or heavy snow make it a poor choice.

Safety: Check your site for overhead hazards and signs of flooding before you build, and inspect debris for sharp objects, insects, and animal waste. Brace the forked support and test the frame gently from outside before loading it with thatch or getting underneath it.

Required tools

Work gloves for handling rough wood and debris
Optional pruning saw for trimming sound fallen wood

Required materials

Sound ridgepole and stout forked support stick
Straight rib poles and finger-thick lattice sticks
Cordage for securing and bracing joints
Abundant leaves, grass, or fallen boughs for thatching
Dry, loose debris for bedding and interior insulation

Step-by-step

Lash or wedge a ridgepole between a low tree fork and a shorter forked stick driven into the ground.
Why: Lashing or wedging the ridgepole into secure forks establishes the load-bearing spine and keeps the sleeping space low and compact. Drive the shorter forked stick into firm ground and brace it against movement so the ridgepole cannot roll or slip out.
Lean pairs of ribs against the ridgepole from both sides, angled at about 45°, spaced a hand-width apart.
Why: Paired ribs at about 45° create two sloping roof faces that encourage water to run outward while leaving room beneath the ridge. Hand-width spacing supports the covering without leaving large gaps, and balanced placement reduces sideways loading on the frame.
Add a horizontal lattice of finger-thick sticks over the ribs.
Why: A horizontal lattice catches loose thatch and spreads its weight across the ribs. Secure sticks that tend to roll or slide so the covering stays in place.
Thatch heavily with leaves, boughs, or grass — at least a forearm-thick layer to shed rain and hold heat.
Why: A thick, continuous covering traps insulating air and slows rain penetration; treat a forearm-thick layer as a minimum rather than a guarantee of dryness. Build from the lower edges upward, overlapping material toward the ridge, and add more wherever gaps or thin spots remain.
Stuff the interior with dry debris to sleep on and pack extra debris against your body once inside.
Why: Deep, dry bedding separates your body from the cold ground and must remain thick after your weight compresses it. Loose debris around your body reduces drafts and empty air space, but keep your face clear and the entrance easy to open.

Common mistakes

Making the shelter tall or wide leaves excess space to warm, so size the interior around your lying position and bedding.
Using rotten poles or an unsecured front support risks collapse, so choose sound wood and brace the frame before covering it.
Leaving the ridge, ends, or lower edges thin lets wind and rain through, so cover these areas continuously and overlap thatch from the bottom upward.
Laying only a thin bed leaves you against cold ground after it compresses, so test the bedding under your weight and add more dry material.
Using up your time on the frame leaves insufficient time for insulation, so build a simple compact frame and reserve most of your gathering effort for bedding and thatch.

Troubleshooting

If the ridgepole shifts or the forked support leans, then stay out and reseat, lash, or brace the supports before adding more weight.
If daylight shows through the roof or rain drips inside, then add overlapping thatch outside the thin areas and ridge; seek more reliable cover if rain continues to penetrate.
If you feel cold beneath you, then increase the dry bedding until it remains a substantial cushion under your hips and shoulders.
If wind blows through the entrance, then narrow it with secured debris or a removable debris-filled panel while leaving breathing space and a clear exit.

Field practice drill

In safe weather, spend about 45 minutes building a compact practice shelter where gathering materials is permitted. Check the site, build and test the frame, then add thatch and bedding; lie inside briefly to check fit, drafts, and compressed bedding depth. Treat this as practice rather than a guaranteed completion time, and repeat with attention to any weak spots before dismantling the shelter and scattering materials responsibly.

Indicators of success

The ridgepole and supports stay seated during a gentle stability check from outside.
The roof has continuous, deep coverage across both slopes, the ridge, and the closed end, with no visible gaps.
Your hips and shoulders remain cushioned above the ground when you lie on the bedding.
You fit inside without pressing against the roof, feel little direct draft, and can clear the entrance easily.

Related outdoor skills

Educational reference only. Wilderness conditions change fast — practice in low-stakes settings, take a certified wilderness first-aid course, and confirm regional regulations before you rely on any of these skills in the field.