- You add
- A plastic tote instead of cardboard.
- You gain
- A waterproof shell that does not soften.
- Still limited
- No insulation; in winter only with straw and cover.
- New material
- Plastic storage tote
Design class: EmergencyValidation status: Data validated
Waterproof Emergency Shelter
A cardboard box wrapped outside with construction film or a heavy bag, raised on bricks and filled with straw. For an evening when nothing else is available; replace it as soon as it gets damp.
EMERGENCY ONLY
- It must stay dry.
- It must be raised off the ground.
- It is not a replacement for a durable waterproof shelter.
- Inspect it every day.
- Replace it as soon as it gets damp or deforms.
Capacity1
Outside size500 × 400
BuildNo skill needed
Time (estimate)20 min–40 min
This model has no 3D view; the drawing and dimensions below fully describe the construction.
Who this is for
- For someone who has to protect an animal tonight with whatever is at hand.
- For one cat, including community cats.
When not to use it
- As a permanent shelter: this is emergency-only and must be replaced as soon as possible.
- At a fully exposed spot: it needs shelter from wind and rain (a wall, fence or eaves).
- For young, old, sick or unacclimated animals without extra protection and supervision.
Tools and calculations
- Required tools
- Utility knife
- Budget class
- Free / reused
- Location
- Sheltered outdoor spot
- Supported calculations
- Geometry, Bill of materials, Cost estimate, Drawing, Build guide
Geometry
Dimensions
| Outside size (W × D) | 500 × 400 mm |
|---|---|
| Height front / rear | 350 / 350 mm |
| Raised off the ground | 100 mm |
| Entrance | 1 × 150 × 150 mm, sill 80 mm |
| Chambers | 1 |
| Geometry type | schematic envelope (assumption) |
Bill of materials · compiler output
What you have and what to obtain
Quantities come from the model geometry; items marked as assumptions are planning allowances. Reused material must pass the checklist.
Fill in “My workshop” to see what you still need to buy.
My workshopMaterialNeededOwnedStatus
Corrugated cardboard1 pcs–Buy
Waterproof sheet or heavy bag1.34 m²–Buy
Heavy-duty tape1 pack–Buy
Bricks5 pcs–Buy
Straw1 bale–Buy
- Corrugated cardboard1 pcsfrom geometry · A dry, clean container of a suitable size.
- Waterproof sheet or heavy bag1.34 m²from geometry · Wrap on the outside; never close the entrance with film.
- Heavy-duty tape1 packassumption · Tape on the outside only.
- Bricks5 pcsassumption · Four stable supports under the corners.
- Straw1 baleassumption · Loosely to a quarter or half of the height; keep the rest dry for refills.
Water and moisture
Weather exposure
A warm shelter that gets damp can be worse than a simpler one that stays dry. This is an explanation, not a condensation calculation.
- Ground contactRaised about 100 mm off the ground.
- Rain splashHigh enough that rain splash from the ground does not hit the floor.
- Roof drainageThe lid is flat: water runs off to the sides. It must close well and the entrance must not sit below a drip edge.
- Rain at the entranceThe entrance sill is 80 mm above the floor.
- DryingWithout a service opening drying and cleaning are harder; change bedding through the entrance.
- Absorbent materialThe material absorbs moisture; check it more often and replace it when damp.
- Maintenance accessAccess for checks and cleaning is simple.
Placement
Check the spot
No obvious issue detected
This is not a safety certificate for the spot: it only means none of the listed questions is ticked.
Bedding
What goes inside
- RecommendedStrawRepels moisture and stays loose. Replace when damp, compacted or soiled, and when seasons change.
- Not recommendedHaySoaks up moisture, turns cold and can mould. If already in a shelter, replace it with straw.
- Not recommendedBlanketAbsorbs and holds moisture; a damp blanket chills. Wash and swap as soon as it is damp.
- Not recommendedTowelAbsorbs moisture like a blanket. Wash and swap as soon as it is damp.
- Not recommendedWood shavingsPartly absorbs moisture. Change when damp or compacted.
- Not recommendedWashable dog bedDepends on fabric; textile absorbs moisture. Dry or swap as soon as it is damp.
- Not recommendedNo beddingNothing to absorb moisture. Not applicable.
Maintenance
Inspection schedule
- DailyCheck that the straw is dry and loose; replace it when damp or compacted.
- DailyCheck for water or dampness on the floor and walls, especially under the entrance.
- After stormsAfter rain or snow check the interior and the ground under the shelter.
- DailyReplace cardboard immediately if it is soft, damp or deformed.
- After stormsClear snow from entrances and exits so the animal cannot be snowed in.
- WeeklyClean the interior; service access must allow cleaning without dismantling.
Upgrade path
Where to go next
Each step states what you add, what you gain and what stays limited. A new model has a new plan ID; changing an existing build has no canonical plan.
Previous step: Emergency Cardboard Dry
Build sequence
Build steps
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Prepare the container
Take a dry, clean corrugated cardboard. Close and secure the sides so the box cannot open.
Cut the entrance
Cut a 150 mm × 150 mm opening through corrugated cardboard, with the sill 80 mm above the floor so rain and snow stay out. Face the entrance away from the prevailing wind. Cover or sand sharp edges.
Wrap the outside, keep the entrance open
Cover the roof and walls with film or a heavy bag and tape it on the outside. The film must not be inside and must never close the entrance; keep the lower edge of the entrance free because of condensation.
Raise the shelter off the ground
Set the shelter on four stable bricks, about 100 mm above the ground, so the floor does not touch cold, wet ground. Check that it does not rock.
Add straw, not hay
Loosely fill straw to a quarter or half of the interior height. Do not use hay, towels or blankets in an outdoor winter shelter: they absorb moisture and chill.
Choose the spot and secure it
Set it against a wall or fence, out of the wind, away from roof runoff and roaming dogs. Weight or secure lightweight shelters. Check the spot with the placement checklist.
Check every day
This is an emergency solution only. Check daily that it is dry; as soon as the cardboard gets damp or deforms, replace it. Move to a durable waterproof shelter as soon as possible.
Provenance
Sources and verification status
A source supports a guideline or material value, but it does not confirm this specific model. Container sizes are assumptions and build time is a planning estimate.
- Data validatedcurrent
- Geometry validatednot confirmed
- Engineering reviewnot confirmed
- Physical prototypenot confirmed
- Field validationnot confirmed
ASPCApro · Tier 1Winter Shelters for Community Cats: FAQs and Cold Weather TipsSupports small insulated shelters, cat-sized entrances, elevation from wet ground, straw bedding and predator-aware entrance decisions.Alley Cat Allies · Tier 1Straw, not Hay, for Outdoor Cat SheltersStraw repels moisture while hay soaks it up and can mold. Loosely pack straw to the quarter or halfway point; store spare straw dry and off the ground.