Build hidden storage into your own house with a raised false floor, a removable panel in an inside wall, a closed void under the stairs or a false bottom in heavy furniture, and size it by the weight it adds to the floor as well as by the space it gives. Keep every compartment out of reach of chimneys and exits, and make sure no child can climb into a compartment and be trapped.
Part of Hidden Food Caches
Building integration is the construction of permanent hidden storage inside a dwelling, in floors, walls, stairs or furniture, that holds a small cache close to hand.
An In-House Cache Is Close, Dry And Easy To Reach
The parent article lists four ways to build permanent hidden storage into your own structure:
- False floors — raise a section of floor 15-20 cm on a frame, cover it with matching flooring, and use the void for flat containers.
- Wall cavities — between studs in framed walls there is typically 10-15 cm of space, accessed by a removable section of drywall or panelling.
- Under stairs — the triangular space is often wasted; build a concealed panel.
- Inside furniture — a heavy bench or cabinet with a false bottom, which moves with you if you relocate.
These are closer, drier and easier to rotate than a buried cache, and a household in its own building can check them without leaving the yard. Their weakness is that they are inside a place that is searched when a house is searched, so they suit a modest store, not the household’s only reserve.
What You Need
- Flat sealed containers — a standard 5-gallon bucket is taller than a 15-20 cm void; see Container Selection
- Structural knowledge — which joists and studs carry loads
- Matching finish — flooring, panelling or plaster that matches what is around it
- A lift-out or hidden catch that works without tools
Method: Check The Structure, Build The Void, Match The Finish
Step 1: Choose a location that is dry and inside the heated envelope. An inside wall or a floor over a dry space. An outside wall can collect condensation inside the cavity, and a floor over damp ground can wet the container; see Moisture Barriers.
Step 2: Do not cut load-bearing parts. Studs and joists carry the house. Work between them or add framing; do not notch joists or remove studs without replacing their function.
Step 3: Build the void to match the container, then add a lift-out panel. For a false floor, frame a small platform with its own joists and a lid that sits flush with the surrounding boards.
Step 4: Match the finish and the gaps. A panel that does not match the grain, nailing pattern or dirt of the surrounding surface is what a searcher sees. A little wear on a lid that has never been lifted is better than clean edges.
Step 5: Keep it clean. Seal food in containers inside the void. Loose food in a hidden space draws mice.
Step 6: Tell the household, including any older children and the people who would need it if you were injured.
Worked Example: Space And Weight In A False Floor
A void 15 cm deep (the parent article’s lower figure) under a 1 m² section of floor holds 0.15 m × 1.0 m² = 0.15 m³ = 150 L.
- At an assumed rice density of 0.8 kg per litre, which I am recalling and which you should check by weighing a measured litre of your own rice, that is 150 × 0.8 = 120 kg.
- The weight on the floor is 120 kg per m², or about 1.2 kN per m² (120 × 9.8 = 1,176 N).
- At a household ration of 0.55 kg of rice per person per day (from Inventory Management) for 4 people, 4 × 0.55 = 2.2 kg a day, so 120 ÷ 2.2 = 55 days of rice.
The void is not all usable, because containers do not fill it exactly, and the 120 kg is a load that your joists must carry in addition to the floor itself and people on it. If the joists are small or long-spanned, spread the load over more floor or use less. Do not assume.
Common Mistakes
- Loading a floor without checking the span. A false floor of rice is heavy.
- Putting the void beside the chimney. Heat, soot and fire risk; see the danger note.
- A hidden space that a child can climb into. It can trap and suffocate.
- Using the first place anyone would think of. An obvious hollow bench or cupboard is searched early.
Safety
Fire, collapse and entrapment
Keep false floors, wall voids and furniture caches away from chimneys, flues, stoves and wiring, and do not store flammables or fuel in them. A hidden space with a tight lid can trap a child who climbs in; make the lid openable from inside or keep the space too small and shallow to hold a child. A hidden compartment must never block an exit route or a window used for escape. Do not cut into a wall without knowing what is in it, since pipes and loaded studs are there.
What’s Next
- Learn next: Waterproofing and Preservation — what to put in the void
- Combine with: Misdirection — a decoy that makes a search stop early