Check door and window hardware each season: hinges and their fixings, latches, shutters and seals, and test every exit by hand each month, because an exit that sticks or needs a key is a fire hazard and a loose hinge fails a heavy door first. A 10 cm solid hardwood door of about 126 kg pulls on its top hinge with about 348 N, 2.9 times the 119 N of a plank door, so heavy doors need long fixings into the frame and a check of the top hinge first.
Part of Building Maintenance Schedules
Door and window hardware is the hinges, latches, bars, shutters and seals that open, close and secure a building’s openings, and the upkeep that keeps them working in a fire as well as in a storm.
Hardware Fails In Two Ways: It Jams Shut Or It Pulls Out
The maintenance guide asks in autumn that all window and door seals be checked, with gaps packed with wool, moss or caulk, and in mid-winter that fire exits remain functional and unblocked. Damp swells wood and rusts iron, so doors stick in wet seasons and hinges loosen as the wood around their screws rots. The two failures matter differently. A door that jams shut in a fire kills; a hinge that pulls out of the frame lets the door drop and lock itself. The defensive-architecture guide’s window shutters, thick wood or metal-lined and barred from inside, add weight and demand on their hinges (Defensive Architecture).
Worked Example: The Pull On A Top Hinge
A door hung on two hinges has its weight carried mostly by the lower hinge; the weight acting at the middle of the door’s width tries to rotate the door about the lower hinge, and the top hinge is pulled out of the frame. For a door of weight W and width w, with hinges a distance h apart, the horizontal pull on the top hinge is F = W × (w ÷ 2) ÷ h.
Inputs: door 0.9 m wide and 2.0 m high; hinges 1.6 m apart; dry hardwood density 700 kg/m³ and plank wood 600 kg/m³, both assumed (the wood guide gives no densities); the 10 cm thickness is the safe-room door of the defensive-architecture guide.
- Solid hardwood door, 10 cm: volume 0.10 × 0.9 × 2.0 = 0.18 m³; mass 0.18 × 700 = 126 kg; weight 126 × 9.81 = 1,236 N.
- Pull on the top hinge: 1,236 × 0.45 ÷ 1.6 = 348 N.
- Plank door, 4 cm: volume 0.04 × 0.9 × 2.0 = 0.072 m³; mass 0.072 × 600 = 43 kg; weight 424 N; pull 424 × 0.45 ÷ 1.6 = 119 N.
- Ratio: 348 ÷ 119 = 2.9.
A force of 348 N is the weight of about 35 kg hanging sideways from the hinge screws, concentrated into a few centimetres of frame. If the hinges were set 1.8 m apart the pull would fall to 1,236 × 0.45 ÷ 1.8 = 309 N: spacing hinges as far apart as the door allows is the cheapest improvement.
What You Need
- Spare hinges, pins, screws or nails and long fixings for heavy doors
- Grease or tallow for pins and catches, and a rag
- A plane and a rasp, for doors that stick
- Seals: wool, moss or caulk
- A list of exits, with the date each was last opened by hand
Method: Inspect And Test
Step 1: Open and close every door and shutter, feeling for rubbing, sagging and slop at the hinges.
Step 2: Check the top hinge first and the wood round its fixings: probe for softness.
Step 3: Tighten or replace fixings, moving to new wood if the old holes are worn.
Step 4: Plane or ease a sticking door at the point of rubbing and dress the cut edge with oil or paint.
Step 5: Grease pins and catches and wipe off the excess.
Step 6: Check seals and pack gaps.
Step 7: Test each exit under the real conditions: from inside, in the dark, with one movement and no key. Log the date.
Common Mistakes
- A heavy door on light hinges and short screws. The top hinge pulls out.
- Painting or sealing a door shut. Check it after every coat.
- A key kept somewhere safe. It is not in the lock when it is needed.
- A drop bar on the exit of a hall or workshop. A bar cannot be lifted against a crowd; any room holding more than a handful of people exits outward by pushing, with nothing to work first. Secure such a building from outside when it is empty.
Safety
The exit must open in one movement, from inside, with no key
A child in the dark should be able to open a dwelling’s door in a few seconds, and a crowd in a hall must be able to push its door open. Shutters barred for security need a quick-release from inside on at least one window of every sleeping room (Inner Hardened Zone). A door that has dropped on its hinges can jam: fix it before the winter, not after.
What’s Next
- Learn next: Community Maintenance Rotation — who does the checks
- Combine with: Controlled Access Points — the hardware of the settlement’s gates