A Draught-Proofing Checklist

A draught-proofing checklist turns a vague intention to seal a home into a room-by-room survey, so no opening is missed, no ventilation route is accidentally blocked and no seal is fitted to the wrong opening type. The checklist starts outside the home, with a windy-day walk that notes draughts at each window and door, at the loft hatch, at the cellar door, at service penetrations for pipes and cables, and at letterboxes, keyholes and cat flaps, and it continues inside, room by room, with a note for each opening of its type, its gap pattern, its closing and locking action, and whether it is a fire escape, a fire door or a room with a combustion appliance that needs permanent ventilation.

The checklist also records ventilation before any sealing, including trickle vents, extract fans, passive stacks and any mechanical system, with a note of whether each vent or fan is open, clean and working, or taped shut, painted over or switched off. That ventilation record is the safeguard that prevents the most common draught-proofing error, sealing a home so thoroughly that moisture, cooking smells and carbon dioxide build up, because the background ventilation that was previously provided by gaps has been removed without a deliberate replacement.

Working through the checklist room by room means, for each room, inspecting every window sash or casement, every external and internal door that borders an unheated space, the loft hatch if the room is below a loft, and any service penetrations, and then choosing a seal type for each opening: compression seals for casements and doors that close against a frame, brush strips for sliding sashes and door bottoms, groove-in seals for sash windows where a specialist fit is appropriate, and purpose-made seals for letterboxes, keyholes and cat flaps, rather than tape or foam that will fail quickly or block the opening. Gap size should be measured or estimated for each opening, since a seal that is too thick will prevent closing and locking, while a seal that is too thin will leave a gap, and both failures are common when seals are bought in bulk without measuring.

Each window and door should be tested for opening, closing and locking, for draught reduction on a windy day, and for whether trickle vents and fans still provide background ventilation, and any window or door that now requires force to close, or that no longer locks easily, should have its seal adjusted or replaced before the job is considered complete. A final check should also confirm that no fire door closer or intumescent strip has been interfered with, and that no combustion appliance room has lost its permanent ventilation opening.

A checklist that includes materials prevents the common pattern of sealing the easy openings, running out of the correct seal for the hard ones, and leaving the job half-finished.

In the EU, draught-proofing checklists and airtightness work follow national building regulations and renovation guidance, with member states differing on airtightness testing, on ventilation requirements after sealing and on product standards for seals. A checklist used in one country should therefore be adapted to local ventilation rules, especially where a home has a solid-fuel stove, an open fire or a gas appliance that relies on room air.

In the UK, Approved Document F sets ventilation expectations that interact directly with draught-proofing, Approved Document L covers airtightness, and fire safety rules govern seals on fire doors, with devolved building standards adding local detail. Those documents should be read alongside any checklist, so sealing work does not inadvertently breach ventilation or fire safety requirements.

A frequent checklist failure is working from memory rather than from a written list, so a back door, a loft hatch or a cellar door is missed while the front door is sealed twice over. Another is sealing trickle vents as if they were draughts, which removes background ventilation and creates condensation, when the checklist should have marked vents as do-not-seal from the start.

A third mistake is fitting seals without testing closing and locking, so a window that is sealed but cannot be locked, or a door that is sealed but cannot be opened easily in an emergency, is left as a security or safety problem. Testing each opening after sealing, and recording the test, prevents that outcome and proves the job was completed properly.

Keep the completed checklist with its photographs, seal types and test results, plus a note of any specialist work deferred and any ventilation advice given, in the home file. Those papers let a later occupant replace a worn seal with the correct type, and let a later tradesperson see which openings were sealed, which vents were preserved and which fire or combustion safeguards were noted.

Ask a qualified installer: will you work from a room-by-room checklist, which seal suits each opening type here, what ventilation remains after sealing, and how will each opening be tested for closing, locking and draught reduction. Checklist-based answers show draught-proofing done systematically, not by guesswork.