Age and type of house
Downlighters have cut the vapour-control layer of a timber frame and the cuts were seen from the loft. What airtightness test was not carried out?
An airtightness test was not carried out. From the loft, the survey saw that downlighters have cut the vapour-control layer of the timber frame. Those cuts were visible. A test of how airtight the house is was not. The inspection has recorded holes in the layer. It has not measured air leakage, not pressure-tested the dwelling, and not decided how much the cuts matter in figures. Seeing a cut is not a fan test.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
A vapour-control layer is there to limit moisture and air moving through the frame. Downlighters that puncture it leave a hole for each lamp, and from the loft those holes can be obvious. What the survey cannot do from that view is measure the leakage of the whole house, or say the cuts are the only gaps. Other penetrations may be hidden. The note should stay with the cuts that were seen and with the test that was not done.
If the frame's vapour control matters to you, ask a timber-frame or building specialist about the cuts, and keep any airtightness test as a separate commission. Tell the solicitor the survey saw the cuts from the loft and did not test airtightness. Do not describe the house as failed or as fine on air leakage. The report has no such test. The finding is the cut layer.
What should you ask your surveyor?
- Which cuts in the vapour-control layer did you see from the loft?
- Was an airtightness test outside this inspection?
- Have you recorded the holes without measuring leakage?
What are the typical next steps?
- Treat the loft note as cuts that were seen, not as an airtightness test.
- Ask a specialist what the punctured layer means for the frame.
- Commission an airtightness test only if you need that measurement.
Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.
Also asked about this
If the lamps have hoods, has the layer been repaired?
Not necessarily. A hood over a lamp is a cover you may see. It is not proof the vapour-control layer was sealed, and it is not an airtightness test. The survey saw cuts from the loft. Hoods, if present, were not a pressure result and were not reported as a repair of the layer.
Does one neat cut mean the rest of the ceiling is intact?
The survey saw the cuts that were visible from the loft. It has not inspected every penetration and has not tested the ceiling. One described hole does not clear the ones that were boarded over or out of sight. Airtightness remains untested.