Roofs and flat roofs
Loft insulation is stuffed tight into the eaves and the cold-roof gap is gone. What ventilation path has that blocked?
Stuffing the insulation into the eaves has blocked the cold-roof ventilation path at the intake. On a cold roof, air is meant to enter at the eaves, pass through a gap above the insulation, and move along under the covering. When the quilt is packed tight, that gap is gone and the intake cannot feed the loft. The survey has seen the blocked eaves. It has not measured condensation, has not measured airflow, and has not said the roof is leaking. The finding is a closed ventilation path, not a proved moisture result.
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?
The eaves gap is easy to lose when insulation is pushed out to the wall plate to keep the top of the wall warm. On a cold roof that push closes the very opening the roof space needs. The underside of the felt or tiles then has less moving air, which is the same family of risk as painted soffit vents, but the blockage here is the quilt itself. The survey can describe the insulation it found jammed in. It cannot say how wet the loft becomes in January.
A roofer or insulation fitter can pull the quilt back and fit eaves trays so the gap returns without leaving the wall plate bare. Tell the solicitor the report notes a blocked cold-roof path, not a failed covering and not a measured damp problem. The survey has not specified new felt and has not told you to remove all the insulation. If soffit vents are also painted shut, say so as a second closure of the same path. Leave the quilt in place until someone fits a proper eaves detail.
What should you ask your surveyor?
- Where was the insulation stuffed in so that the eaves gap had gone?
- Is this loft a cold roof that needed that gap, as you saw it?
- Did you see condensation, or only the blocked ventilation path?
What are the typical next steps?
- Record the stuffed eaves as a blocked cold-roof intake.
- Have the insulation pulled back and an eaves gap restored.
- Do not read the note as a measured leak or a condensation test.
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 loft feels warm, is the blocked gap an advantage?
Warmth in the loft does not replace the eaves path on a cold roof. The survey saw the gap gone. It has not treated that as an improvement, and it has not measured what the closed intake does to moisture.
Does thick insulation on the flat of the loft cause the same block?
Insulation lying on the ceiling is the normal place for it. The block in this note is the quilt stuffed into the eaves until the gap disappeared. Depth over the ceiling is a different detail the survey has not called a fault by itself.