Wall ties and cavity insulation
What should you ask if cavity-fill beads or fibres are sitting on the loft insulation at the eaves?
Ask where the material seems to have come from, and whether the cavity is open at the head of the wall. Fill on the quilt means insulation has left the cavity and entered the roof void, which is not a test of the wall ties. The surveyor may see the mess at the eaves, but they still have not seen the ties inside the wall.
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?
At many eaves the top of the cavity is close to the loft, and poorly contained fill can spill onto the ceiling insulation. Beads or fibres there tell you the cavity job is not staying put at that edge. They can also block the eaves ventilation path, which is a roof comment, not a tie comment. The Energy Saving Trust’s cavity guidance assumes a cavity that can actually hold the fill. Material on the quilt is evidence that, at least here, it has not. A home survey records what is on the ceiling. It does not endoscope the wall because the loft looks untidy.
Do not sweep the beads into a bag and call the cavity repaired. Do not replace the wall ties because the loft is gritty. Ask the surveyor which slopes of the roof were affected and whether the rafter feet or the felt were also hidden. If you later ask an insulation firm to look, tell them the home survey did not inspect the ties and did not map the cavity. A loft photograph is not that map. Keep the roof ventilation point, if the surveyor made one, separate from any tie suspicion elsewhere in the report.
What should you ask your surveyor?
- Which parts of the eaves have fill on the quilt?
- Did you see an open cavity head, or only the spilled material?
- Are you commenting on the insulation, the eaves ventilation, or the ties? Please separate them.
What are the typical next steps?
- Photograph the eaves before anyone vacuums the quilt.
- Do not commission tie replacement because of beads in the loft.
- If the cavity is to be checked, that is a wall inspection, not a loft tidy.
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
Is fill in the loft the same as fill spilled from a weep?
No. One is at the top of the wall in the roof, the other is at a weep in the face. Both mean fill has moved. Neither is a tie test.
Does a clean loft mean the cavity fill is sound?
No. It means this loft did not show spilled fill. The cavity itself may still be uninspected.