Wall ties and cavity insulation
Loose beads have spilled into the eaves void. Has anyone measured how much fill remains inside the cavity?
No. Nobody on this visit measured how much fill remains inside the cavity. Loose beads in the eaves void show that some insulation has left the wall and gathered where the roof meets the wall plate. A spill is not a volume. The survey did not open the cavity, did not test the wall ties, and did not decide the wall is still fully filled or partly empty. It recorded beads where they had spilled. The amount still inside stays unknown.
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?
Bead fill is loose insulation blown into a cavity. When it escapes, it can pour into the eaves void through gaps at the wall head. What you can scoop up in that void is the escaped portion, not a reading of what is left between the leaves. Distribution can be uneven from bay to bay. Counting a handful would not answer the wall. This inspection did not try to. The beads are evidence of movement of the fill, not a stocktake.
Ask the solicitor for any cavity-fill guarantee and for whether it names this elevation. An insulation firm can assess what remains if you instruct that, which may include opening the cavity. The home survey has not done so and has not tested the ties. Do not tell a lender the walls are fully insulated, or empty, because beads sit in the eaves. The remaining fill was not measured.
What should you ask your surveyor?
- Were the loose beads only recorded in the eaves void?
- Did anyone measure fill left inside the cavity?
- Were the wall ties left untested?
What are the typical next steps?
- Treat the spill as escaped beads, not as a measured remainder.
- Ask the solicitor what any fill guarantee actually covers.
- Do not claim the cavity is full or empty from the eaves alone.
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
Do spilled beads mean the cavity has emptied itself?
Not necessarily. Some beads can escape while a large amount stays in the wall, or the loss can be worse than the handful suggests. This visit did not measure either way and did not open the cavity. Record the spill. Do not convert it into a figure for what remains between the leaves.
Can escaped beads block the eaves ventilation?
They can pile against the eaves and obstruct airflow, but this survey has not measured that pile or traced every bay. The note is that loose beads have spilled into the void. It is not a ventilation test and not a tie test. If the heap is deep enough to matter, that needs a proper look rather than a guess from one handful.