Wall ties and cavity insulation
The report names urea-formaldehyde foam in a 1930s cavity. Why is that fill not the same product as a modern bead, and not a pass for the ties?
The urea-formaldehyde foam named in this 1930s cavity is not a modern bead, and it is not a pass for the wall ties. The report is naming a fill, not testing the links between the leaves. An older foam and a later bead are different products. Neither one tells you the ties are sound. Do not invent a ban, or a year of a ban, from the name. The ties remain a separate question.
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?
What the survey could say is the fill it named, as far as the evidence on this visit went. A bead that spills from a hole is a different material and a different observation. Confusing the two makes a later reader think the wall has been tested when only a product name has been written down in the report.
Ties hold or fail for reasons of their own, in the metal, the mortar and the way the leaves were built. Fill sitting in the cavity does not answer those points. Keep the foam as the fill comment. If the ties need checking later, that is a further instruction, not a conclusion already hidden in the product name.
What should you ask your surveyor?
- What did you actually see of the foam, rather than only a name in a note?
- Are you calling this fill urea-formaldehyde foam, and not a modern bead?
- Have you left the wall ties untested by this particular comment?
What are the typical next steps?
- Keep the named foam and the wall ties as separate questions.
- Do not describe the foam as a modern bead, or as proof the ties are sound.
- Do not add a ban or a year that the report itself did not state.
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 foam looks shrunken, have the ties failed?
No. Shrinkage, where it was seen, is a comment on the fill alone. It is not an examination of the ties between the leaves.
Can you treat this foam as the same job as bead insulation?
No. The report names urea-formaldehyde foam, which is not a modern bead. The two products should not be written up as one.