Wall ties and cavity insulation
A new opening has been cut in a cavity wall and no cavity tray was seen over the head. Is the missing tray the same finding as failed wall ties?
The missing cavity tray over the new opening is not the same finding as failed wall ties. A tray at the head of an opening should catch water in the cavity and lead it outside. Wall ties are the links between the two leaves. Not seeing a tray is a comment on that opening. It does not show that the ties have corroded, snapped or lost their grip, and the two remarks must stay apart.
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?
Cutting a new opening changes the head of the wall. Without a tray, water in the cavity can track onto the inner leaf above the frame. That is a weather-detail question about this opening. It is not a test of the metal or wire that ties the leaves together on the rest of the elevation. The two findings stay separate.
Failed ties, where they are suspected, need their own look at the cavity and the leaves. A stain or a new lintel does not stand in for that inspection. Keep the missing tray as the finding about this head. Do not let a later reader turn one absent detail into a verdict that the wall ties have failed.
What should you ask your surveyor?
- Where did you look for the cavity tray: above the frame, or only from inside the room?
- Are you separating that missing tray from any comment about the wall ties?
- What was actually visible at the head of the new opening?
What are the typical next steps?
- Keep the missing tray and the wall ties as two separate comments.
- Do not say the ties have failed because the tray was not seen.
- If the cavity at the head needs opening, agree that as a further instruction.
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
Can a new lintel be assumed to include a cavity tray?
No. A lintel is not a tray. The survey did not see a tray over this opening, and it should not invent one hidden behind the frame.
Does rain staining inside prove the ties have failed?
No. Staining can fit a missing tray or another leak at the head. It is not an inspection of the ties in the cavity.