Wall ties and cavity insulation
A horizontal crack follows the first-floor line on a cavity wall. Why should that not be filed as ordinary settlement without a question about the ties?
Because that line is where a tie question belongs, and ordinary settlement has not been shown. A horizontal crack following the first-floor line on a cavity wall is the sort of bed-joint crack people associate with expanding, corroding ties, which are often placed near floor levels. The survey has recorded the crack and where it runs. It has not tested the ties, and it has not established settlement of the foundations. Filing it as ordinary settlement skips the cavity-wall mechanism the crack itself raises. The two labels are not interchangeable on this pattern.
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?
Corroding steel ties expand in the outer leaf and can open a horizontal crack along the bed joint, sometimes in a band around a storey. Settlement of foundations more often shows as a tapered or diagonal crack, not a level line at the first floor. The shapes are not a laboratory result. They are a reason to keep the tie question open. The home survey did not endoscope the cavity and did not pull a tie. A settlement label without that question overstates what one crack direction has proved.
Ask the surveyor whether the crack is in the outer leaf at bed-joint level, and whether anything else, such as a floor joist bearing, was visible. If the pattern is left unexplained, commission a wall-tie inspection rather than a subsidence story. Tell the solicitor not to describe this to an insurer as ordinary settlement. The survey has not called it that, and it has not tested the ties that the crack invites someone to ask about.
What should you ask your surveyor?
- Does the horizontal crack follow the first-floor bed joint on the outer leaf?
- Did you test any wall tie, or only record the crack?
- What in the pattern would stop you calling it ordinary settlement?
What are the typical next steps?
- Keep a tie question open on this horizontal floor-line crack.
- Do not file it as ordinary settlement of the foundations.
- Arrange a wall-tie inspection if the crack is to be explained.
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 crack is hairline, can the tie question be dropped?
No. Width was not a test of the ties. A fine horizontal crack at the first-floor line on a cavity wall still raises the tie question. The survey did not investigate the ties, whatever the crack looks like in width.
Could a joist bearing cause a line at that level without tie corrosion?
It could, and the survey has not chosen. A bearing can disturb brickwork near a floor. That possibility is another reason not to file the crack as ordinary settlement, and it is still not a tie test. The report leaves the floor-line crack where it is, without a second finding.