Chimneys and parapets
A stay on a bungalow chimney is rusty and the stack is upright. What is the stay doing, and what lean of the stack has it not proved?
The stay is a metal brace for the bungalow stack, and its rust has not proved that the stack leans. The stack is upright. A stay exists because a chimney on a low bungalow roof stands tall in the wind, and the metal helps hold it. Rust is corrosion in that brace. The survey recorded a rusty stay and an upright stack. It has not tested the metal, and a plumb stack is not proof the stay is still at full strength.
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?
A stay works between the stack and a fixing on the roof or another anchor. Once it is rusty the section can be thinning while the stack still looks upright. An upright stack means no lean was recorded. It does not make the stay redundant, and it does not promise a lean will never follow if the brace fails later. The inspection did not measure the remaining metal and did not say something else is tying the stack. Rust and plumb are the whole note.
Ask a chimney contractor to look at the stay, both fixings, and whether the stack still depends on it. Tell the solicitor the stack was upright and the stay was rusty. Do not rebuild the chimney because the stay is corroded, and do not ignore the stay because the stack is plumb. The survey has not specified a new stay and it has not cleared the metal.
What should you ask your surveyor?
- What is the rusty stay there to do for this bungalow stack?
- Was the stack upright, so no lean was recorded?
- Has rust on the stay been left unmeasured?
What are the typical next steps?
- Treat the stay as a rusty brace, not as proof of a lean.
- Ask a chimney contractor to check the stay and both fixings.
- Do not rebuild the stack merely because the stay is rusty.
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 stay is slack, has the stack already leaned?
Not according to this note. The stack is upright, so a lean has not been recorded. Slackness, if you later find it, would be about the stay, not a lean the survey has already proved. Rust is the finding on the metal. The survey has not said the stack is out of plumb, and it has not measured the stay.
Can the stay be removed because the stack looks straight?
Do not remove it on that reasoning. Straightness has not proved the stay is spare. The stay is doing a bracing job, and rust means that brace is corroded, not that it was never needed. A contractor should say whether a sound stay is still required. The survey has not cleared the metal for removal.