Timber decay and woodworm
Where a report pairs brick nogging with an oak frame, what stays open about a gap where the nogging has shrunk?
What stays open is everything a gap does not prove by itself. Brick nogging is the infill between oak studs, and a gap where that brick has shrunk away from the timber is a joint the survey could see. The visit has not decided whether the gap is only old shrinkage, whether rain can pass through it, or whether the oak at the joint is decayed. It has not opened the gap. Pairing the nogging with the frame names the wall. It does not close the question of the joint.
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?
Oak and brick move differently. As the frame seasons and the mortar shrinks, a dark line opens beside the stud. That line can be a stable shrinkage gap, or it can be a route for weather onto the back of the timber. From the room, the surveyor sees the gap, the brick and the oak. They cannot see the tenon, or whether the gap goes through to the outside. A narrow line is still only a line until the joint is looked into properly.
Tell the solicitor the gap is an open observation, not a finished account of the frame. A timber specialist can record how far the joint has opened and whether the oak at that edge is soft, which this visit did not test. Do not have the gap filled just to tidy the room before anyone has seen the timber. The report paired nogging and oak because that is how the wall is built. The condition of the shrunk joint stays unresolved.
What should you ask your surveyor?
- How wide was the gap, and was it on one stud or on many?
- Could you see daylight or damp staining through the joint?
- Was the oak beside the gap soft, or only standing off the brick?
What are the typical next steps?
- Treat the gap as an open joint, not as a finished diagnosis.
- Ask a timber specialist to look along the oak at that joint.
- Tell the solicitor the back of the stud was not exposed.
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
Should the brick nogging be rebuilt because a gap has opened?
Not on this note alone. A shrinkage gap between nogging and oak is common, and the survey has not said the brick is loose or that the stud has failed. Rebuilding the infill is a repair nobody has specified. The gap was seen. What it means for the frame stays open until the joint is examined more closely.
Is the brick holding the floors up?
The survey has not decided that. In this sort of wall the oak frame is usually the structure and the nogging is infill, but the visit did not test the studs and did not prove the brick is carrying load. It paired the two and noted a gap. Keep the structural role and the shrinkage as separate questions.