Condition ratings
Chipboard beside the bath feels soft underfoot. Has the survey proved the joists have failed?
No. Chipboard that feels soft beside the bath has not proved the joists have failed. The soft spot is the deck the foot found, usually where a spill has reached the board. Joists sit under that deck and were not exposed by feeling the surface. The survey can rate the soft board. It cannot, from that feel alone, declare the timbers beneath rotten or broken.
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?
Chipboard beside a bath is a deck that does not like water. Soft underfoot means the board has lost its stiffness in that patch, often from a failed seal or a spill. That is a defect in the deck you can stand on. It is not a sight of the joists. Rating 2 is a repair or replacement that is needed but is not serious or urgent, which may fit a local piece of boarding. Rating 3 is serious, urgent, or both, if the surveyor thinks the deck is unsafe to rely on, and that is when written quotations come before legal commitment. Either rating is of the board. The joists remain concealed, and concealed parts are not guaranteed sound, nor have they been proved failed.
The what to do now note advises you, the buyer. It does not invoice the seller for new joists because a board felt soft. A bathroom seal, the bath panel, and the floor are different lines. If the panel was not opened, the void behind it is NI, not rating 1. Do not lift the deck in a house you do not own. If you need to know whether the timbers are affected, agree an opening-up. Until then, describe the defect as soft chipboard beside the bath, and let a carpenter tell you, after seeing it, whether the work stops at the board.
What should you ask your surveyor?
- Is the rating on the chipboard, or have you claimed the joists?
- Was the bath panel opened, or is the void NI?
- Do you call this soft patch serious or urgent?
What are the typical next steps?
- Describe the defect as soft chipboard, not as failed joists.
- Do not open the bathroom floor before you own the house.
- If the deck is rating 3, get written quotations before you commit.
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 board is rating 2, can the joists still be a worry?
Yes. Rating 2 does not see them. Concealed joists are not guaranteed sound, and they are not proved failed either.
Does a stained ceiling below prove the joists?
No. A stain shows water passed. It does not show the condition of the timbers. Read that ceiling as its own element.