Damp proof course for sole plates
What it looks like
Omission or incorrect placement of the DPC can lead to moisture ingress and subsequent rot in timber sole plates.
Why it happens
A continuous damp-proof course (DPC) must be installed beneath all timber or metal stud wall sole plates positioned on solid floors. This prevents moisture from rising from the floor slab into the timber or metal framework, protecting against degradation and rot. The DPC acts as a capillary break.
What it costs if it is missed
A continuous damp-proof course (DPC) must be installed beneath all timber or metal stud wall sole plates positioned on solid floors. This prevents moisture from rising from the floor slab into the timber or metal framework, protecting against degradation and rot. The DPC acts as a capillary break.
How to inspect for it
Confirm that a continuous DPC is correctly laid beneath all sole plates on solid floors.
How to prevent it
A continuous damp-proof course (DPC) must be installed beneath all timber or metal stud wall sole plates positioned on solid floors. This prevents moisture from rising from the floor slab into the timber or metal framework, protecting against degradation and rot. The DPC acts as a capillary break.
Basis in regulation
BS 8000-2
Read the source
Last updated 23 August 2026. This is our editorial summary of publicly available regulation and site practice, not building control approval or a warranty determination.