Damp Floor Under Posts

When faced with damp in concrete floors there are two options available.

Damp floor under posts.

Effectively a thick plastic sheet a damp proof membrane dpm is used to create a barrier between a concrete or screed subfloor and a wood floor. Should there be a white cream fungus material growing on the soil or on the bricks then the sub floor area is very damp. The floor is quite level other than the 1mm difference where the bitumen is. Damp proof membranes are routinely used during the construction of a concrete floor.

A damp proofing concrete floor solution is particularly important. Hopefully there is an image attached below. When tile flooring feels damp and no liquid has been spilled on it it s likely condensation that has formed on the tile surface. A basement post is usually installed to counteract a sagging frame in a wood frame house.

Damp proof membranes dpms a damp proof membrane or dpm is a waterproof barrier that s introduced between your sub floor and your wood floor. The earth level under the house should be well under floor level to give adequate sub floor airflow. However typically these are often fairly thin and are sometimes damaged even before they are laid. This is because damp rising up through concrete floors is a pretty common issue.

Dig up the old concrete floor install a new damp proof membrane and lap up edges before replacing the concrete slab. I have read through all i think the parquet damp concrete sub floor threads in this forum and picked up some great information. Inspect the sub floor area in as many locations as possible shine a torch through vents. If the tile surface is cooler than the warm humid room air the moisture inside the air becomes the dampness on the floor tile when the warm air and cool floor meet.

Fully isolate the dampness in the floor using a surface damp proof membrane dpm damp proofing concrete floors above ground damp proofing for extensions.