Rising Damp Under Carpet

You also mentioned that there are vinyl tiles over the floor.

Rising damp under carpet. It becomes a problem when the moisture levels are too high and water is transferred to the finishing layer above. Fixing the damp proof membrane. This is less common in new buildings as damp proof membranes are required at the initial construction phase to prevent rising damp. If your property is suffering from rising damp which then rises through to the surface of the concrete then this is a more complicated procedure to fix.

To fix this problem would require isolating the source of the moisture problem and then taking the necessary steps to help the floor dry out. Concrete s porous nature means that water from under your home can seep up through your concrete floor making it damp. Rising damp also known as salt damp or salt attack is a natural phenomenon where salty ground moisture rises by capillary action up a brick or masonry structure such as a wall or a fireplace. Concrete is a naturally very porous material and water can rise up or travel through capillaries which can lead to damp floors and mould issues.

Assuming that the damp proof membrane dpm under the concrete has failed in areas then yes you possibly would get the odd patch of dampness showing in the floor. It often happens to older buildings. If there was no dpm i would suggest a uniformal distribution across the whole floor. Damp rising through concrete floor slabs is fairly common when a damp proof membrane has failed or was not installed before the floor was laid.