Damp Under Carpet Concrete Floor

This can cause issues with mold and mildew especially if you have carpet or.

Damp under carpet concrete 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. Sometimes the issue can be bridging of the damp proof course by the concrete floor assuming is was timber prior as this often occurs. I suggest you get an independent survey to pinpoint the problem before undertaking any remedial works. The permanent fix will be to re plumb the house in pvc through the attic which will cost about 4000 and which i ll do next month.

Commonly concrete floors are vulnerable to moisture and suffer from different detrimental influence of moisture such as lifting tile off the floor rotting hardwood damping carpet coating delamination and many more. Condensed moisture accumulation under the plastic at 16 hours can indicate a problem. These problems are not only disrupting functions of the building due to maintenance operations but also costly. Which type of coating is chosen will depend on the intended use of the floor.

It becomes a problem when the moisture levels are too high and water is transferred to the finishing layer above. Preparation is key with these coatings and the substrate must be sufficiently clean and dry. Moisture in a concrete subfloor for moisture to accumulate between the concrete slab and the flooring it needs to find its way to that middle layer. Duct tape an 18 inch square piece of plastic onto the exposed concrete and leave it for 16 hours.

If this is the case then the slab itself would need taking up a new damp proof membrane would need to be installed then a new concrete floor needs to be installed. One of the simplest most economical test methods for determining whether there may be moisture in concrete is the astm d 4263 concrete moisture test. Concrete s porous nature means that water from under your home can seep up through your concrete floor making it damp. Most damp proof floor coatings are applied directly to the concrete floor surface using a brush or roller.

The second and most likely being a basement flat is that the damp proof membrane in the slab floor has broken down allowing moisture to travel up through the slab and cause a problem.