It could also be bridging by the internal plaster or a failure of the wall floor joint.
Damp concrete garage floor.
I m guessing that this sheeting is the vapour barrier you talk about.
Changes in the surrounding environment can have a major impact on moisture levels within the concrete slab.
Damp in concrete floors.
Concrete slabs and floors can be excellent subfloor surfaces for tile and other floor coverings but too much moisture in the concrete can cause problems with flooring installations.
But if these methods are non existent or if they have failed in some way here are some ideas to resolve and reseal your damp garage floor.
If your garage floor is constantly wet or damp you may have a water problem from either excessive ground water a breach in the moisture barrier or a leaking pipe.
Damp proof membranes for concrete.
Due to concrete s porous nature it can then travel through it causing issues in the flooring above.
Use a wire brush or a grinder or an acid substitute to prepare the concrete.
After the construction was finished i painted the concrete floor in the new extension.
Floor membrane from property repair systems roll out and lay on either chipboard plywood mdf or screed.
Concrete s porous nature means that water from under your home can seep up through your concrete floor making it damp.
Therefore it s advisable to have a floor tested for moisture content prior to installing flooring or moisture barriers.
Damp from the ground can make its way into your concrete floor.
Here are 6 ways to reduce concrete floor condensation.
In an ideal world damp proofing methods should be taken during the initial construction phase of the garage.
How to damp proof concrete floors.
Sometimes you come in the early morning and you find your concrete flooring or slab soaking wet just sweating industry expert jason hornsby sees this common problem with his clients.
All seemed good and it dried well.
When damp proofing a concrete garage floor a plastic dimpled membrane is required if the floor is going to be boarded either with chipboard plywood or similar or if a concrete screed is going to be laid.
I suggest you get an independent survey to pinpoint the problem before undertaking any remedial works.
Sometimes the issue can be bridging of the damp proof course by the concrete floor assuming is was timber prior as this often occurs.
Use a de greaser to remove oil from the surface.
Dry out your warehouse and materials using air movement.