Use a wire brush or a grinder or an acid substitute to prepare the concrete.
Damp concrete garage floor.
Sometimes the issue can be bridging of the damp proof course by the concrete floor assuming is was timber prior as this often occurs.
How do you fix low spots in garage floor concrete.
All seemed good and it dried well.
Concrete s porous nature means that water from under your home can seep up through your concrete floor making it damp.
How to damp proof concrete floors.
Damp in concrete floors.
Damp proof membranes for concrete.
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.
In an ideal world damp proofing methods should be taken during the initial construction phase of the garage.
Floor membrane from property repair systems roll out and lay on either chipboard plywood mdf or screed.
Dry out your warehouse and materials using air movement.
It could also be bridging by the internal plaster or a failure of the wall floor joint.
Due to concrete s porous nature it can then travel through it causing issues in the flooring above.
After the construction was finished i painted the concrete floor in the new extension.
I believe a damp proof sheet was used under the concrete floor as indicated by the telltale black sheeting used before the concrete floor was poured.
Use a de greaser to remove oil from the surface.
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.
Here are 6 ways to reduce concrete floor condensation.
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.
Changes in the surrounding environment can have a major impact on moisture levels within the concrete slab.
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.
I m guessing that this sheeting is the vapour barrier you talk about.
I suggest you get an independent survey to pinpoint the problem before undertaking any remedial works.
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.