Mostly the damp proofing is installed below the surface of the slab.
Damp proof membrane above concrete slab.
Commonly used to protect a buildings concrete slab from moisture rising from the foundations damp proof membrane is a versatile product and can be used for a wide range of applications such as creating a protective surface before laying laminate or wood floors.
A dpm damp proof membrane is a plastic sheet membrane that sits between a concrete slab or screed and acts as a barrier to stop moisture and contaminants entering a property from the ground.
Damp proof membrane dpm an impervious membrane should always be applied as a damp proof membrane dpm above or below a ground floor slab to stop ground moisture reaching the upper surface of the floor.
Physical damp proof membranes for concrete floors physical damp proof membranes such as oldroyd xs slimline membrane are often quicker and easier to install than using damp proof coatings as they can be installed on still damp surfaces.
Applying damp proof membranes dpm s can be applied to either a suitable blinding layer under the slab or internally to the top of the slab.
1200 gauge dpms should be used when a floor is direct to the ground.
Instead of inserting a sheet in between the two layers you paint the liquid membrane directly onto the floor creating an impenetrable moisture barrier.
Wooden floors to be laid on top of the slab enabling works to be completed more quickly than would otherwise be the case.
In newbuild situations it may be necessary to install a damp proof membrane on top of a concrete slab to enable moisture sensitive floor finishes e g.
It becomes a problem when the moisture levels are too high and water is transferred to the finishing layer above.
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.
Mostly plastic film of vapor retarders is employed below the slab surface as a damp proofing membrane.
You should use them to protect all final floor finishes.
Damp proofing of slabs on ground.
If the ground could contain water soluble sulphates or there is any risk that sulphate or other deleterious matter could contaminate the hardcore the membrane should be placed at the base of the concrete slab.
When can a dpm be installed.
A liquid membrane just like the membrane above will create a protective layer that will prevent moisture reaching the surface of your garage floor.
The damp proofing of slabs constructed on ground can be done either below or above the surface.
