** Always refer to the damp proof membrane manufacturer’s guidance and specification. For example, just like the diagram below. These strong and highly durable Polyethylene 1200 Gauge DPMs are sandwiched between the hard core and concrete slab to form an impermeable layer. These days, damp proof membranes are required in the construction of all new buildings to prevent rising damp. When constructing an extension or a new build home, it is important that damp proofing measures are taken during the initial construction phase itself. Fully isolate the dampness in the floor using a surface Damp Proof Membrane (DPM)ĭamp proofing concrete floors above ground Damp proofing for extensions.Dig up the old concrete floor, install a new damp proof membrane and lap up edges before replacing the concrete slab.When faced with damp in concrete floors, there are two options available: It is suggested that you consult a contractor before any large garden landscaping projects. This means that ground moisture levels will raise, putting pressure on your home’s damp proofing system, in particular the concrete slabs. For example, if you remove a large tree or shrub from your garden, it no longer uses water from the ground. Due to concrete’s porous nature, it can then travel through it, causing issues in the flooring above.Ĭhanges in the surrounding environment can have a major impact on moisture levels within the concrete slab. Damp in Concrete Floorsĭamp from the ground can make its way into your concrete floor. We take you through the damp proofing methods available and how to install them. In this guide, we look at how to damp proof concrete floors above and below ground. This is when you experience damp issues in carpets and floor coverings, the warping of wooden floors. 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.
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