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Damp-proofing Solutions for Solid Floors

Damp rising through concrete floor slabs is fairly common. The damp-proof membranes used during construction of concrete floors are often thin, and can easily become torn before they are laid, rendering them ineffective.

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. wooden floors) to be laid on top of the slab – enabling works to be completed more quickly than would otherwise be the case.

Safeguard offer two options for the treatment of damp rising through existing concrete floors. We also offer solutions for waterproofing slabs during construction.

1. Liquid applied damp-proof membranes

A number of products in our range including, ECS Epoxy Floor Coating, Drybase Liquid-Applied DPM, Vandex BB75, and Vandex Unimortar 2 that can be applied directly to damp floors to create a damp-proof barrier. This method has the advantage of being extremely easy to apply and only fractionally raising the floor-level. However, it is important to ensure that the floor to be treated is correctly prepared and free from contamination. A typical detail is shown below:

Damp-proof membrane wooden floor

Where a trafficable finish is required ECS Epoxy Floor Coating or Vandex Unimortar 2 should be used.

Certain applications (e.g. covering with some types of wooden floor) require a vapour-proof membrane – in these cases Drybase Liquid-Applied DPM or ECS Epoxy Floor Coating should be used.

2. Oldroyd cavity drainage membranes

Oldroyd Xs DPM rolls

Where a solution requiring minimal surface preparation is required, Oldroyd Xs damp-proofing membrane should be considered.

Oldroyd Xs is a tough, polypropylene membrane that can be laid on top of damp concrete floors with minimal surface preparation. A wide choice of flooring types can then be laid on top, e.g.screeds, particle board, laminated wooden flooring.

Oldroyd Xs is much thicker than conventional damp-proof membranes, and is manufactured from polypropylene, making it extremely resistant to on-site damage. Its patented 'X' pattern makes it easy to cut and fold. It also allows moisture to move behind the membrane, and allows for shrinkage movement when screeds are laid on top.

In refurbishment projects, the use of Oldroyd Xs can allow new finishes to be applied to existing floors without the need to resort to expensive excavation and relaying of damp floors. Oldroyd Xs protects the flooring finish from dampness as well as contaminants such as oil, gas, and acids, making it an excellent choice for factory and warehouse conversions.

Oldroyd Xs DPM under laminate floor.

Where new floor slabs are to be laid, the use of Oldroyd Xs can allow the fast-track installation of floor finishes while the floor slab is still "drying down", allowing faster completion of projects.

Oldroyd Xs Flooring Membrane should not be used in aggressive groundwater situations. The studded Oldroyd Xv Clear or Oldroyd Xv Black membranes should be used instead. Call our technical department on 01403 210204 for details.

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