Foam layers are particularly lightweight and come in a variety of thicknesses, most of which offer some form of moisture barrier. The foam base, suitable for most types of wooden floors, is one of the most commonly used base options. All of these base layers have a moisture-proof membrane (DPM). This is necessary when placed on concrete subfloors or to protect the floor from moisture entering underneath. While most underlayers usually have certain waterproofing properties, a true moisture-proof base layer will ensure a high level of protection against moisture, which can pass from the subfloor to the wooden floor.
This is especially useful in basement projects. Moisture-proof base coats are sold in various calibers and each hardwood flooring supplier can help you decide which one is best suited for your flooring project. The moisture-proof QA Protech 3 mm wood base is a dense base layer of closed-cell polyethylene foam laminated on one side with a 1000 gauge waterproof membrane, an overlay and a self-adhesive strip. To secure the joints of the base layer, use steam tape if it has a concrete subfloor, or good adhesive tape if you are going to install it on a wooden subfloor. While reusing the base layer can be attractive, using a carpet base with laminate flooring will cause long-term problems.
