How Thick Insulation For Concrete Floor

The math is pretty simple the thicker the concrete floor insulation material the deeper the slab will have.

How thick insulation for concrete floor. The first important thing to pay intention to is the depth of the floor slab. Why is this the case. It s the old pareto 80 20 rule with concrete floors. Thicknesses of dpms vary but 1 200 gauge is a common thickness.

80 of the heat is lost through 20 of the total surface. Insulation sheets should be laid tightly together with the joints staggered to avoid movement. Step 4 place 2 inch thick pieces of rigid styrofoam insulation on top of the plastic sheeting. Place the insulation edge to edge using duct or other construction tape to hold the insulation together.

Lightweight rigid polyisocyanurate pir foam insulation boards such as those manufactured by celotex are among the most thermally efficient commonly available. If you have enough clearance in the basement to add a few inches of height to the floor one of the most effective ways to insulate the floor is to first install a sheet of polyethylene as a vapor barrier over the concrete extending it about three inches up the walls. Thickness many types of insulation board are at least 50mm thick raising the level of the floor. Not a finished surface you will need to lay a chipboard layer over the insulation boards adding to the height.

There are two main reasons that i know of. The plastic serves as a vapor barrier preventing moisture from passing up through the gravel to the concrete floor above. Many increase the under slab insulating foam board thickness to 3 or 4 inches at the outer 2 to 4 feet of the slab. Designers generally insulate both directly under the slab and around the perimeter as well.

Room alterations you will need to think about raising skirting boards trimming doors and maybe moving sockets. The insulation is then laid followed by a polythene separating layer and either a concrete screed or tongue and groove chipboard ready to receive the specified floor finish. A 50mm thick layer of proprietary floor slab insulation is usually enough to reach and maintain the target u value but this should be checked with an architect first.