How Thick Insulation For Concrete Floor

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.

How thick insulation for concrete floor.

The math is pretty simple the thicker the concrete floor insulation material the deeper the slab will have. Thicknesses of dpms vary but 1 200 gauge is a common thickness. 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. Step 4 place 2 inch thick pieces of rigid styrofoam insulation on top of the plastic sheeting.

It is preferable to cover the area being worked on with just one large sheet but in cases where more than one sheet is required joins should overlap by at least 150mm and be sealed to prevent any moisture coming up through the new concrete slab. Why is this the case. The plastic serves as a vapor barrier preventing moisture from passing up through the gravel to the concrete floor above. The first important thing to pay intention to is the depth of the floor slab.

80 of the heat is lost through 20 of the total surface. In cold climates it is advisable to use a minimum of 2 inches of extruded polystyrene under the slab. Namely if you are only digging the slab you will need to take into account the thickness of the insulation since it will affect the depth of the slab. 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.

It s the old pareto 80 20 rule with concrete floors. Designers generally insulate both directly under the slab and around the perimeter as well. There are two main reasons that i know of. Insulation sheets should be laid tightly together with the joints staggered to avoid movement.

Room alterations you will need to think about raising skirting boards trimming doors and maybe moving sockets. Thickness many types of insulation board are at least 50mm thick raising the level of the floor. Place the insulation edge to edge using duct or other construction tape to hold the insulation together.