How To Install Rigid Insulation Under Floor

Place the insulation edge to edge using duct or other construction tape to hold the insulation together.

How to install rigid insulation under floor.

Rigid foams just need a few tacks to ensure they do not drop. Install at full depth a 25mm thick perimeter strip of the same floor insulation along all external walls. The way the insulation is installed will vary with the type and rigidity of the insulation. But insulating your floors is a good idea for many reasons including energy efficiency and height adjustments.

Semi rigid batts will need battens fixed along the joists. Lay down a moisture barrier with sheets of 6 mil plastic if you have a dirt or gravel floor. Installing rigid foam insulation there s two ways you can go about with foam board insulation. There are two ways to handle insulating concrete floors.

1 squirt either caulk or expanding foam insulation in every hole. Run sections of insulation from the rim joists to the crawl space or basement floor all along each wall. This is a vitally important step as it helps prevent cold bridging. Install 1 by 3 furring strips over the insulation panels on top of each stud.

Place 2 inch thick pieces of rigid styrofoam insulation on top of the plastic sheeting. Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. Firstly you can apply it directly onto the house s concrete walls with the help of a construction adhesive that will hold it in place. You can attach wood sleepers to the floor fill the gaps with rigid foam insulation and then apply your finish flooring.

But it is important to know how to install foam board insulation properly. Here s what you need to know. The thickness required to achieve a u value of 0 25w m on a suspended floor is. Flexible wools will need battens across the joists.

When completed the entire slab area has a cover of rigid sheets of styrofoam. The first step is to build the floor joist or to strip back the floor until you can see the joist. As long as you have enough room to access the floor joist framing installing insulation under the floor is a fairly simple remedy. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling.