Insulation Against Concrete Walls

While concrete provides a high degree of strength and durability it offers very little natural insulation for the home.

Insulation against concrete walls.

How do i insulate walls with stud bays only 1 inches thick. Polystyrene foam boards commonly called foamboard are a clean lightweight convenient way to insulate bare concrete walls. I have a 1950s brick colonial with uninsulated concrete block walls. Stud wall filled with fiberglass insulation an inch or two away from the concrete wall.

It can fill in all the gaps and spaces thoroughly giving you the best protection against moisture and air infiltration. This is because it can achieve a higher r value along with excellent moisture resistance with less thickness required. Interior insulation refers to insulation applied to the interior side of the concrete masonry as shown in figure 1. The insulation may be rigid board extruded or expanded polystyrene or polyisocyanurate closed cell spray polyurethane foam cellular glass fibrous batt or fibrous blown in insulation note however that fibrous insulation is susceptible to moisture.

Fiberglass insulation inside a bag hanging from the rim joist down along the foundation wall. How to insulate a concrete wall. R value is usually between 2 21 and 2 86 it is structural material and must be always accompanied by an insulation layer. The concrete block walls are porous and so you re not going to get a lot of thermal insulation.

Plastic vapor barrier against concrete wall fiberglass insulation inside stud wall then drywall. David caruso springfield pa. When this type of insulation is installed in contact with concrete moisture in the interior air can condense against the. Adding insulation to your concrete walls.

Inside the drywall is nailed to studs fastened flat against the block. Usuallly fiberglass is not recommended in basements because it is so air permeable but paired with xps foam sheet at wall would be a hybrid solution. See how to insulate a basement wall and tyvek or tar paper question. While reduced costs might tempt you to use fibrous insulation such as fiberglass batts mineral wool batts or cellulose these materials are air permeable and should never be installed against a below grade concrete wall.

Just be sure to use unfaced batts no kraft paper covering. And there is no effective way to fill the voids in an existing concrete block wall. I can t tell you how many finished basements i ve seen with wood framed walls directly against the concrete and the cavities of the framing filled with fiberglass insulation in direct contact with the concrete foundation walls. How to glue polystyrene insulation to a concrete wall.