Insulation Against Concrete Walls

The concrete block walls are porous and so you re not going to get a lot of thermal insulation.

Insulation against concrete walls.

While concrete provides a high degree of strength and durability it offers very little natural insulation for the home. And there is no effective way to fill the voids in an existing concrete block wall. It can fill in all the gaps and spaces thoroughly giving you the best protection against moisture and air infiltration. 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.

Adding insulation to your concrete walls. See how to insulate a basement wall and tyvek or tar paper question. When this type of insulation is installed in contact with concrete moisture in the interior air can condense against the. Closed cell spray foam is the best way to insulate concrete basement walls.

R value is usually between 2 21 and 2 86 it is structural material and must be always accompanied by an insulation layer. This type of details almost always leads to a serious mold problem and obviously a potentially risky health. Polystyrene foam boards commonly called foamboard are a clean lightweight convenient way to insulate bare concrete walls. How to glue polystyrene insulation to a concrete wall.

Fiberglass insulation inside a bag hanging from the rim joist down along the foundation wall. Inside the drywall is nailed to studs fastened flat against the block. Stud wall filled with fiberglass insulation an inch or two away from the concrete wall. 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.

How do i insulate walls with stud bays only 1 inches thick. 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. David caruso springfield pa. I have a 1950s brick colonial with uninsulated concrete block walls.

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. How to insulate a concrete wall. This is because it can achieve a higher r value along with excellent moisture resistance with less thickness required.