Interior Wall Framing On Concrete Sill Sealer

The reason is simple.
Interior wall framing on concrete sill sealer. Ordinary foam sill sealer works best as a capillary break but it doesn t always work so well as an air seal. A sill sealer gasket is traditionally used in wood construction applied to the top of a concrete or block foundation wall for at least two reasons. Foamsealr sill plate gasket is made of polyethylene foam offering exceptional durability. You can also caulk between the top of the sill plate and the.
Choose a length that will penetrate the concrete at least 1 inch. The light blue sill sealer installed between the bottom plate and concrete most likely for air sealing in the top photo is closed cell foam. It s meant to be an air sealing gasket but it also is working as a capillary break because it keeps water in the concrete from wicking up into the wood. Other nails have a thick shank that sometimes has spiral ridges for improved holding power.
The sill plate is just above the top of the foundation wall and you ll find a concrete ledge about 2 1 2 inches wide before reaching the sill plate. Cut four or five two by four blocks each perhaps 10 to 12 inches long and insert them between the end studs on. 1 because the tops of foundation walls are generally not even or have deviations in plane which permit the passage of air. Be sure to wear safety goggles when hammering masonry nails into concrete.
Apply a bead of caulk along the inside perimeter where the sill plate meets the concrete slab if desired for additional air sealing. One option for improving the air seal if you use conventional sill seal is to seal from the inside with high quality polyurethane or a siliconized acrylic caulk formulated for adhering to concrete. Insert shims between the joists and wall as necessary to make the wall fit snugly. The best place to caulk the sill is from inside the basement or crawl space.
The crease between this ledge and the edge of the sill plate is the best place to apply the sealant.