The reason is simple.
Interior wall framing on concrete sill sealer.
And 2 because of the proximity of the bottom of the sheathing to the plate which may not fully cover or seal off the junction between sheathing and plate.
Be sure to wear safety goggles when hammering masonry nails into concrete.
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.
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.
1 because the tops of foundation walls are generally not even or have deviations in plane which permit the passage of air.
Cut four or five two by four blocks each perhaps 10 to 12 inches long and insert them between the end studs on.
Foamsealr sill plate gasket is made of polyethylene foam offering exceptional durability.
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.
The crease between this ledge and the edge of the sill plate is the best place to apply the sealant.
The best place to caulk the sill is from inside the basement or crawl space.
A simple effective long lasting solution to air infiltration foamsealr sill plate gasket provides a seal against air leakage moisture and insect intrusion at the juncture of the foundation wall and sill plate in new and retrofit construction.
Insert shims between the joists and wall as necessary to make the wall fit snugly.
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.
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.
Other nails have a thick shank that sometimes has spiral ridges for improved holding power.
You can also caulk between the top of the sill plate and the.
Some concrete nails are the cut nail design shown in the photo with a thick flat shank and a tapering v profile.