![]() What the heck is the purpose of the nail that is sticking into the sill plate? It was buried in the mortar that I removed. You can see that the mortar on the right side of the photo has not separated from the top of the foundation wall. ![]() That's my main question, but here are another couple of questions if you have interest or time.īelow is a stretch of wall where I removed the mortar that had separated from the top of the wall. Is there a better option you'd recommend? However, since it's maybe 1/2 an inch, would it be better to shove a narrow strip of wood into the insulation to give the caulk something to adhere to? Or I could cut a narrow strip of wood (say, 1" by 1/4") and staple that to the front of the sill plate in a fashion that covers up the insulation gap and then caulk along where that strip meets the foundation wall and also where it meets the sill plate. If the gap between the sill plate and the wall was a little smaller, I could just run caulk in it. However, where it has separated, I need a better solution. In the places where the mortar has not separated from the wall, it's easy enough to just run caulk along between the mortar and the sill plate. As part of the job I am trying to seal the gap between the sill plate and the foundation wall. I'm using rigid foam board instead of spray foam, and I'm using caulk instead of Great Stuff / expanding spray foam. I am in the process of insulating the rim joists. ![]() An eighth to as much as a quarter of an inch, except above windows where it's more like 1/2") However, there are places along this wall where the mortar has indeed separated by a fraction of an inch from the poured foundation wall. (Edit: the picture happens to be in a location directly above a basement window, and the mortar has separated from the frame above the window. In this photo it has separated from the top of the wall. Attached to the sill plate is some mortar. For orientation to the photo: the white in the lower left corner is the vertical face of the wall. The foundation is poured and from early 1970s. Here is a picture of the top of my uninsulated basement wall.
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