I can understand the instructions on how to remove an old exterior door and install a new, prehung door. This is for the entryway to my unattached garage. I think I can manage it.

But I get to the step where, near the end, I'm supposed to "stuff fiberglass insulation into the gap between the door jamb and the wall framing. Make it snug, but don't stuff it too tightly." My prehung door installation instructions says the same thing.

My question is, if I only have 1/8" between the door jamb and the wall, just how am I supposed to stuff insulation in there? It's not that big a gap! Can't I just caulk it, like I will on the outside, since the door will be an entryway into an unfinished garage?


Thanks
Susan

 

Those instructions are archaic. Vintage 1950, I'd say. Apply trim on one side first. Then use a can of foam insulation instead. (Ask for Door & Window foam from your supplier).