I’m glad to hear the basement is drying out. And you can already feel a difference. Yay!
For cutting the styrofoam with a bread knife. Lol. Yes, what a mess that would make. <giggle>
Use a razor knife. Those retractable blade knives. While working at a table or work bench. Measure and mark the line you want to cut. Then lay a straight edge, one of those 2x4’s, or whatever along the line. Run the razor knife gently down the edge and along the line. You are not trying to cut through all 2 inches in one go. Just score the line a few times with the knife.
(Note: Have the blade fully extended. Yes it is very sharp, but you are not pushing through the cut, you are working gently. The big reason for having the blade fully extended is those first scoring cuts. You don’t want the knife handle to contact the straight edge; that messes up the line and causes the next part, the deepening of the cut, to be off square. You also need a blade around 4 inches to cut at the correct angle and depth for that insulation.)
Then remove the straight edge and lay the styrofoam over the edge of the table or work bench with that cut line an inch or so passed the edge. Put a weight, like the 2x4, or book, or whatever on the edge furthest from you to hold it down against the bench. Then gently run the knife down the cut line while pressing the side closest to you (shorter side) of the insulation panel down, so as to slightly open the cut and not to bind the knife. A few more passes and the insulation is cut smooth and straight with very little mess.
-7C is 18F. Yep, pretty chilly. Apparently not t-shirt weather.
D
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.
<giggle>