And for even greater effectiveness, you might consider installing an attic fan, as well ... of the vent hole and install 1 x 3 or 1 x 4 boards around the hole to act as a flat mounting surface ...

Sheets of foam board can be cut to fit tightly between wall studs or attic ceiling joists. Because they are not as effective ...

and electrical industries move safely through an attic space, while preventing ceiling damage and increasing productivity. The boards are constructed from durable, lightweight composites with beveled ...