Cut 1½" pink board into strips that fit between those boards. Then all you have to insulate a little better is the walls.
More pink board I'd say.
Then tape the seems. Even if it's only 3/4" or 1". It's not that expensive and way better than nothing.
More pink board I'd say.
Then tape the seems. Even if it's only 3/4" or 1". It's not that expensive and way better than nothing.
