Winterizing Skylight???

I used a piece of foam, 2'x3'x2", cut a little larger than the skylight frame. Since the skylight is spherical, the long sides should have a slight radius, so when you shove it in the hole, there are no gaps along the sides. I didn't have the fore-thought to do so (you can see the small side gaps in the pic), so after this pic was taken, I shaped a couple thin pieces to stick in the side gaps. Friction, and a small lip on the skylight, keep the foam in place. It works very well. I purchased the green upholstery foam from a fabric store. An electric carving knife, like you use on the Thanksgiving Turkey, cuts the foam on a straight line, any radius or bevel you'd like. A serrated bread knife works, too, but is much slower. I got a Black & Decker electric knife at my Ace Hardware store for 15 bucks.


I put a piece of 1" foam behind our cab-over step window's vinyl cover, too.


A left-over piece of the 2" was cut to fit in the stove exhaust vent.


I managed to squeeze some 1" behind the door's shade.