I have been thinking of running some radiant wire under the metal in case of real heavy snow. We dont get it often, but when we do it is usually followed by heavy rain which makes for a lot of weight in a short period of time.
No kidding...the heavy snow load is what started all this
I have a little 21 foot boat with a universal cover on it
I had made a frame out of 2x4s, doubled up to keep the cover from sagging into the cockpit of the boat
I guess we got so much snow this winter that the doubled up 2x4s broke under the weight
