Don't waste your money. I bought a bucket on-line and a bucket locally. Tossed them up onto the roof fairly close together after getting rid of a lot of snow with the roof rake. I waited... threw up the second bucket at close intervals... and waited.... Two weeks later I'm still waiting. My next try is to use old panty hose or knee high's and fill with ice melt. I'll toss those up where the ice is and then I'll wait.