Wet snow can weigh as much as 21 pounds per square foot, according to the Federal Emergency Management Agency (FEMA), and a snow roof rake is the most effective means of removing that weight.

Swiss police officer shovels snow on a roof top of a hotel, the day before the opening of the 42nd Annual Meeting of the World Economic Forum, WEF, in Davos, Switzerland, Tuesday, Jan. 24, 2012 .

So generally, when you get about to that 18 to 24in of snow on your roof, that’s, that’s the time that you want to get it out of the way for you.” After a warm day with snow melting once the ...

“There’s a couple feet up there of snow that we’ve been removing from people’s houses. The weight load alone too is a lot,” says Mike Graham, owner of Michael C. Graham Construction.