I'm 6-3 320lbs. Got half way up the ladder, climbed down and noticed the ladder is rated for 300lbs. No idea what the roof is rated for. Stay low, stay on hands and knees will be my choice. 3-4 points of contact better than 2 as it spreads the weight out. I'll be inspecting my roof in a few weeks during winterizing process. IF I fall through, I'll sell you my 320RS for a great price.