If you are planning a roof replacement, the first question is usually simple: how big a bin do I need? The honest answer depends on two things most people overlook. One is the weight of the old shingles. The other is how many layers are on the roof right now. This guide explains both, and shows which size works for which roof, so you can rent a disposal bin once and get it right the first time. Why Shingles Are Heavy: Weight, Not Volume Most homeowners judge a bin by how much