Cost to Reroof a House
Chances are, your roof structure was designed for a dead load of one layer of shingles, plus extra for snow and a safety margin. Installing new roof shingles over old effectively doubles the weight of the roofing, so you have to make sure your roof structure can handle the extra load. That’s also why building codes commonly limit re-roofing to no more than two layers. On some houses, the extra weight of multiple layer causes the roof sheathing (decking) to sag between the rafters or trusses.
The number of bundles or squares you need will depend on the surface area of your roof, and its pitch or slope. For example, a 2,000-square foot roof will Commercial Roofing Brisbane require 20 squares or 60 bundles. A professional will likely purchase slightly more materials than necessary to ensure there is extra material if needed.
Roofing materials alone … Read More