If you re not sure how many bundles of shingles are on your roof you can also estimate shingle weight by the square.
How many tons does a roof weigh.
60 squares or 6000 sq feet.
45 squares or 4500 sq feet.
Metal roof systems in most cases weigh between 1 to 3 pounds per square foot.
Moisture transport through building walls and roofs moisture will flow through a wall or roof if the vapor partial pressure is higher on one of the sides rainfall draining of roof areas and vertical downspouts capacity of vertical downspouts when draining roof areas in rainfall.
Architectural asphalt shingles weigh 65 80 pounds per bundle.
Snow won t slide off.
Three tab asphalt shingles weigh 50 80 pounds per bundle.
30 squares or 3000 sq feet.
Ft kilograms per square meter kg m 2 source.
That s more than 22 tons.
With metal roofing weight on a structure is never an issue.
Pounds per square foot lb ft 2 pounds per square 100 sq.
Slate roof shingles weigh much more sometimes over 300 pounds per bundle.
These are the weights of typical actual products.
Flat roofs may be especially vulnerable to roof collapse depending on its engineered design load.
Asphalt shingles 3 tab or strip 1 95 lbs.
Weight of roofing materials.
Two feet of snow on a roof with a footprint of say 28 40 feet could weigh 45 000 pounds.
The weights of other actual products of the same type may vary.
90 squares or 9000 sq feet.