It would depend on the type of shingle you choose, 15yr., 20yr., 30yr.,40yr. The higher the year wear the heavier the shingle
what is the weight of a sq of 3 tab and a sq of arutectural shingles
A bundle of shingles weigh ~ 80lbs, so it depends if you are using 3-tab or architectual shingles. There are usually 22 shingles in a bundle of arch. and 26 in a bundle of 3-tab. Doing the division and arch shingle weighs ~3.63 lbs and a 3-tab weighs ~3.08lbs. The weight will very depending on the brand and style of shingle as well... Hope that helps you...
21
Shingles are rated in pounds / 100 square feet. Typical ratings are 235# or 265#. 1 bundle of shingles covers 1/3 of 100 sq feet. 235# shingle / 3 = 78.33 lbs
Either 25 sq ft if is is a 4 bundle per square shingle or 33.3 sq ft if it is 3 bundle per square shingle. A square is equal to 100 sq ft.
36 inches long. Each tab is about 12 inches long.
Depending on which manufacturer of starter shingles you prefer, you will get 100 linear feet, give or take a couple of feet for some brands. If using 3-tab shingles as a starter shingle, you will get roughly 78 linear feet per bundle.
Three bundles per square
About 80 lbs.
Retail, by the bundle. For bidding a job, by the square 3 or 4 bundles per square depending on the type of shingle.
30 by 40 = 1200 sq.ft. divide by 10 = 12 square 3tab and arch shingles are 3 bundle per square 12 sq. x 3 bundles = 36 bundles 3tab = 26 shingle per bundle arch = 22 shingle per bundle 36 bundle x 26 = 936 3tab shingles 36 bundle x 22 = 792 arch shingles =)
Complete instructions should be included on the shingle package, but essentially what you will be doing is placing the top of the new shingle against the bottom edge of the old shingle, assuming the exposure of the shingles is the same.