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Yes, shingles can cause all of these problems and more.
A foot span is a term used in the roofing industry to calculate the area of a roof. It is necessary to calculate how many shingles per foot. This measurement will vary depending on the type of shingles used.
The most common shingles (three tab), come three packs per 100 square feet or a 10 foot by 10 foot area. The timberline shingles can come in 4 packs per square, and high end shingles can be 5 or 6 packs per sguare.
54.
2.7 lbs.
One square of shingles covers an area equivalent to a 10 foot square, or 100 square feet.
Six 'squares' will do it and leave a few spare.
3 inch per foot is usually the lowest pitch for shingles. For only 1/4 inch slope, rolled roofing should be used.
20 squares or 60 bundles
on the top of the foot.
The GAF roofing supply company sells top-of-the-line Timberline asphalt shingles. These shingles come in a variety of colors and styles for one to choose from.
The condition of the shingles and wood underneath help to determine this. If the wood is good and shingles are mostly still there, some cities allow two or three roofs on top of each other before all of the shingles must be removed.