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Question DetailsAsked on 2/21/2018

how many bundle of shingles to do 16x80 moble home? There are 33.33 sq Ft per bundle.

Shingles are 33.33 sq Ft per bundle. Need to know how many bundles I need

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You can find a lot of similar questions, with answers on roofing issues, coverage, ballpark costs, etc in the Home > Roofing link, under Browse Projects, at lower left.

Assuming just a single ridgeline down the length of the roof without ridgelines, then you figure the actual square footage (assuming you are using manufacturer's standard tab exposure, not closing it up for greater blowoff resistance) of the roof area being covered, and unless buying special starter and ridge shingles, add the needed number of shingles for those in (taking into account the tabs are usually cut off for those, so ridge coverage is small per shingle when you factor in the overlap), then typically add 2-3% wastage/unusable cutoffs for a professional crew - more for amateur. If you have valleys or dormers or such then the cutoff wastes go up so normal wastage allowance might rise to 10% or more.

Not counting starter and ridge shingles and such, number of those shingle bundles needed including wastage allowance would be the square footage multiplied by 3/100, then after starter and ridge shingles being made out of stndard shingles are added to that amount, increase that total by the wastage allowance.

Better to have too many than not enough - see what the return policy at the store is regarding returning unopened bundles and for how long after purchase - I always recommend having the better part of a bundle for a small house, or a full bundle plus the leftover part of the last bundle used for a larger house, to be kept for repairs in the future. (Open leftover / partial bundles up and put waxed paper between the tar stripes and the underlying shingles so they don't bond together in storage).

Don't forget eave/rake edge flashing, and proper flashing or roof jacks or such for roof penetrations for vents and flues and such. And of course ice and water shield if in an area with snow/icing, and the water barrier too, as well as necessary fasteners for all those.

Answered 2 years ago by LCD

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