Now most 3 tab shingles typically referred to as metric shingles are larger.
Size of roofing shingle.
Contractors start at the bottom of the roof and work across the roof s surface and up.
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The proper shingle exposure can depend on the size of the shingle its material and the desired look of the roof.
Iko was among the first roofing material manufacturers to introduce the metric size roofing shingle defined as being 13 1 4 inches long by 39 3 8 inches wide.
Today strip shingles are used most often used by home builders that manufacture inexpensive homes or by homeowners who are replacing roofing shingles on residences that already have strip shingles on the roof.
In the past most 3 tab shingles were imperial sized at 12 inches wide and 36 inches long with an exposure of 5 inches.
Metric shingle exposure is proportional to their larger size commonly 5 5 8 inches.
When installing asphalt shingles on felt only to any grade decking you should use 1 inch long roofing nails.
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However 39 3 8 inches is the equivalent of one meter.
These are still considered standard asphalt shingle dimensions.
Admittedly it s rather confusing to call a shingle metric and then proceed to define it in imperial measure.
Some roofing shingles such as duration are applied with a 6 1 2 inch offset and a 5 5 8 inch exposure over a prepared roof deck.