All certainteed three tab shingles are made to have a dimensional tolerance size of 1 16.
Three tab roofing instructions.
2 malarkey 3 tab shingle installation instructions 2 4 overlap depending on product full width sheets roof deck eave metal single layer of specified underlayment rake metal installed on top of underlayment figure 1 application of field underlayment on roof slopes 4 12 and greater non ice dam regions roof slopes 2 12 up to 4 12.
All of these shingles are good or better quality roofing products.
Cut full three tab shingles into three 12 x 12 13 1 4 x 13 1 8 metric hip ridge shingles.
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Start hips at the eave and work up to ridge.
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The 250 mm 10 length is bent in half so that 125 mm 5 will reach up the wall surface and the other 125 mm 5 will extend onto the.
This means that when offering a choice of good better and best products these shingles would fall in the good or better categories.
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Additional starter rows install along the gable.
How to do it.
Install a starter strip.
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Continue to chalk additional guidelines based on the width of the shingle through at least four courses rows across.
Apply ridge only after hips have been applied beginning on end of ridge opposite prevailing wind direction.
For instance when using metal flashing with shingles with a typical 143 mm 5 5 8 exposure such as traditional 3 tab shingles the size of the flashing will be 250 mm x 200 mm 10 x 8.
If possible have the shingles delivered via a boom directly onto the roof.
Cut a half tab off for your first course shingles cut off a full tab for your second course shingles cut one and a half tabs off of your third course shingles cut two tabs off your fourth course shingles for your fifth course cut off half of the final tab keep your sixth course tabs intact.
If cutting three tabs for hip ridge shingles adhere to the following instructions.
Three tab installation starts at the edge of the roof with narrow starter strip shingles that run along the bottom flush with the gutter apron.