How To Size Roof For Shingles

The more common roof thickness is 3 4 inch decking.

How to size roof for shingles.

A square of shingles is the number of shingles needed to cover 100 sq feet of roof area. However shingles are packaged in a way that they are light enough for the average person to carry around. To find the squares divide the overall roof area by 100 and then round up. This is simply 100 square feet of roof.

Required measurements include the following. To use this method you will need to measure the length of the eaves on each of the roof planes. Cut six inches off the length of the first starter shingle nailed on then use the rest of them full size. For instance if the roof is 1550 square feet then it is 16 squares.

Of the old shingles have not been removed from the roof you can easily use this method to calculate the number of shingles you are going to need. Hold the end you measured from against the bottom of a rafter so it s sticking straight out horizontally and is level. The specifics of how shingles are laid on your roof vary by manufacturer. Snap a horizontal chalk line over the starting row to use as a guide.

How shingles are installed. When installing asphalt shingles on felt only to any grade decking you should use 1 inch long roofing nails. Measure the pitch of your roof in the attic. Mark a length of 1 foot 0 30 m on a long level starting from one end.

A square simply refers to a 10 x 10 square of roofing. 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. Lay the first row of shingles directly covering the narrow starter row. From the 1 ft 0 30 m spot you marked on the level measure upward to the rafter.

Multiply the width and length measurements together to determine the area. Add the areas of each section together. Then each measurement is recorded on the diagram applicable to that roof surface. How to measure for roof shingles.

Contractors start at the bottom of the roof and work across the roof s surface and up.