How To Measure For A Gambrel Roof For Steel

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How to measure for a gambrel roof for steel.

Calculate gambrel angles with graph paper and a protractor. Enter the diameter of the roof ridge vent gap 1 3 finally enter the coverage area width of the panels you plan to buy. Remember it doesn t have to be to scale or look pretty. How to put a metal roof on a gambrel roof.

You will need this many pieces for a single sloped roof or each of the 2 slopes of a gable roof or 4 slopes of a barn style gambrel roof. Install the first sheet with one long edge. The metal roof length calculator calculates the distance from peak to trim so add the length you want the roof metal to extend beyond the eave trim. For instance a 38 panel will have an effective coverage width of 36.

Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. Replace any sections of damaged decking using material of a similar thickness and type. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. Measure 4 total pieces of 5 inches 1 3 cm thick osb or plywood.

Start at one lower corner along the gambrel end. These pieces should be half the length of your structure and the width of each piece of your rafter. Find out how wide each piece of metal is then divide the width of the roof by that number. The preview drawing displays a dimensioned elevation view of the gambrel roof.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. So for example if your barn is 10 by 12 feet 3 0 m 3 7 m each piece of osb should be 6 by 3 83 feet 1 83 m 1 17 m. For a barn style gambrel roof you will need flashing at the top and the 2 middle points where the roof slopes meet. Draw a semi circle on the graph paper mark a center peak at the top and draw two lines on each side in the shape desired for the gambrel roof.

To calculate a gambrel roof select gambrel roof from the roof type dropdown list or click on the appropriate toolbar button to calculate a gambrel roof. Measure and cut osb or plywood for the roof sheeting. It does have to contain all the straight lines of your roof and an accurate measurement of those lines. Gambrel installation subscribe to our page for more metal roofing videos.

Tear off any old roofing down to the decking.