Determine the direction.
How to square a roof for tin.
Use measuring tools to find the length and width of the roof from the ground outside.
If any roof diagonals are long run a cable and come along from truss peak to opposite corner column along purlin underside.
Http bit ly 2cabbws all videos from beginning.
4 find the square footage by adding up the total for each section.
As the roof steel is installed you will notice the building becoming very stiff.
Make sure the walls are square.
Slope is calculated as rise over run.
Downside to this would be obviously the taper in the first and last panel.
Figure out the slope of the roof by setting a carpenter s level on the underside of one rafter in the attic.
Do this by measuring three feet out from the corner along one wall and marking it accurately.
Work from a stepladder and inspect all bolted connections at the upper ends of each corner post or corner assembly.
How to square a metal roof.
A very small tug can change a diagonal drastically.
This is the width of the building between both outside supporting walls.
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For example if your roof measures 10 feet 3 0 m x 10 feet 3 0 m and the slope of the roof is 12 12 giving a slope factor of 12x12 12x12 12 converts to 1 414 in decimal form you would multiply 10 x 10 x 1 414 to get the total of 141 square feet of roofing.
Measure the span of the roof.
Cut angle on every sheet at the bottom.
Downside to this would be a non factory sealed cut exposed to the weather.
Install square to drip edge and run it out of parallel allow flashing to cover difference.
Measure the vertical distance rise from the 12 inch mark on the level run to the underside of the same rafter.
Pull slowly until dimensions are equal.
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