How To Do Slope Over Flat Roof With Plywood

You can read our article about calculating slope for information on the various roof slope notations.

How to do slope over flat roof with plywood.

This is the basis for calculating the angle which is approximately a 1 19 degree slope. For example fill a 1 inch slope across 8 feet by. Once the cement is spread across the roof it s time to place the second layer down. Find the area of a roof.

Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed. To find the amount of plywood needed to cover a roof start by finding the area of the roof. As mentioned above place the first 6 inches 15 cm of the second layer on top of the first layer. And their horizontal lines abound in the west and in urban areas.

The slope on a flat roof is too small to shed water and the shallow slope tends to collect leaves and debris that act like dams. Place strips of plywood across the floor to fill deeper slopes increasing the thickness of the plywood at regular intervals to correct the slope. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof in square feet. Apply roofing cement and secure the second layer to the roof.

Traditional homes often have sections of flat roof over shed dormers above porches and garages and on balconies. According to the international building code the typical built up flat roof that uses tar or asphalt goes by the guideline that for every foot 12 inches of a flat roof a minimum of inch must step up or down. The minimum slope for a flat roof is 1 4 per foot or 1 4 12 but some owners or insurance companies require a minimum slope of 1 2 per foot. A sloped roof is more capable of removing water from the building s exterior and can be an attractive alternative to the flat roof.

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