Run Down Roof

How water runs off a roof depends on the amount of rainfall and how quickly it needs to drain.

Run down roof.

The drainage system of any roof can be located at the edge or in the middle of the roof. The top of the. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. For example soak the downhill side of a chimney first then each side then the top on both sides.

Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10. Typically low slope roof assemblies are composed of three interrelated components. Tie the top to the siding or fascia and the bottom to the siding so it can t slip out while you re on the ladder. The same roof has a 4 12 or 1 3 pitch.

Water should run down the side of the flashing and be directed to the shingles instead of finding its way into the roof deck. The roof system is defined as the roof membrane including surfacing and the roof insulation. A measurement of roof area that equals 100 square feet an area 10 feet by 10 feet. Measure the rise of your roof.

Set up an extension ladder so you can climb safely onto the roof. The roof assembly is defined as the roof deck along with the roof membrane and roof insulation. Let s say it is equal to 1 5 m. Calculate the roof pitch as the proportion of rise and run.

The total run is the distance from the peak to the edge of the roof which in this case is the total width divided in half which is equal to 10 feet or 120 inches. Things needed metal drip edge table or sawhorses 80 grit sandpaper spray paint to match the shingle color tape measure marker straightedge tin snips ladder hammer galvanized roofing nails silicone sealant. For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. Slope a roof s slope is the number of inches it rises for every 12 inches of horizontal run a roof with a 4 in 12 slope rises 4 inches for every 12 inches of horizontal run.

Calculate the rafter length substituting these values into the following formula. How to find a leak in a roof may be the hardest part of fixing a leaky roof. If there were no flashing against these walls water could slowly drip into the crevice between the wall and the roof and potentially into the home. By gary hedstrom peg hedstrom judy ondrla tremore.

Pitch rise run 1 5 6 25. Have your helper stay inside the house waiting for the drip to appear. Finding the actual spot where the roof leaks is difficult because water can enter the roof in one place and run down to another before it starts soaking into the ceiling.