Calculate 20 per cent more for 7 12 to 10 12 pitches and 30 per cent more for a pitch that is 11 12 or greater.
How to access a roof vent on a sloped roof.
Ice dams occur when snow melts on a roof runs down the roof s slope and freezes at the eaves.
Dry fit the duct work assembly that will run from the dryer to the roof.
Access the roof and locate the nail where the shingles.
If the slope of your roof is greater than 6 12 you will need more ventilation to reflect the extra volume of attic space.
The possibility of slipping and falling makes working on any roof dangerous but it s especially so if the roof rises more than 4 feet for every 12 feet of.
Draw a circle around the perimeter of the duct work onto the underside of the roof sheathing.
Water expands as it freezes and these patches of ice can damage roofing materials and cause leaks.
Also the nfa will be calculated differently if your roof slope is greater than average.
Drive a nail upward through the roof from the inside to mark the center location of the vent.
Ways to work on a steeply pitched roof.