Install Rafters Over Low Slope Roof

Use a framing square to help lay out the notch based on the slope of the roof.

Install rafters over low slope roof.

Building installing roof rafters. Are the rafters built using roof trusses a. Roof pitch is the measurement of roof steepness. A 2 4 wall with a 2 6 rafter can be notched for a 4 seat.

Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option. For our 4 x8 lean to example using a 2 4 rafter the depth of the birdsmouth is limited by the 1 3 depth of the rafter rule. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof.

Then nail two pieces of 1 by or 2 by lumber of the same width as the rafters as show at left and about 18 inches long centered over both sides of the splice. How to install a roof over an existing roof. To do this butt the ends of the rafters together over a supporting beam. There are lots of ways to insulate a low slope roof and most of them are wrong.

Learn more about common installation practices for low slope residential applications including why owen corning deckseal roofing system is a preferred choice. Or join the members using manufactured metal splice plates. If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch. The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof.

Premade trusses will form the skeleton of your new roof above your old roof. Does this diagram look like a good approach a. Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging. The way pitch also known as roof slope is measured is rise over run.

First check with your roofer that the type of metal roofing that you intend to install can be used on a low slope roof. So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 4 12. Don vandervort hometips. How to build a shed roof step by step.

You ll need 8 or 9 inches of cellulose to get r 30.