Install Rafters Over Low Slope Roof

Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.

Install rafters over low slope roof.

Place corner pieces where panels will meet bends at the edge of the roofing. Don vandervort hometips. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. Building installing roof rafters.

There are lots of ways to insulate a low slope roof and most of them are wrong. Premade trusses will form the skeleton of your new roof above your old roof. Or join the members using manufactured metal splice plates. Does this diagram look like a good approach a.

First check with your roofer that the type of metal roofing that you intend to install can be used on a low slope roof. To do this butt the ends of the rafters together over a supporting beam. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof. The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof.

Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging. 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. 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 way pitch also known as roof slope is measured is rise over run.

Learn more about common installation practices for low slope residential applications including why owen corning deckseal roofing system is a preferred choice. Roof pitch is the measurement of roof steepness. 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. How to build a shed roof step by step.

How to install a roof over an existing roof. You ll need 8 or 9 inches of cellulose to get r 30. Some types of metal roofing can t be installed on a 1 12 roof. A 2 4 wall with a 2 6 rafter can be notched for a 4 seat.

Are the rafters built using roof trusses a.