Install Rafters Over Low Slope Roof

There are lots of ways to insulate a low slope roof and most of them are wrong.

Install rafters over low slope roof.

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. 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.

Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging. 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. Or join the members using manufactured metal splice plates. How to install a roof over an existing roof.

To do this butt the ends of the rafters together over a supporting beam. You ll need 8 or 9 inches of cellulose to get r 30. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof. Building installing roof rafters.

Don vandervort hometips. Place corner pieces where panels will meet bends at the edge of the roofing. 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. 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.

A 2 4 wall with a 2 6 rafter can be notched for a 4 seat. In older buildings the usual method is to install fiberglass batts or cellulose on top of the leaky ceiling with a gap of a few inches or sometimes a few feet between the top of the insulation and the roof sheathing. Are the rafters built using roof trusses a. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.

Does this diagram look like a good approach a. How to build a shed roof step by step. Roof pitch is the measurement of roof steepness. Some types of metal roofing can t be installed on a 1 12 roof.

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