Framing A Pitched Roof Over A Flat Roof

Of course you don t need to live in a modern house to deal with a flat roof.

Framing a pitched roof over a flat roof.

How to install a roof over an existing roof. Make sure the pitch of the trusses is the pitch that you want for your new roof. You ll have to find the secondary roof hip pitch the same way you found the main roof hip pitch as in figure 3b. The hip pitch in relation to the secondary roof measures out at 9 5 8 18 13 16.

Building a pitched roof over an existing flat roof it depends on a lot of variables like the condition of the existing flat roof including the state of the joints and the material its made of. A common house roof pitch is 5 by 12 which means it slopes up from the wall at 5 inches per foot. That s a simple low cost solution that can tie in well with the main house. Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape.

Premade trusses will form the skeleton of your new roof above your old roof. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option. Chapter 8 includes specifics for such things as allowable lumber to use the moisture content of fire retardant treated wood allowable rafter spans and use of. These requirements cover the design and construction of roof ceiling systems including roof framing roof drainage roof sheathing ceiling finishes roof ventilation and attic access.

This is a completion video of a flat roof framing. If the structure contains windows then you ll need a low pitch for example. If excessive damage is present you might not be able to do this at all. Repeat the same procedure on the side of the hip that faces the secondary roof using the hip pitch for that roof and measuring distance b.