Framing A Pitched Roof Over A Flat Roof

Pitch for a gable roof the most common is generally 1 4 or 1 3.

Framing a pitched roof over a flat roof.

To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge. A 900 square foot flat roof in the san francisco area made of concrete tiles costs. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. This new roof with a higher pitch can be accomplished with premade roof trusses and typical asphalt shingles.

Most homeowners choose to convert a flat roof to a pitched one using a simple trussed roof with two angled planes. Additional valleys angles and gables can be built into converted roofs as well but adding these elements may affect your project. 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. I show how i construct it showning in detail how to do the lead flashing.

Blind valleys simplify framing. 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. Using a pitch measuring tool that i d made we also determined that the exact pitch of the shed roof was 3 1 2 in 12. Pitch can vary a great deal from a shallow slope up to a very steep pitch.

If the structure contains windows then you ll need a low pitch for example. Created with wondershare filmora. This is part two of the porch build where i am doing the roof. While that s the easiest route it s certainly not your only option.

Snow and rain which usually pile up on a flat roof run off the slanted roof thus prolonging the lifespan of the roof. For instance a 4 12 pitch denotes. Replacing a roof can be expensive but if a roof contains only a small slope it s possible to raise the roof pitch of a house by building a roof over the old one. According to improve net s online roofing calculator a flat roof is significantly cheaper than a pitched roof.

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