Framing A Pitched Roof Over A Flat Roof

While that s the easiest route it s certainly not your only option.

Framing a pitched roof over a flat roof.

Pitch also has its own denotation determined by the rise in inches in 12 inches. Slanted roofs which come with 2 angles meeting in the center are known as pitched roofs while the ones with a single slant are known as skillion roofs. 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. Pitch for a gable roof the most common is generally 1 4 or 1 3.

According to improve net s online roofing calculator a flat roof is significantly cheaper than a pitched roof. Pitch can vary a great deal from a shallow slope up to a very steep pitch. 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. This new roof with a higher pitch can be accomplished with premade roof trusses and typical asphalt shingles.

Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. If the structure contains windows then you ll need a low pitch for example. 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. For instance a 4 12 pitch denotes.

Which is equal to 1 4 or 1 3 the total span of the building not counting any overhang. 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. Additional valleys angles and gables can be built into converted roofs as well but adding these elements may affect your project. Snow and rain which usually pile up on a flat roof run off the slanted roof thus prolonging the lifespan of the roof.

Created with wondershare filmora. 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. I show how i construct it showning in detail how to do the lead flashing. Blind valleys simplify framing.

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