Roof Slope Overhang Details

Always try to carry membrane felts over or up and over and down to ensure the roof membrane will always drain free and clear of any adjacent system.

Roof slope overhang details.

At the rakes however with a nod to yankee frugality and clean modern lines we kept the roof trim as close to flush as practical while still allowing for a rain screen channel ventilated at the top as well as the bottom. Membrane recommendations for these roof systems for various slopes. The profile is the shape taken by the sheets when you bend them to form panels. Express the slope of a metal roof by a ratio which indicates the pitch of the roof.

Eave overhang detail with that in mind we kept a roof overhang at the eaves as it provides a nice shadow line and protects the second floor windows from a bit of the summer sun. This leads to a situation where there is an excess amount of shade and the exterior of the home appears dark and gloomy. I e 4 inches of rise per 12 inches one foot of run. Another approach is to build a cupola or ventilated doghouse in the middle of the low slope roof an approach championed by joe lstiburek.

The roof overhang does not extend far enough. Position the square at the end of the rafter board with the tongue on your left and facing away from you. On the front of the roof edges of the roofs the overhangs were extended to hide the thickness of the roof insulation photograph 10. Roof slopes are most commonly defined by the rise over run ratio.

3 12 1 2 12 and 1 4 12. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. In the first case the overhang is simply too big for the home. In all cases it is important to properly detail and install the edge conditions.

The original rafters are extended but original roof deck sheathing cut back to be flush with the original wall sheathing. The minimum slope of a roof depends on the roof s profile. If the upper edge of a low slope shed roof intersects a vertical wall the most logical approach in my opinion is to detail the roof as an unvented roof. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12.

There are two common problems encountered with roof overhangs. Add the length of the overhang beyond this mark and. The most common slopes are. Metal roof slope is expressed by a ratio indicating the roof pitch which notes the vertical rise of the roof in inches for every 12 inches the roof runs horizontally in other words dividing the vertical rise and its horizontal span.