Dormer Roof Ridge Detail

Dormers add architectural interest accent and detail.

Dormer roof ridge detail.

This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. Of the gable end the 3 ft. On the dormer the flared roof helps shade the windows a boon when dormers face south or west in regions where summers are hot.

Dormers added in combination such as pairs fig. Some of these can support the roof and prevent ridge sagging and wall spreading. Measure and cut the temporary post that supports the ridge. The preferred setback should be at least.

The dormer ridge roof junction requires a two part custom made flashing see figure 2 that goes under both the main and dormer roofs and over the valley flashing. Stretch the tarp out until it overlaps the roof ridge. Whenever possible begin trim installation at the downwind end of the roof farthest away from the source of prevailing winds to al low flashing laps to face away from wind driven rain. Acquire a heavy duty tarp that is large enough to entirely cover the roof.

Refer to the details. Snap lines for the rafters then draw in the ridge and soffit detail. Rule in total length. A dormer that springs from a line below the primary roof ridge clearly appears subordinate to the primary roof and is less likely to overwhelm the roofline.

The new design features can look good inside too. Intricate corbels support the overhang of the roof. This is basically a gabled dormer but the dormer roof flares out in the same way that the main roof on a house often flares out to accommodate a porch or an addition. Rule would allow the dormer to extend within 3 ft.

Collar ties rafter ties tension beams structural ridge beams. In general a 11 2 story house with a roof pitch of 8 in 12 or steeper is suitable for a shed dormer. For smaller buildings where the 15 ft. 5 affix the tarp to the roof screwing a 2 by 4 5 08 by 10 16 cm over it.

Valley gutter dormer roof junction a valley gutter see figures 1 and 3 collects water from the main roof and the dormer roof. Cut a common rafter for a pattern and lay it on the drawing to check for fit. You don t have to understand all the technicalities of rafter cutting to build the dormer roof. 12 should not exceed the 15 ft.