Bay Window Roof Framing

By scott mcbride issue 129.

Bay window roof framing.

Once the window the window frame and the window cap are all in place and have been secured and insulated you can get started on framing. A projection with four or more angled faces is a bow and cannot be calculated with easy rafters. Do not use this method to framing bay window roofs. This bay window rafter script will print out a chart of all rafter lengths and angles for the baywindow.

Framing a hipped roof for a bay window is harder than it looks. The starting pitch is 3 12 and the ending pitch is 16 12. We asked one of our veteran builders to show us how it s done. Plan carefully consulting with the architectural plans before commencing work.

Before you get started with the roof the bay window itself needs to be in place. This article explains how to lay out framing members with the help. First the instructions to find the ridge length is wrong. Then miter 4 joists at a 45 degree angle on both sides and install them around the exterior opening of the frame to reinforce it.

But once the window its frame and its cap are in place you can get started framing the roof. Bay roof a bay roof is a three sided roof framed against a vertical wall of a building usually covering a projection from the building such as a bay window or breakfast nook. Plan out the roof. Drawing bay roofs out full scale is key to fast and accurate framing.

The secret to a good looking roof is having the right proportions. Unlike a traditional hip roof the roof over a bay window with 45 degree sides is based on an octagonal roof but most people don t know how to frame an octagonal roof. It looks like diy built the bay window roof. Roof framer s bible framing a bay window roof page 206 does not follow the holly grail of roof framing trigonometry and geometry.

Auto generated rafter tables for equal pitch bay window roof with 45 wall angles. To build a roof cab construct a wood frame out of 2 by 4 ft 0 61 by 1 22 m boards that matches the base of your bay window s roof and mirrors the shape at a 90 degree angle on your wall. Framing a bay window roof it s only a small hip roof but its 45 degree corners befuddle many carpenters. Most of the time a bay window will have a hip roof that s constructed using 45 degree angles.

You ll also have to plan for the bay window roof.