Bay Window Roof Framing

First the instructions to find the ridge length is wrong.

Bay window roof framing.

A projection with four or more angled faces is a bow and cannot be calculated with easy rafters. This bay window rafter script will print out a chart of all rafter lengths and angles for the baywindow. It s wrong and just plain ugly. 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.

Step 1 plan and install the bay window. 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. It looks like diy built the bay window roof. This article explains how to lay out framing members with the help.

Framing a bay window roof it s only a small hip roof but its 45 degree corners befuddle many carpenters. 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. Roof framer s bible framing a bay window roof page 206 does not follow the holly grail of roof framing trigonometry and geometry. Most of the time a bay window will have a hip roof that s constructed using 45 degree angles.

Do not use this method to framing bay window roofs. 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. Framing a hipped roof for a bay window is harder than it looks. Before you get started with the roof the bay window itself needs to be in place.

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. We asked one of our veteran builders to show us how it s done. You ll also have to plan for the bay window roof. Plan carefully consulting with the architectural plans before commencing work.

Auto generated rafter tables for equal pitch bay window roof with 45 wall angles. But once the window its frame and its cap are in place you can get started framing the roof. It s time to finish planning the roof frame. The starting pitch is 3 12 and the ending pitch is 16 12.

Plan out the roof.