Framing Roof Over Bay Window

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 roof over bay window. It s time to finish planning the roof frame. First the instructions to find the ridge length is wrong. For as long as architects have been drawing bay windows carpenters have been scratching their heads over how to frame the roofs. Plan carefully consulting with the architectural plans before commencing work.

We asked one of our veteran builders to show us how it s done. Step 1 plan and install the bay window. 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. But once the window its frame and its cap are in place you can get started framing the roof.

Some require support from below using brackets or a knee wall. Framing a hipped roof for a bay window is harder than it looks. 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. Do not use this method to framing bay window roofs.

Before you get started with the roof the bay window itself needs to be in place. You ll also have to plan for the bay window roof. This article explains how to lay out framing members with the help of full scale graphic templates. Some units also require support from above using cables that attach to framing members in the eaves or the wall above.

It s wrong and just plain ugly. Plan out the roof. A bay unit attaches like a standard flanged window but with some important differences. Most of the time a bay window will have a hip roof that s constructed using 45 degree angles.

In this video rick arnold shows us his simplified method for laying out and building a bay roof. Some need both types of support.