How To Convert Existing Truss Roof Flat Ceiling To Vaulted Ceiling Using Rafters, Post and Beam
Greg again, warns that converting a truss ceiling into a cathedral ceiling is not an easy job and it’s recommended to consult with an engineer before starting this project, as there are many factors to consider including the existing framing and how the trusses are engineered.
Here are the steps on how to convert a truss ceiling into a cathedral ceiling following the video instructions:
Identify the trusses and the blocks in the ceiling. The trusses are typically engineered with blocks at the ridge, over the walls, and lookouts which are 2x4s cut in.
Leave the trusses in place and don’t cut them until the new framing is installed to support the roof.
Install temporary support walls made out of 2x4s to support the roof rafters while the trusses are being modified. These temporary walls can be screwed or nailed to the trusses.
Cut the rafters to size. The speaker recommends making another video on how to properly size the rafters, but warns that the existing seat cut on the trusses might not work and will need to be modified.
Install the rafters. The rafters should be installed on each side of the trusses with a gap left for the beam to slide in. Nail the rafters to the trusses according to the engineer’s specifications.
Create a notch in the block on top of the wall if needed for the finish on the outside.
Remove a section of the trusses where the beam will be placed. The speaker recommends removing a small section to allow the beam to slide in on top of the bottom cord of the truss.
Slide the beam into the attic area created by removing the section of the truss.
Install a 2x4 or 2x6 or 2x8 on top of the beam, depending on how high you need to raise the beam. This board will be used to jack up the beam into place.
Jack up the beam into position using a level to make sure it’s straight.
Use 2x4s to create a saddle to support the beam while jacking it up. This will prevent the beam from moving around.
Once the beam is in position, secure it to the posts and the rafters using nails, hangers, or framing angles.
Greg also recommends not removing the blocks that are part of the roof sheathing diaphragm nailing unless you are also going to replace the plywood.
Consult with an engineer throughout the process to ensure that your modifications are safe and up to code.
Greg acknowledges that there are other ways to complete this project and that he will be making another video to address some of the other challenges you might encounter.
