Framing A Flat Roof Addition

To keep water from pooling at these inside corners tom rips 2x4s lengthwise on a 45 degree bevel with a table saw.

Framing a flat roof addition.

Frame the roof one important and perhaps not so obvious fact is that a flat roof is not actually flat. Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof. When matched to the angle and proportions of other rooflines on the house your gable roof will add visual interest and character to the home making the addition look like an asset that belongs with the house. Add the plywood once you ve added the framing it s time to add a layer of 5 8 inch plywood sheathing.

Tying in a flat roof addition makes it possible to extend and add to your existing property without affecting the look of it. If done properly the flat roof can be tied in so that it doesn t change the look of the house at all. Rather than a single slope a gable roof consists of two slopes that meet at a peak running down the middle of the roof. The rise or height of the roof at its peak is the altitude of the triangle.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. The original roof had no overhang. The third tactic for your house addition is to expand an upper level out across an existing one story section such as a flat roof garage or porch. So this is why we left the plywood long utilizing the full 8 sheets.

And the line length measurement from the roof peak to the building wall is the hypotenuse. This will seal the parts of the roof together and reduce the risk of leaking. Connect a flat roof to a sloped or pitched roof with a ledger board. Roof overhang with a new cornice will make this building look like it was added on in 1900 not 1960.

Another is to sever the existing roof around the edges and lift it off temporarily then put it back in place after the new level has been framed in. This addition looks like a floating box. The 8 step process for diy installation step 1. Here the rubber roof will need to run up the walls and glue to the sheathing.

Step 1 plan.