Two Roof Plate Heights On Same Side

Typical roof pitches are 6 12 12 12 in pitch and are called out on every elevation of the house corresponding to the pitch on the roof plan.

Two roof plate heights on same side. The height above plate for the hip rafter is the same as for the secondary roof common rafters since the hip falls on the secondary roof plate. I came up with 291 11 16 for the back and 267 15 16 for the front giving me a difference of 23 3 4. The right roof was drawn at a lower plate height and is separate. To lay out the plumb cut take measurement b from the full scale drawing figure 3c and transfer its dimensions to the rafter on both sides of the centerline of the birdsmouth as shown in.

After a taking some measurements and doing a bit of ciphering we established that the steepest pitch we could use on the porch roof was 4 in 12. When you draw a roof it only allows one plate height. Cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof. We wanted to make the porch roof as steep as possible while keeping the peak of the roof below the wall to roof intersection at the top of the shed roof.

If i draw three separate roofs they don t join and clean up automatically. While raising wall heights can indeed make the fascia line up all other things being equal it would make the ridge heights differ by the same amount. Elevation markers elevations markers are dashed lines that show where the floor and plate the top of the framed wall lines of each level correspond to the elevation. Its a matter of choosing where to compromise in a selection of geometric constraints.

They form an upside down v with the point at the top of the addition roof. The left wing roof is drawn at the same height as the main roof just to show how they should unify but i want it lower. The image shows how it should probably look. I then did the calculations again using a different span same pitch and also came up with a difference of 23 3 4.