Tie In Unequal Gable Roof Heights

The 2015 international residential code does not require collar ties or collar beams.

Tie in unequal gable roof heights.

Collar tie is a colloquial term for collar beam. Another by product of this roof configuration is varying soffit heights and widths which require further design decisions. I used will holladay s a roof cutter s secrets pp. We began by tearing off the shingles and removing a skylight from the shed roof.

I then did the calculations again using a different span same pitch and also came up with a difference of 23 3 4. This first video shows how the finished roof planes in off angle roof construction will look when completed. 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. Using the square breaktool click the roof edge in the approximate area where the new roof section will tie in.

This will place a break line on the roof edge as seen below. 240 241 to calculate my front and back common lengths. 1 tie a new gable or hip roof to an existing gable or hip roof with valley rafters which perform the same function as ledgers. To maintain a consistant ridge height in these situations the roof pitch must be adjusted.

For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17. In a hip roof with equal pitches the unit run of a hip or valley rafter is 17 inches for every 12 inches of run in the main roof. But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons. Rafter tie a tension tie in the lower third of opposing gable rafters that is intended to resist the outward thrust of the rafter under load.

Once the largest roof section is completed use the square breaktool and ctrl dragto add the additional sections of roof overbuilds. Strip the roofing from the old roof at the connection point to. Butt the first new truss against the old one. A tension tie in the upper third of opposing gable rafters that is intended to resist rafter separation from the ridge because of wind or unbalanced roof loads.

My business partner and i recently added a large screened in porch with a gable roof onto a client s home. Then mount new trusses on the new addition walls. The porch joined the house at right angles to a shed roof section.