Tie In Unequal Gable Roof Heights

We designed the porch with wide overhangs for shade from the hot north carolina summer sun.

Tie in unequal gable roof heights.

This will place a break line on the roof edge as seen below. Another by product of this roof configuration is varying soffit heights and widths which require further design decisions. My business partner and i recently added a large screened in porch with a gable roof onto a client s home. 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.

240 241 to calculate my front and back common lengths. 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. Using the square breaktool click the roof edge in the approximate area where the new roof section will tie in.

This first video shows how the finished roof planes in off angle roof construction will look when completed. The porch joined the house at right angles to a shed roof section. 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. To maintain a consistant ridge height in these situations the roof pitch must be adjusted.

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. I then did the calculations again using a different span same pitch and also came up with a difference of 23 3 4. I used will holladay s a roof cutter s secrets pp. For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17.

But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons. A collar tie is a tension tie in the upper third of opposing gable rafters that is intended to resist rafter separation from the ridge beam during periods of unbalanced loads such as that caused by wind uplift or unbalanced roof loads from snow. Butt the first new truss against the old one. 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.

The 2015 international residential code does not require collar ties or collar beams. Collar tie is a colloquial term for collar beam. We began by tearing off the shingles and removing a skylight from the shed roof.