Hi everyone. First we all need to say some prayers for the souls in the trade center. How tragic.

I think I had a revelation last night and want to see if I am correct. I have been struggling with how to calculate the ridge height of a gable roof prior to installing rafters. I know everyone says just raise the ridge up with the rafters layed atop the ridge until the rafters slip into place, but my "inquiring" mind wants to know how to set a ridge that is in two sections/high up above the ceiling.

Is it correct that to figure out the actual top of ridge height you figure out the "mathematical height" and then add the HAP to this dimension? Such as, a 10/12 roof pitch has a HAP of about 4 7/8". A 30' wide building at 10/12 would have a mathematical height of 150", but with HAP at 4 7/8" wouldn't that make the ridge height be 154 7/8"?? Is THAT right? Therefore if I was using a 2x8 rdige, then I would set the bottom of that ridge 7 1/4" below 154 7/8"?

Thanks for all your help!

I think I had a revelation last night and want to see if I am correct. I have been struggling with how to calculate the ridge height of a gable roof prior to installing rafters. I know everyone says just raise the ridge up with the rafters layed atop the ridge until the rafters slip into place, but my "inquiring" mind wants to know how to set a ridge that is in two sections/high up above the ceiling.

Is it correct that to figure out the actual top of ridge height you figure out the "mathematical height" and then add the HAP to this dimension? Such as, a 10/12 roof pitch has a HAP of about 4 7/8". A 30' wide building at 10/12 would have a mathematical height of 150", but with HAP at 4 7/8" wouldn't that make the ridge height be 154 7/8"?? Is THAT right? Therefore if I was using a 2x8 rdige, then I would set the bottom of that ridge 7 1/4" below 154 7/8"?

Thanks for all your help!

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