Attach 1 story gable roof to 2 story house

7874 Views 2 Replies 3 Participants Last post by carpdad, May 29, 2016

jvallee

Discussion Starter · May 25, 2016

I have searched the forum and found a similar post but not an answer.
I am planning a 16x16 1 story screened porch and it will be attached to my 2 story vinyl sided house.
I am using a gable roof where rafters run parallel to house with a ridge board.
I will be using either collar ties or joists (can't decide which one) but I know I'll need one or the other.
I've seen an option where the end rafters at the house end were fastened together and the ridge board was hung from them with a joist hanger and an option where the last rafters are attached to the ridge board like all others.
No sure which option to go with.

Also how should the rafters (and ridge board) be attached to the house?

See less See more

Save

1 - 3 of 3 Posts

Gary in WA

· #2 · May 28, 2016

Either or, just remove the house siding to install rafters first. Collar ties (in upper 1/3 of roof height) are useless, you will need rafter ties (in lower 1/3 of height to keep walls from spreading out) or a structural ridge beam, get a permit, if required, just for the liability and framing inspection.

Gary

Save

carpdad

· #3 · May 29, 2016

Your ridge board is not load bearing, nor should you need one. For 8' ceiling span, all you need is 2x6 rafter and collar tie (helps with mid point sag). If 2x8 and ceiling joists alone should be fine. Check the rafter span chart. I'm in NJ and moderate snow load. My rafters were 3.5:12 and about 13'x2x6.
House side rafter can be nailed to the wall studs.
Flashing the roof to the existing wall is little more involved than ending with the step flashing under the shingles. Finehomebuilding has photo of how which involves (from memory) triple or more flashing. Esp with a vinyl siding. There is even last step flashing that looks like a funnel that kicks the water away from this point.

Save

1 - 3 of 3 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Attach 1 story gable roof to 2 story house

jvallee

Attachments

Gary in WA

carpdad

Top Contributors this Month