And I didn’t go with a ridge beam because all of the contractors are booked a year to three years out, so I hade to go with what I could install myself.Īny guidance (and hopefully reassurances) you could provide would be much appreciated. I’m trying to figure out if it’s worth the hassle of removing some spray foam to install additional ties or if I’m just being overly. Do you think 2圆 rafter ties spaces 48” OC is sufficient in this case?Īnd before you ask, my doubts arose after we had closed cell spray foam installed, otherwise I would have just tossed up some extra ties to make the spacing 24” OC. So I thought I’d crowdsource my question to y’all. I asked the local inspector, but his response was “I believe 48” OC is correct.” That’s not a response that inspires confidence. I recently read a thread, however, which suggests that rafter ties placed 48” OC may not be sufficient. This usually happens because of leaks in the attic. If your rafters become wet and start to rot, they’ll become weak and your roof might start to sag. The rafter ties are fastened to the rafters using GRK structural screws pursuant to the ICC nailing schedule for this spacing and ground snow load. You might need to add more rafters or other types of support to make sure your roof stays strong. The rafter ties are attached to the bottom of the rafter boards, right above the top plate. We do, however, live in a wintery location that requires the roof to handle 42 psf (60 psf ground snow load).īased on garage building pamphlets from local cities and counties, and after consulting local contractors, we installed 2圆 collar ties 4” below the ridge board 48” OC. The roof is a metal roof attached to the rafters using 2x4 purlins - so it’s a relatively light-weight roof. The roof is built using 2x8 common rafters 24” OC at an 8/12 pitch. The garage is 16’ wide, 24’ long garage with 9’ walls.

I’m in the process of finishing a single story, detached garage with a gable roof that I’ve spent the summer building.

Rafter ties in roof of old home