Posted By mlawrence17 on 25 May 2016 09:53 AM
I builit a sip home in Charleston SC about 9 years ago. None of the interior joints were taped and a vapor barrier was installed over the whole roof. Needless to say I've got some rot issues. The panels are 4' wide 8 1/4" eps with (2) 2x8 splines. The panels rest on a ridge beam and the top wall plate. The spans very, but most are about 11' 7". After talking with the panel Mfg., it's my understanding that the splines are NOT structural due to our location and spanning distance. The outer layer of OSB is pretty bad about 1' down or so, and maybe 4' down each spline. The interior OSB is perfectly fine. I've got to take some pictures and send to the panel mfg but I wanted to get some input from you folks. Any info is appreciated.
Did your manufacturer ever respond with anything positive?