I own a home with a low pitched roof with T&G. I measured the pitch and found it to be 30" in 12' pitch (2.5:12) in researching with various roofers and roofing supply centers I am told I can replace with a composite shingle as long as I double felt with
D226 15#. How do I verify this? I'm having a city inspector visit today to determine what they believe are my options.To further complicate things the home is a post & beam construction with open beam ceilings. Beams are spaced 32" on center and the roof has a 3"-4" material that looks like a particle board type material (insulation board from the 50's?) that is exposed inside (but painted). No plywood was used when the T&G roof was re-done 15 years ago so - - -

I am looking at removing the existing T&G, laying a felt layer either D4869 light or D226 on the exterior side of the original insulation board then laying 2x4 treated from eave to cap mechanically attaching these inline to the interior beams then laying a 19/32" tech shield down for insulation with cap and eave vents looking at the 1.5" airspace and original roofing material as increased insulation. Then double felting with D226 and topping it off with a 20-30 year shingle.

Am I anywhere near close on this plan? One roofer said he did one just like this not too far from here and the owner reported (according to the installer) cooler temps in the summer.

Any opinions are welcomed. Please help me do this right.
~RT

 

I don't know if I would want to remove the T&G if it's not damaged but more importantly I would like to see the house that the roofer did in the neighborhood. If the roofer won't have the owner call you, the inspector might know where it is.