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New Construction roofing question  

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Matt T
Posts: 261
(@Matt_T)
Advanced Member
Joined: 13 years ago

Greetings everyone!

I am in the process of building my own house. The walls are poured concrete. The roof will be a hip style which will have no overhang and be finished with a standing seam metal roof.

My question is related to sheathing over the rafters for the roof. I was planning on using T1-11 with the grooves facing down which is pretty typical here. I was going to paint all the rafters and sheathing before installation and would use a light color like an off white or sand or something similar.

Someone recently offered me some cedar tounge and groove planking at a really good price. Its already been on island for about 10 years and has been stored properly. Looks like very nice stuff.

For people who have T1-11 or planking for their roof, do you have any feedback on how its worked out for you? I could put the cedar to use for other things, don't necessarily have to use it for the roof but seems like it could add a nice aesthetic compared to the T1-11.

I know cypress is what's usually used and I would prefer the lighter look of whitewashed cypress but perhaps I could do something to lighten the cedar? On the other hand, I could keep it the natural color and just stain it clear and then use a cedar toned stain for the rafters. This would give a nice natural look that seems would be more maintenance free than something with a lighter color in regards to dust, mildew, etc.

Thanks for any input you can give me.

11 Replies
singlefin
Posts: 852
(@singlefin)
Trusted Member
Joined: 5 years ago

I belive cypress is the wood of choice because it's naturally insect resistant. They used cypress T&G on my ceiling, over heavy 3" wide pressure treated rafters 24" apart. The contractor bolted custom steel brackets into the peak. We stained it a dark brown and I think it's probably the most impressive feature of the home.
I wouldn't have any concerns riding out a hurricane in it. No mold or bug issues since it was built 5 years ago.

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Exit Zero
Posts: 2289
Registered
(@exit-zero)
Trusted Member
Joined: 11 years ago

are you planning to have anything between the wood roof and the standing seam metal ?

Battens, insulation, sprayed foam for instance.

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Scubadoo
Posts: 2234
(@Scubadoo)
Trusted Member
Joined: 5 years ago

I've been looking at this site lately to compare wood properties. Apparently there are many varieties of cedar, which do you have? Some cedar is in the cypress family. Putting the rough side of T1-11 on the inside might make it a real pain to keep clean if you get any cob webs, bug dirt, a little mold on it. Paint may not smooth it out all that much. The cedar T&G is probably smoother?

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Matt T
Posts: 261
(@Matt_T)
Advanced Member
Joined: 13 years ago

Thanks for the replies so far.

Singlefin, yes cypress seems the go to here and if I was buying would go that route. But the cedar I am being offered is very good quality and price is right. I have also read that the cypress available these days is softwood and much more susceptible to rot and insects.

Exit Zero, I will have 1 x 4 or 2 x 4 purlins that the metal roof will attach to. I think I will definitely go with a radiant barrier but my research so far has shown that insulation does not make a noticeable difference on the roof, in particularly on houses that use natural ventilation for cooling. I am also aware that the air gap between the planking and the metal roof should provide a thermal break and help prevent radiant heat from getting through to the interior.

Scubadoo, thanks for the link. I am not sure of the type of cedar. I am hoping I can get more info on that. I do know that its about 10 or 12 years old and has been stored in a dry dark area. That means it has well adjusted to the climate here and I'm thinking the cedar that was available 10 years ago is probably better quality than what is being offered today.

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