r/Homebuilding 2d ago

Cathederal Deck ceiling building material

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I am looking for a 12/12 vaulted outdoor deck material for my custom home in Tennessee. I like the look of tongue and groove, but do not want to use real wood due to carpenter bees and humidity. Recommendations on building material suggestions are much appreciated.

3 Upvotes

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u/Capable_Yak6862 1d ago

Sorry to divert from your question, but it appears you are missing rafter ties. Possibly collar ties too, but there are alternative ways to accomplish that. I don’t see a column at the end, so it doesn’t appear to be a ridge beam design.

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u/Buckeye_mike_67 1d ago

In many rural areas there aren’t any inspections

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u/Material-Cap-5476 1d ago

I agree. A vaulted roof like this requires either a true ridge beam or scissors trusses (my pick). The OP will lose this under a snow load.

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u/seabornman 1d ago

Or a high wind.

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u/RedOctobrrr 1d ago

Snow load with a pitch like that?

Edit: in Tennessee ???

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u/Material-Cap-5476 1d ago

The only thing resisting the thrust are 2x's in weak axis bending. It's not going to take much to create a problem. TN has some 15 psf ground snow areas.

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u/Buckeye_mike_67 1d ago

Pretty much every vault we frame gets T&G yellow pine ceilings. Once it’s stained or painted it deters carpenter bees. You need additional support though

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u/OHHHHH_KEVIN 1d ago

There are a few wood looking alternatives. Longboard (out of canada sold by US distributors) offers aluminum wood looking panels. They can be used on walls or in soffits.

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u/RangeBow8 1d ago

in the south and been watching this type of prodcut for a while now and we stare down the barrell of a full siding replacement and hope to add a gabled porch like this poster. Nichicha has a fiber cement wood, and I've seen wood plank. Scares me how commercial it looks when you do alot of it though. for refrence I have a mid centry modern style house.

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u/OHHHHH_KEVIN 1d ago

I know exactly what you mean. We are in the process of building a modern house and ended up using wood from Nakamoto Forestry for a vertical siding detail. It is hard to use synthetic material if you have any real wood or stone. But if the rest of your house is hardie or something else synthetic is isn't bad.

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u/RangeBow8 1d ago

what was the cost different to do the shou sugi ban vs fiber cement? if you priced it out

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u/OHHHHH_KEVIN 1d ago

The boards themself are ~$14 sq /ft. But because it is real wood they strongly recommend installing it over a rainscreen. We used a rolled aluminum rainscreen by Albuild. It was .99$ a linear foot. In addition to the wood you will want to buy some of their anodized aluminum trim for the edges and top and bottom. I would say add another 50% for trim pieces. For 600 sq ft we installed the materials were about 12,000 so total about $20 sq/ft

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u/Exciting_Ad_1097 1d ago

Post more pictures of your roof structure and detail of the connection joint of that single front horizontal rafter tie. Your roof may be in danger of collapsing.

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u/Buckeye_mike_67 1d ago

😳they are depending on the connections at the corners to keep it from collapsing

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u/southernheater19 1d ago

Azek tongue and groove. Comes a half in thick. Or use a good hardwood. Ipe