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 Building a 40' geodesic dome out of wood
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Rob Tucker
Kama'aina

9756 Posts

Posted - 12/14/2018 :  08:59:26  Show Profile  Reply with Quote
Just for curiosity how do you intend to make this dome water tight?
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/14/2018 :  09:35:48  Show Profile  Reply with Quote
Silicone sealant across all the external plywood joints, then a polyurethane coat over everything. Later I might cover the whole thing in asphalt roof shingles, but this is step one.
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/14/2018 :  09:40:42  Show Profile  Reply with Quote
There's also the old playa-tested method of sealing all the edges with marine boating fiberglass tape, aka 'yurt tape'.
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/14/2018 :  10:32:05  Show Profile  Reply with Quote
Actually, on further reflection I think 'yurt tape' followed by an epoxy coat would do the trick much faster and more thoroughly than anything else, and it looks like that's doable for about $1200.
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Rob Tucker
Kama'aina

9756 Posts

Posted - 12/14/2018 :  11:05:28  Show Profile  Reply with Quote
Good luck.
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/14/2018 :  11:23:04  Show Profile  Reply with Quote
Thanks! In my experience dome weatherproofing only really fails when people try to build them like they were a regular box-house.

Overlapping fiberglass tape sheaths seal up all the panel joins, and then epoxy (or more accurately, polycuramine) seals over the whole surface - also incidentally sealing the tape rather permanently to the panels.
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Rob Tucker
Kama'aina

9756 Posts

Posted - 12/14/2018 :  11:57:15  Show Profile  Reply with Quote
You have done this before?
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/14/2018 :  12:45:29  Show Profile  Reply with Quote
With smaller domes, yeah. Largest was 25 feet.
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MarkP
Punatic

2225 Posts

Posted - 12/14/2018 :  13:41:50  Show Profile  Reply with Quote
You can make waterproof seams in EPDM, right? It would be a very finicky job but if you put in enough effort It seems like you should be able to make a watertight EPDM roof of almost any configuration.
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/14/2018 :  20:35:21  Show Profile  Reply with Quote
Heh. Yeah, although having worked with EPDM when I made my koi pond back in Berkeley, I gotta say 'no thank you'.
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/15/2018 :  11:25:46  Show Profile  Reply with Quote
Huh. Talked to HPM today; their quote for lumber, plus delivery, was only $500 more than Home Depot's.

Mahalo nui for the recommendation! It looks like I found a winner.
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Lolo
Da Kine

114 Posts

Posted - 12/15/2018 :  13:46:00  Show Profile  Reply with Quote

I bought all my materials for a 10 X 12 shed from them, including metal roofing and they invited me to watch the metal being formed. Pretty cool. They also have a great power tool sale, pretty nice raffles and community activities. And no, I just have had good experience with them and as far as I know they are locally owned.
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/15/2018 :  14:04:28  Show Profile  Reply with Quote
Yeah, all of that is a big win for me. I was expecting to hold my nose and give my money to the big chain, but HPM seems amazing.

Maybe after I've built, I'll go apply for a job there in Keaau to keep busy. :)
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ProjectDomecile
Newbie

USA
40 Posts

Posted - 12/16/2018 :  09:21:51  Show Profile  Reply with Quote
Huh. I just got a substantial windfall, so it looks like I can afford to build in Seaview instead of Kalapana. This should be... interesting.

If the neighbors can handle a giant castle, surely they'll be chill with a moderately-sized dome?
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Rob Tucker
Kama'aina

9756 Posts

Posted - 12/16/2018 :  16:29:06  Show Profile  Reply with Quote
I don't know this for a fact but it was my understanding that Home Depot gets it's lumber supplies from HPM and/or Honsador.
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