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airscape
Jan 24, 2011, 8:00 AM
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I want to build an outdoor woody. It will be a pillar bolted down on a concrete slab, and will probably have a roof of corrugated sheeting. The roof will probably not supply cover to the bottom half of it so there will be sun and rain exposure.
How would I go about waterproofing it, and protecting it from the sun? It seems that holds last quite a while outside though.
I have to obviously seal the sides and edges of the plywood, but what should I use?
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xbrianx1990
Jan 24, 2011, 2:34 PM
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Weatherproofing an outdoor wooden structure? I'd try paint and caulk....Sounds kinkda like a house or shed construction question. I'm no carpenter but I would bet the guys at home depot would be able to help you out.
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airscape
Jan 24, 2011, 2:50 PM
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What is home depot? 
I'm building the structure with steel, WHich I will have galvanized.
It's just the ply that's worrieng me.
Is there anything else one could use that isn't plywood?
Maybe I should use steel plate?
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wrbill
Jan 24, 2011, 2:51 PM
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xbrianx1990 wrote: I would bet the guys at home depot would be able to help you out.
Not trying to be an "ASS" but if you look you will see the OP is in Africa.
But you are right about paint and caulking being the way to seal the wood. To help out a little I would leave the plywood about six to 12 inches off the ground then but a small strip of plywood below that. The reason for the small strip at the bottom is that when it gets damaged it is easy to replace.
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wrbill
Jan 24, 2011, 3:13 PM
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Plywood is the way to go, as it is strong and easy to cut. Using a steel structure is good, most good gyms build that way.
The plywood will work just fine, the key is to use a good sealer and put on more than one coat. Paint will work but make sure you use a primer then two or three coats of paint.
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xbrianx1990
Jan 24, 2011, 4:02 PM
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haha, yeah I am an ass.
Didnt see the africa part.....
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airscape
Jan 24, 2011, 4:07 PM
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wrbill wrote: Plywood is the way to go, as it is strong and easy to cut. Using a steel structure is good, most good gyms build that way. The plywood will work just fine, the key is to use a good sealer and put on more than one coat. Paint will work but make sure you use a primer then two or three coats of paint.
I have everything I need to make anything out of steel. I'm going to way up the cost of using steel plate vs ply.
If I go with ply, how do Seal the edges? I'm thinking to use wood filler (Like those 10kg buckets) and then sand it down before painting?
PVA paint?
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wrbill
Jan 24, 2011, 4:28 PM
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I would not use steel plate because I think you will have a problem with getting frication with your shoes. As for sealing the edges there are two ways that I would do this.
1. Is to use the sealer, it will soke in more on the edges so you will want to put three or four coats.
2. The other is to use auto body putty on the edges. The good thing with the auto body putty is that you can also use on the seams where two sheets of plywood meet. Plus the body putty is sandable. I helped build and you used about 16 gallons of the it. Works great for smoothing out areas and filling small gaps and holes.
Hope this help some more.
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airscape
Jan 24, 2011, 4:48 PM
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Thanks!
I like the auto body filler idea.
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cornstateclimber
Jan 24, 2011, 5:30 PM
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you should be able to get pressure treated plywood, which would not require any sealing at all, but a good coat of paint is the way to go, it will last longer. and as with the paint, if you are wanting some friction on youre wall, i would suggest putting some sand in your paint and mixing it well. i done this with my wall and it worked out great. the treated plywood is holding up well. its been up for ten years now, no roof or cover of any kind,. the only problem i have had is the bnolts and t-nuts. they hqave decided to rust over all the years of great illinois weather. so trying to find a stainless steel t nut and bolts would be well worth youre time and the money, if you plan on moving the holds. good luck, and i hope this was helpfull
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banketh
Jan 24, 2011, 5:59 PM
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You can seal the plywood very nicely with wood-glue. Mix in about 2/3rds glue 1/3 water and mix it down, then paint the entire surface with it. Seals the entire board, adds stability if you paint it once it's assembled, and it gives a better surface for the paint/primer to adhere too. If you can't get enough glue to paint the whole thing, just painting the edges with glue will definitely help
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airscape
Jan 24, 2011, 6:05 PM
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Thanks for the suggestions.
Stainless t nuts might be a bitch to find, If I can't find stainless I'll use plated t nuts and plated bolts.
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kachoong
Jan 24, 2011, 6:11 PM
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Is it that rainy where you live? I thought about making a roof and waterproofing the wall I'm building but then realized that 22-24" rain a year probably wasn't worth the effort. I'm thinkin' more about termites though.
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airscape
Jan 24, 2011, 6:20 PM
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Nah, it's not too rainy.
But things turn to shit pretty quickly if they are outside.
I the sun is probably going to do more harm than the rain.
That's why i'm considering steel also.
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tower_climber
Jan 25, 2011, 8:13 PM
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I use a product called Total Wood Protectant. It prevents UV damage, mold, mildew and water damage.
You probably want the TWP100.
http://www.woodsealants.com/
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gmggg
Jan 25, 2011, 8:53 PM
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airscape wrote: I want to build an outdoor woody. It will be a pillar bolted down on a concrete slab, and will probably have a roof of corrugated sheeting. The roof will probably not supply cover to the bottom half of it so there will be sun and rain exposure. How would I go about waterproofing it, and protecting it from the sun? It seems that holds last quite a while outside though. I have to obviously seal the sides and edges of the plywood, but what should I use?
You're worried for naught. Just make sure that you get a marine or exterior grade plywood and you coat it with an appropriate exterior paint. And it's a good idea to re-coat every year or two depending on your wall's level of exposure.
Not sure if it's available in SA but I use MDO plywood quite a bit and have seen it last in exterior situations for 15+ years.
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dynosore
Jan 25, 2011, 9:00 PM
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What you need is a product called cwf-uv. Major chain stores here in the states have it, and you may be able to find it where you're at. It's hands down the best for an outdoor woody. It dries clear, has good friction properties for smearing, and makes wood last longer outdoors than anything I've ever used, including exterior paint. My untreated plywood woodie has lasted over 6 years of hot, cold, and rain with this sealer and has a lot of life left. Highly recommend.
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airscape
Jan 25, 2011, 9:04 PM
Post #18 of 18
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I'll have a look around for it or something similar.
Also the MDO ply
I'm almost done with the frame design, I shall post it if I am
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