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KinAlberta
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# Posted: 30 Sep 2016 14:29 - Edited by: KinAlberta
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Several of our buildings are just painted plywood. They've lasted for decades like that but we've had to paint the plywood every 20 years or so and besides the cost, its a fair bit of work to end up with a crappy looking exterior of painted plywood.
So, I might put some sort of cheap or free siding on the less visible buildings (like used fence boards or something I can get surplus), but I imagine gaps would exist so I'm wondering what would be a good underlay that would last while shedding water and may be slightly exposed between some boards, knot holes, etc..
I'd like to just use a roll of black plastic sheeting but I've seen that crumble after only a couple years where ever it was exposed to sun or weather.
Would black landscape fabric last very long? (I've seen exposed piece off it in my last for years.)
Tar paper?
Roll roofing?
Roofing membrane (the grit covered kind)
Just rely on the painted plywood underneath?
Other options???
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Just
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# Posted: 30 Sep 2016 14:41
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For the price and use i'd go with tar paper.
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KinAlberta
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# Posted: 30 Sep 2016 15:14
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Will it last long? (It would be stapled in place and mostly covered with boards but say 2' x 1/2" vertical strips might be exposed.
Also, Ive seen surplus perforated metal panels cheap. Thousand of 1/4" or smaller holes for the sun to shine through and the rain to run down.
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Just
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# Posted: 30 Sep 2016 16:21
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1/2 in gaps are ok but i would not want more .my home is covered in it (built early 70ties) has ceder siding over it but thhere ar a few cracks, seems to be ok there were I can see it
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bldginsp
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# Posted: 30 Sep 2016 20:11
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You need a positive water proof layer under the siding, otherwise, if water gets onto the plywood it will eventually start to rot. You could say that the plywood is actually better off without the siding just because the siding traps any water that gets under it, thus you need a positive waterproof layer. I suppose the paint already on the wood provides this layer, but still with siding on it I'd want a wrap to keep any trapped water off it. Paint is made to repel water where it is exposed to air, so it can dry out quickly after the rain.
The only things on your list that won't suffer quickly from sun, and will keep out water, are the roofing materials. The reason they do board and bat is so the bats cover the gaps. The main role of wood siding is to keep the sun off house wrap so it doesn't fall apart and stop working. I'd use tar paper and lap the siding or do board and bat. Cut out or cover the worst knot holes and gaps in the funky siding to protect the tar paper.
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