It's been discussed that ply is a cheap shed covering (if you don't mind the look), but I've seen few guides on how to do it. I've put ply in the garden and it's peeled, so I'm pretty certain it needs treating, but with what? Also, are there any rules I need to follow in construction? I'm intending to nog the joins, should I place the sheets vertically or horizontally? Do I need to do something special where two sheets butt up against each other? Should I cap the corners in any way? Or is it just a case of plenty of treatment and hope for the best? Also, what fixings should I use? Thanks.
Is ply a cheap shed covering? Maybe, if you use very low quality ply. All plywood types need their edges sealed to prevent moisture ingress, even marine ply. Sealing the edges can simply mean painting with decent exterior paint. But you must paint those edges before the sheets are nailed up. Rules for construction? Screw or nail to your framework every 200mm. Use fixings at least 2.5x the thickness of your ply, so if 18mm ply, use 5x50mm, or 2inch ringshanks. Fit sheets vertically. You do not want a moisture trap halfway up your wall. Lap and cap the corner joints. Give it a coat of primer, and at least 2 coats of quality exterior paint. What does this mean? Nog?
It only really applies if you're putting the sheets horizontally https://community.screwfix.com/threads/noggin-for-flooring-joint-support.16366/
Have you actually worked out the cost, including paint/treatment and time applying it? Pressure treated T&G is arguably a much better option and probably a similar price overall.
The peeled ply was probably interior quality. Go for minimum 18mm WBP exterior quality at up to £60 sheet or equivalent £20 sqm. Compare with featheredge £2 m for 100mm wide x 14m per sqm £28 per sqm.
An advantage of using ply is the sheets, if properly fixed, work to prevent the structure from racking. T&G can't do this, and cutting in diagonal bracing can be daunting for a novice
1) 18mm WBP plywood £20 sqm 2) Featheredge treated £28 sqm 3) 19 mm T & G treated £40 sqm Without costing in the additional framework for 2) & 3) Roughly.
Yes, this basically. Ply I can screw without making too much of a mess (if I treat the holes). I could screw T & G, but I think most people don't, and I don't have a nail gun. Another thing is quality. If I get ply I can go to wickes, select a few sheets and make sure they're good quality. The question is, do I check for straightness of every T&G length I buy and even if I do is there any guarantee they will all slot together neatly? I don't fancy my chances, seen plenty of videos where people had trouble with warping. If I can avoid all that with ply it's a win.
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