3/4 ply as a deck?

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12 years 6 months ago #21474 by Andrea
3/4 ply as a deck? was created by Andrea
Is this advisable? Deck will be entirely protected from the elements. We were given some nice plywood, so wondering if this can be used ok... can't find many references on the 'net, other than roof decks and all the weatherproofing they need...

Cheers
Andrea
Oxford

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12 years 6 months ago #311529 by Kiwi303
Replied by Kiwi303 on topic 3/4 ply as a deck?
we used painted 19mm as a side deck up north. and 17mm on the front 120SqM deck that was to get 7mm fibrebord capping that we never got around to installing. Works quite well, everything got copious amounts of silicone seal upon laying and kept the underneath storage nice and dry.

You Live and Learn, or you don't Live Long -anon

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12 years 6 months ago #311540 by TKFARMER
Replied by TKFARMER on topic 3/4 ply as a deck?
I gather it is treated and if so can`t see a problem tkf

Playing farmer on 3.5 acres. [:)][:)]

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12 years 6 months ago #311545 by max2
Replied by max2 on topic 3/4 ply as a deck?
I also think it depends on the under support as far as piers etc go. I recently looked at a house for M & D and the deck was plywood type structure, but as springy as E's trampoline.

if we had bought the place, I would have ripped the whole lot out, extended the gable end of the main bedroom and re-done the deck with composite strip flooring.

Our decking on this house (the rebuild) and the village house have both shrunk hugely since installation and SOH spent lots of effort to ensure the angles etc were cut correctly. he need not have wasted his time in hindsight. :( :( :(

Absolutely unacceptable.

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12 years 6 months ago #311546 by Andrea1
Replied by Andrea1 on topic 3/4 ply as a deck?
Great thanks! It's exterior grade, and treated, so should be fine.

Cheers
Andrea
Oxford

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12 years 6 months ago #311548 by Andrea1
Replied by Andrea1 on topic 3/4 ply as a deck?
I think the recommended ctrs for support joists of regular decking is 16"... do you think closer together would be necessary for plywood?

Thanks for that, swaggie.

Andrea
Oxford

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12 years 6 months ago #311549 by max2
Replied by max2 on topic 3/4 ply as a deck?
Andrea I know our verandah was over engineered for council approval and this is because if people have an outdoor party and they are all on the deck at once, its under more pressure to collapse.

Our inspector was in awe of what the engineers designed for the job here and that is just the way engineers here design things, because at the end of the day if the deck complies with its building regs then collapses, the approving authorities and designers are next in line for suing....

all I can suggest is to check with your local authority as to what they want from your reno. :) :) :)

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12 years 6 months ago #311574 by Kiwi303
Replied by Kiwi303 on topic 3/4 ply as a deck?

Andrea;296209 wrote: I think the recommended ctrs for support joists of regular decking is 16"... do you think closer together would be necessary for plywood?

Thanks for that, swaggie.

Andrea
Oxford

Our side deck was 4x2 bearers at 600mm spacing, with 3x2 nogs every 400mm, over 6x2 joists on piles, that was under the side decking where everyone walks to and fro and in the sliding doors there. The main deck sticking out over the bank was 4.8M or 3.6M (dependant on which span it was over) 8x2 bearers/joists at 600mm with 4x2 nogs at 600mm, over dual 6x2s making 6x4 spanning the piles. Where the side ply deck on one side and the side tread timber deck on the other met the ply deck out front, the nogs were 8x2s. All dimensions divisible by 2400 and 1200 :D

That main deck job took me all summer one year working weekends and holidays home from uni, pretty much by myself. The handrail went up in one day of all 5 of us working. (Mum, Elder sister, Me, younger brother and younger sister)

Here's three pics, one of the deck in it's bare essentials, the next competed from the lawn, and a final one down the hill at the distant deck.




You Live and Learn, or you don't Live Long -anon

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12 years 6 months ago #311578 by Andrea1
Replied by Andrea1 on topic 3/4 ply as a deck?
Nice deck, kiwi! Well done! The one we want to do from the ply isn't anywhere near as ambitious or large or that high off the ground (will only be a step up, actually), and not even in a high-traffic area. Just looking forward to sprucing this place up a bit now that we've most of the farm infrastructure done after 5 years here, chipping away as time and funds allow.

Thanks everyone for the advice! :)

Andrea
Oxford

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12 years 6 months ago #311597 by sod
Replied by sod on topic 3/4 ply as a deck?
Just talked to neighbour who has one and he said if it's uncovered he cut small saw cuts in it to get rid of water and stop it getting slippery

Having time is a measure of enthusiasm:rolleyes:

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12 years 6 months ago #311605 by Andrea1
Replied by Andrea1 on topic 3/4 ply as a deck?
Thanks, sod - this one will be completely covered, with an overhang that won't allow much rain on it, plus there's a really dense shelter belt behind (southerly side), so that side of the house is really protected when the southerlies are up.

Cheers!
Andrea
Oxford

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12 years 6 months ago #311608 by Kiwi303
Replied by Kiwi303 on topic 3/4 ply as a deck?
It's easier to just make a 1cm drop per 2.4M length to allow water runoff, and paint with a rubberised high wear ships deck paint from Burnsco or other ships chandlers. Cutting the ply can weaken it by exposing the inner laminatee. other wise a THICK coat of standard house exterior paint topped by shaking fine sieved beach sand over the wet paint will give good grip for a while, and it easy to replace as it wears under your feet.

P.S. have the under deck timber all gauged to equal thickness, roughsawn timber can be uneven, so you need to wath the levels a lot more, if all the timber is identical, you finish with a much better job and no water pooling or uneven runoff...

You Live and Learn, or you don't Live Long -anon

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12 years 6 months ago #311631 by Andrea1
Replied by Andrea1 on topic 3/4 ply as a deck?
Thanks for that. None of the sheets are going to be cut, and it's going to be waterproofed anyway, just to be on the safe side. Warped plywood is no fun. The timber's going to come from Gold Pine, and DH is planning to install it on a slight angle to encourage runoff if necessary (you never can tell with Mother Nature!). DH was wondering aloud about using a marine grade paint, so I think we will go to that extra length.

Cheers
Andrea

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12 years 6 months ago #311639 by Simkin
Replied by Simkin on topic 3/4 ply as a deck?
Nice job, Kiwi :)

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12 years 5 months ago #312723 by Hawkspur
Replied by Hawkspur on topic 3/4 ply as a deck?
There are specific paints designed for the high wear floor situation and a little sand between the last 2 coats is required if there is any likelihood of moisture underfoot especially if this is a main access to a house.
For these paints to last well make sure the surface prep is good.

19mm ply should span 400mm for light use flooring, (not heavy loads eg cars, groups of dancing people) and may span further depending on the direction of the face grain and the stress grade of the ply. For further info look at page 26-27 of this link:
www.ecoply.co.nz/UserFiles/Ecoply/File/E...l_Mar_2008_final.pdf

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