If you really wanted some airflow between board and joist I think you'd need a more aggressive profile than the reeding that decking gets. Those piddly little cuts would let water wick into the joint easily though. If 2 timber faces together was such a problem why are the bearers commonly sistered together? I dismantled a 30 year old pine deck with smooth boards and the joists showing rot had it where the gap between the decking boards had trapped dirt. I think the reeding was a visual feature to hide surface checking (splits).
nala2,
Apr 30, 7:44am
An old time builder told me they used to lay a length of No8 wire along the joists to give clearance for outdoor work , using rimu mostly in those days.
ebygum1,
May 1, 6:08pm
It is not only for main access the standard requires it for a deck that provides access to a building, no mention of main access.
speeedy1,
May 1, 8:13pm
When constructing don't go for the maximum bearer and joist spacings. At minimum use an extra joist or two; use the 4cm decking with grooves face down; a decent gap between decking to allow debri to be swept clear ( we used a bunch of aluminium angles cut from a length. When putting down the decking, mark off datum marks at reguIar intervals to reference and avoid accumulated error (creep) . 2 or 3 or more times during the year, I hit the deck with the compressor and blow any crap that has accumulated in the gaps and on the joist surface. Muck and moisture will kill your deck. Stain regularly.
sanders4,
May 2, 9:45pm
silly joke it seems as I have grooved 32mm pine that is as good now as it was laid 22 years ago around a small pool - waterblasted every 2 years and sprayed with wet and forget each alternative year
sanders4,
May 2, 9:47pm
stupid as anti slip is important in some areas and my own decking is 32mm pine with grooves up and it is still perfect after 22 years use
kiwimade64,
Nov 16, 8:42am
I would have storage under the seat for cushions and so on.
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