View Full Version : bigger joists than bearers
28th Jun 2012, 04:26 PM
just a quick question ....
Is there anything wrong with using 140 x 45 mm joists on 2/ 90x45 bearers... or is just not the done thing ??
28th Jun 2012, 04:31 PM
Yep..........its upside down :hahaha:
Sorry, I'm having some time off.............prolly before they take me away.
Someone will be along with a sensible answer soon.
28th Jun 2012, 06:01 PM
Nothing wrong and based on a 5x5m deck your looking at +-$50 if you were to use 2/140 bearers. But for easy, I would go 140 bearer and 90 joist.
28th Jun 2012, 06:40 PM
the reason i want to go 140 joists on 2/90 bearers is to try and fix up and extend an old deck.
the current deck has solid posts and 90mm bearers which i wanted to avoid moving (for both cost and effort) . It also has 90mm joists but in two spots the 90mm joists span 1500mm and feels a bit springy with two people on it.
so i was going to extend off the 90mm bearers. and replace the joists with 140's to try remove the spring. Also the deck butts up to doors and is about a 65mm step and the 140mm joists will make this step down to 15mm which looks a lot neater.
so using 140mm joists on 90mm bearers should be fine for this ??
28th Jun 2012, 08:19 PM
I did the same thing at my place for the reasons you outline above, with no probs. As long as your bearers are supported with correct stump spacing it'll be fine. Over engineering is the DIY way anyway. :B
29th Jun 2012, 06:17 PM
:whs: so long as you are at or exceed the minimum specs for the spans you can do what you want - it's your money! And there are often good reasons for doing so, but no more than you need to because it is your money and why waste it!
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