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Low profile deck

beemerx65
Budding Contributor

Re: Low profile deck

Hi All. 
im currently looking at building a deck over existing paving & luckily came across this thread. I did think about using the good time pre made panels but unfortunately the height is to high as my FFL is 90mm for doorway. I was thinking of using 70mm treated. Would this also be ok ?  
thanks in advance 😁👍

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StevieB
Projects Editor
Projects Editor

Re: Low profile deck

Welcome @beemerx65. It's great to hear that you've found this discussion helpful.

 

Let me tag @Stuardo@Adam_W and @MitchellMc for their advice. @MitchellMc will be happy to help with any questions about your project when he's back on the site on Friday.

 

We'd love to follow along with your project so please feel free to start a new discussion when you begin so you can share images and details about your progress along the way.

 

Stevie

 

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Adam_W
Valued Contributor

Re: Low profile deck

Hi @beemerx65 you can use 70mm it just means that your supports will need to be closer together to avoid flex and sagging.

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beemerx65
Budding Contributor

Re: Low profile deck

B31A4945-A743-42D8-82EC-EC45E79ACF07.jpeg

BFEE5647-791C-4594-95D4-B8D3175C3438.jpeg

24EBDAF1-44B0-46FD-9AAD-C275B26A2B3C.jpeg

 

@Adam_W 

Thanks Adam. What spacing would you recommend? What do you think I should do about drainage? 
ive attached a couple of pics

tia

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MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: Low profile deck

Hi @beemerx65,

 

Let me mention @Adam_W, so he is alerted to your question.

 

So that you know, 90mm total working height minus the 19mm decking board is 71mm. Your joists will be basically sitting on the ground. This won't allow airflow or drainage, and you should expect the deck's lifespan to be limited to some degree. What you might like to do is use 90 x 45mm and lay it on it's side so it is only 45mm thick. This would at least allow 26mm underneath, which is still considered an exceptionally minimal gap.

 

Our members commonly support 90 x 45mm Pine at 1000mm, so for 70 x 45mm, you'd likely drop that to around 800mm. You can check timber span tables available online if you'd like to get a specific max span.

 

What sort of drainage issues do you experience at the moment? Does water pool on the pavers or drain away quickly?

 

Mitchell

 

 

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beemerx65
Budding Contributor

Re: Low profile deck

Hi Mitch. Thanks for the reply and an alternative suggestion to having the joists upright. The reason I mentioned drainage is that I have soakwell grates also my downpipes. Would you suggest using spacers for the gap or screwing off cuts to the beams to level & raise. 
cheers 

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MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: Low profile deck

Hi @beemerx65,

 

I'm not sure if I quite follow correctly. When you mention using spacers for the gaps, what gaps are you referencing, and what is the relevance of the downpipes? The beams will be self-supporting over their length and will travel across the soakwell grates. I'm unsure where a spacer or offcut would be screwed to level or raise the beams.

 

Looking forward to more information.

 

Mitchell

 

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beemerx65
Budding Contributor

Re: Low profile deck

beemerx65_0-1633740527653.jpeg

Hi Mitchell

im referring to like this or using shims as I been told I will not have any drainage or airflow as I was going to lay directly onto pavers. 🙏

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MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: Low profile deck

@beemerx65,

 

Thanks for clarifying. Yes, you do need to space the timber and you can use plastic shims. The timber will be on the ground so you'd need to use H4 treated as H3 is not suitable for that. Alternatively, you can use Builders Edge 25-40mm Pedestal Foot Minifeet to place your timber on top of. Their min-height is 25mm which would be perfect for the 26mm gap I specified above.

 

Mitchell

 

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beemerx65
Budding Contributor

Re: Low profile deck

Just looked on the Bunnings website. They don’t mention that size (90x 45) in h4. Do you know where I can source it ? 🙏

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