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Low-level deck

EricL
Bunnings Team Member
Bunnings Team Member

Re: Low level deck

Hi @jinugu

 

It is important to level the area first if you're planning on using the DEKO 250 x 150 x 150mm Instant Concrete Foundation Block.

 

I recommend using joist hangers as it provides better overall support for the joist. When choosing your timber, please remember that it has to be rated for framing/outdoor use. A rating of H3.2 is sufficient for your needs.

 

If we measure the DEKO foundation block you'll see that it is 150mm tall. But when the timber sits inside the gap the actual height is only 110mm. So if we add the actual height of the DEKO and the 90x45 you will get an overall height of 200mm. But the actual gap from the bottom of the timber to the soil is only 110mm. If you are using standard 90 x 19mm L/M Decking Merbau SpecRite Pre Oiled KD Select the overall height of your deck will be 219mm. Anything you add under the DEKO Foundation Block will make the deck go higher.

 

Here is the link to the DEKO block: Deko Instant Foundation Block      

 

If you need further assistance, please let us know.

 

Eric

 

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jinugu
Junior Contributor

Re: Low level deck

Hi Eric

 

Thanks for the reply. I don't intend to use Deko, i had rather stick to the posts (and digging) which i am a bit familiar with. Levelling the area itself would be a bigger task for me. Thanks for the info on rating of timber. With the design that Mitchell has proposed, there is no place for me to put the joist hangers (assuming that I will have to screw/nail the posts to the joists ) . That's what it appears to me. Would you be able to give me an idea of how I could use joist under these circumstances?

 

jinugu_0-1642068796395.png

 

 

Regards

 

Ravi Jinugu

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EricL
Bunnings Team Member
Bunnings Team Member

Re: Low level deck

Hi @jinugu

 

I've placed a picture of a joist hanger below and how it is attached to the frame.

 

If you need further assistance, please let me know.

 

Eric

 

 

 

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jinugu
Junior Contributor

Re: Low level deck

Hi Eric Sorry for the barrage of questions. Pls have a look at the the image I had attached. With the joists screwed to posts, where and how do i put the joist hangers. Thanks

 

jinugu_0-1642070560409.png

 

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EricL
Bunnings Team Member
Bunnings Team Member

Re: Low level deck

Hi @jinugu

 

Your right, there is no space for the joist hangers. From my understanding the footing can be moved back a bit so that you will have space for the joist hangers. Let me just double check this with @MitchellMc when he comes back. As soon as I have more information, I'll get back to you. 

 

Eric

 

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MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: Low level deck

@jinugu,

 

As @EricL mentioned, you can set the post back slightly from the frame to allow the installation of joist hangers.

 

Mitchell

 

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jinugu
Junior Contributor

Re: Low level deck

Thanks Mitchell. Appreciate your help. I am sure I will have more questions. Thanks once again. 

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jinugu
Junior Contributor

Re: Low level deck

Hi Mitchel/Eric

I must say you guys are very patient. One more question. When you say 'back slightly from the frame", would it be

1.  where the green square is shown i.e a little bit to the right of the joist hanger and so will still support the frame? or partly on top of the joist hanger?

2. or is it where the purple arrow is shown in the image below ( i am sure it won't be this option since in this case the post will not be supporting the frame at all)

 

A small pic will really help me. many thanks for your help.

 

 

jinugu_0-1642153113729.png

 

p.s in any case the joists will be supported by the posts in the middle (i.e other than the ones attached to the frame) as shown in the image below

 

jinugu_1-1642153886159.png

 

 

 

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EricL
Bunnings Team Member
Bunnings Team Member

Re: Low level deck

Hi @jinugu

 

It is on the purple arrow and not on the green square. Support must be given to the joist as it carries all the weight. Depending on the type of post you are using, the example I've drawn up is with a 90 x 90 post. Have a look at the sketch and if you have any other questions, don't hesitate to post them.

 

If you need further assistance, please let us know.  

 

Eric

 

 

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jinugu
Junior Contributor

Re: Low level deck

Thanks Eric. From the image I can see that the post is cut to let the joist sit on it. Will it work if I just attach them together without the cut - still nailed to the joust though. 

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