How to attach bearers to concrete?

kristian1982

I have started planning out my deck build in my backyard.

Looking for advice if it safe to fix bearers sitting on a post on one side then directly fixed to slab on the other using 145x45? Looks like there is a 145 joist bracket I can use to fix or is there another preferred method when attaching bearers to concrete,

I have attached a rough plan

RED- posts are 1.5 apart 100x100 h7 Cyprus

GREEN - bearers 145x45 post to slab

BLUE - Joists 45x90. 450 centre to centre

YELLOW floor board

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Comments

MitchellMc

Welcome to the Bunnings Workshop community @kristian1982. It's terrific to have you join us, and many thanks for your question about constructing a deck.

Yes, you could attach a ledger plate to the slab. You would install flashing and then bolt the ledger directly to the slab with Dynabolts.

Your plan looks quite good, but remember you'll need posts supporting the middle two bearers as well.

You might like to check out this helpful guide: How to build a deck boardwalk.

Please let me know if you have any questions.

Mitchell

kristian1982

https://www.workshop.bunnings.com.au/discussion/comment/43253#Comment_43253

Thanks Mitchell for the feedback.

I will check out the link.

So a ledger right along the slab to support the bearers from the post side is better?

does it have to be spanning the length of the boardwalk or just dynabolt pieces to support each bearer?

So you advise more posts for the middle 2 bearers? The length of the bearer is 1.5. That span from post to ledger shouldn’t need another post should it? I could Throw in a tough block it’s low enough.

Can you tell me more about the flashing? Is this just a tape onto and behind the ledger? What tape do you recommend?

posts in today image updated

MitchellMc

It's an option, which is likely more convenient than have to install another set of posts along the wall @kristian1982. Typically it is done with a single board, but I suppose you could to it with individual sections.

Sorry, my mistake. The bearers spanning the 1500mm are fine.

For the flashing, use something like CAgroup 300mm x 30m x 500um Plascourse. It goes behind the ledger to stop water transferring from the deck through to the slab. It's essential when connecting a ledger to brickwork and just a bit of a safety precaution when connecting to a slab.

Mitchell

kristian1982

https://www.workshop.bunnings.com.au/discussion/comment/43265#Comment_43265

Thanks Mitchell

much appreciated!

kristian1982

https://www.workshop.bunnings.com.au/discussion/comment/83749#Comment_83749

Much development has progress since I last posted!

im now looking at underlay options to stop any weeds etc growing through.

can anyone share what might be some good options?

JacobZ

https://www.workshop.bunnings.com.au/discussion/comment/111581#Comment_111581

Hi @kristian1982,

Nice work so far, your deck frame is coming along nicely. Thanks for the update.

I'd suggest laying down either weed mat or geotextile membrane, fixing it in place with Weed Mat Pins, then adding a thin layer of drainage gravel over the top.

The combination of matting and drainage gravel will do a great job of suppressing the weeds while still allowing water to drain through into the soil beneath.

Let me know what you think and if you have further questions, please don't hesitate to ask.

Jacob

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