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Deck Design Criticism. Point out my mistakes!

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  1. #1
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    Default Deck Design Criticism. Point out my mistakes!

    It's time to design the deck for the back of my house. My little bungalow deck came out nicely so my confidence has grown, but criticism can't hurt before I go off to try and get a permit for it.

    Consulted several span tables and came up with the below.

    Wind Classification: N1 (I know this from when my bungalow was built)
    5000 wide x 2000 deep

    Deck
    Bearers: 2/190 x 45 inner and outer
    Outer Bearers will be M10 bolted to outside, notched 30mm in. Would this be better with one on each side, notched 10mm in per side?
    Joists: 140 x 35; 416 centers
    Posts: 100 x 100 Cypress; 100mm in from front, back and sides
    Inner: 4 posts due to a gully trap right in the middle; 1879 centers for two middle ones, lower for the other two sides
    Outer: 3 posts; 2375 centers
    Will be concrete footings with galvanized anchors embedded. 400 deep x 300 wide

    Roof
    Beam: 190 x 45
    Ledger: 90 x 45; will be coach bolted (?) to house which is timber
    Rafters: 90 x 45; 555 centers
    Highest post is 3403

    Front:



    Side:



    Any and all criticism welcome! What have I stuffed up? What could be better,? Is it all good?

    Thanks!
    Attached Thumbnails Attached Thumbnails house-deck.png   house-deck-1-.png  

  2. #2
    Seasoned DIY droog's Avatar
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    Default

    Haven’t looked at other details but first comment, up the joists to 45mm.

  3. #3
    Community Moderator phild01's Avatar
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    Would you consider going at least 3m rather than 2, especially when you have guests over.

  4. #4
    Slow but rough Uncle Bob's Avatar
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    Quote Originally Posted by phild01 View Post
    Would you consider going at least 3m rather than 2, especially when you have guests over.
    Yep, Decks are like cowbells, you can't have too much of them, well maybe when it comes to upkeep

  5. #5
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    Quote Originally Posted by droog View Post
    Haven’t looked at other details but first comment, up the joists to 45mm.
    Nice, will do, thanks!

    Quote Originally Posted by phild01 View Post
    Would you consider going at least 3m rather than 2, especially when you have guests over.
    Nah, we're going to flip this house. I didn't want to go too big, but not too small either. It's more to just pretty it up a bit and have somewhere to sit. The area is a hard sell, so I need some emotional hooks on the place to help things along. Diamond in the rough type thing. Thanks for the input though!

  6. #6
    Old Chippy 6K
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    Use Blocklayer's site https://www.blocklayer.com
    Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.

  7. #7
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    Quote Originally Posted by Bloss View Post
    Use Blocklayer's site https://www.blocklayer.com
    Thanks, I did use the deck calculator in there. I did not know about all the other stuff though, that's amazing!

    Something else I wanted to ask in my original post was thoughts on guttering for this deck? You can see the ground fall in the pics, so am wondering if it would be needed? I guess that would come down to the permit granters, though

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