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  1. #1
    Join Date
    Jun 2010
    Location
    Newcastle
    Posts
    21

    Default Timber Deck attached to house

    Hi Guys!

    Im looking to build a deck out the back of my place, and have used all of the other threads to help me do it! There are a couple of questions that I couldnt find answers to however...

    My deck is about 7.4m x 4.8m and is only about 800mm off the ground. As the deck is so low, I was looking to attach it directly to the house foundations. The foundations are brick, on which sits my weatherboard house. My question is how to do this. Is there any difference between dynabolting into the brick, and using through-bolts? (I can get under my house to put a nut on).

    Secondly, decking screws - there are so any to choose from! Can I just use the basic 10g x 50 mm or should i go bigger? Also, has anyone had any issues with the 304 grade screws? I live about 20 mins from the coast, but my deck will be covered, and really dont want to have to pay for 316 grade screws.

    Appreciate any help you can offer!

    Thanks,
    Pete

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  3. #2
    Join Date
    May 2004
    Location
    Daylesford, Victoria
    Posts
    402

    Default

    Hi Pete,

    I built a similar-sized (and height) deck a few years back, and mainly through-bolted it to the brick foundations. I was advised that through-bolts were better as I had older bricks and the dynabolts could just (potentially) crack them and so not provide a solid hold. So I only dyna-bolted in one section where I couldn't access the back of the wall.

    I guess it also prevents the deck working loose through movemebnt or cracking in the bricks over time. I went back in after a couple of months and re-tightened the bolts but they seemed fine.

    Between the bolts and the posts concreted in every 1.8 or less metres it's rock solid.

    You can get a book on building decks and pergolas at Bunnings (some libraries have it too) which is Australian and has lots of useful info if you haven't built a deck before...it answered all my questions.

    Regards,
    Darren

  4. #3
    Join Date
    Jun 2010
    Location
    Newcastle
    Posts
    21

    Default

    Hi Darren!

    Super quick reply!

    I gather that you're talking about the Allan Staines Deck and Pergola book from bunnings? Ive got that and its fantastic!

    Its good to hear from someone that has done exactly the same as me!

    Im starting to like the idea of through bolts. They are some pretty solid reasons you gave then. I read all of the threads discouraging people from attaching their decks to their house, but from what I can gather, that is mainly to do with brick veneer.

    Appreciate the help!

    Pete

  5. #4
    Join Date
    May 2004
    Location
    Daylesford, Victoria
    Posts
    402

    Default

    That's the book. Glad I could help. It was my first 'big' project in the house and included a few learning steps (and new tools ).

    Spend time on the structure, get it all straight and rock-solid and the top should be a breeze. I used merbau and just pre-drilled and nailed it down, but should have gone for screws as some have raised up a little as the wood shrinks, but not enough to worry about.

    The lnly hint is to plan railings so that the posts can be incorporated into the support structure, much easier than attaching them later (as I did in one section).

    Good luck, and enjoy the project (and the finished deck!).

    Regards,
    Darren

  6. #5
    Join Date
    Jun 2010
    Location
    Newcastle
    Posts
    21

    Default

    Dont you love getting new tools!

    This is my first 'big' project too, and I was planning on taking my time and getting everything right. Im doing merbau aswell, with a pine frame. I have already incorporated the handrail posts into the frame, so should be all good there.

    Thanks again,
    Pete

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