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Attaching ledger board to timber studs

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  1. #1
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    Default Attaching ledger board to timber studs

    Hello all,

    I am building a deck adjacent to a brick veneer. According to the plans a ledger needs to be affixed to the timber structure of the house to support the pergola. I thought the ledger should be bolted to the studs with M12 coach screws, but I read somewhere that coach screws could cause the studs to split.
    Now I am not so sure if I should use coach screws, but I don't know what else could be used. A through bolt is not an option. I won't be happy with a bolt sticking through the plaster in the room inside the house.


    What is the correct way of attaching the ledger board to the studs?

    Many thanks.

  2. #2
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    Can't you just use cup head bolts? Recess them so they are flush in the stud then patch the plaster over them.

    Why is your pegola that low? wouldn't it be above your ceiling?

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    The pergola ends up just under the eaves. If I was to use cup bolts as suggested they would end up high on the wall and I was trying to avoid repairing the plaster.

  4. #4
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    Can the plans be changed to a fly over roof? This gives more head height, good ventilation for summer. Attaches through the roof to rafters and top plate. bolts through rafters and coach screws through top plate. Google - Extenda brackets.

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    "A big boy did it and ran away"

    Legal disclaimer denying responsibility to be inserted here.

  6. #6
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    Thanks for the suggestion. I like the idea. I'll see if changing the plans is an option.

    However, this doesn't help with another structure, a carport. I am building a carport after the deck and its ledger also attaches to the studs. Unfortunately changing the plans is not an option. The council won't allow the carport roof to be higher than the house roof.

    According to Allan Staines and his book, 1/75xNo.14 type 17 batten screw should be used. I am not even sure what kind of screw this is, but it doesn't look much different from the coach screw solution. I am not sure if I a concerned for no reason or there is another, a better method.

  7. #7
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    Quote Originally Posted by ptt102 View Post
    According to Allan Staines and his book, 1/75xNo.14 type 17 batten screw should be used. I am not even sure what kind of screw this is...

    batten-screw.jpg

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    Hmmm, they seem to be thin enough to avoid stud splitting. I suppose they should be fine then. Any opinions?

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    Quote Originally Posted by ptt102 View Post
    Hmmm, they seem to be thin enough to avoid stud splitting. I suppose they should be fine then. Any opinions?
    If you studs are pine no problems. If hard wood you just have to drill them. You said your place is brick veneer? They

    won't be long enough to get to the studs. Doesn't it specify on your drawings how the ledger attachés to the house?

  10. #10
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    The plan is to remove few rows of bricks, attach the ledger to the studs and after the pergola structure is in place repair the brickwork.

    The studs are hardwood. I was planning to pre-drill, anyway.

    The 1/75xNo.14 type 17 batten screws are 75mm long, right? The ledger is 45mm. That leaves 30mm to grab into the stud. Is that enough?

  11. #11
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    Batten screws come in different lengths. 100 mm would suit if you went with batten screws. Pre drill with a 4.5 mm or 5 mm bit. No bigger than 5 and no smaller than 4 mm or you run the risk of splitting the hardwood stud. And use 2 per stud, not one.

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    The plan asks for a ledger board 190 mm wide, so I was thinking of using 3 screws per stud. I hope that's not too many?

  13. #13
    4K Club Member ringtail's Avatar
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    3 is good. One in the middle and one 45 mm from top and bottom.

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    Great.

    Thank you to everyone. Heaps of great advice as usual.

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