Browse Forums Building Standards; Getting It Right! Re: Decking joists splitting 5Jan 10, 2020 8:50 am The joists have split as the screws are off center. Some of the joists have the screws 10mm from the edge of the joist. If it was just on the odd board it wouldn’t be an issue. But since it’s the entire way along the joist this is what has caused it to split. Do you know that the Australian Standards are? I can only find references to nails having to be centered and no mentions of screws. Also what are the standards around preventing wood from splitting and how big can a split be? Cheers Decking joists splitting 6Jan 10, 2020 10:28 pm Off centre screws has not caused this, it is probably due to a number of factors. Screws are best staggered as in not lined up as it is least likely to split the joist, it just looks worse. There is no standard but agree should be fixed, maybe the holes were underdrilled , hard to pin point exact cause. It looks much older than 6 months the coating looks like it is failing and the hoist has silvered, was the timber new when installed? Re: Decking joists splitting 7Jan 25, 2020 1:13 pm Sorry that was a typo. It’s almost a year and a half since installation. The problems started within a year of it being installed. Just having issues with the landscapers coming out to rectify. I took up one of the boards and the issue is worse than I thought. I’ve been trying to read the standards but there’s a few so not entirely sure which ones are specific. But it seems that screws have to be a minimum of 12.5mm from edge of boards, assuming this would be the same for joists, spacing has to be 8mm for wide boards. The average board spacing is about 4mm. Which is probably why they cupped so much pulling up the screws. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Hi, as per the subject. Does anyone have any recommendations for the best value decking oil (Bunning is close to where I live) for a treated pine deck? Thanks 0 10970 Hi All, about to commence a bathroom renovation and need some advice on subfloor works. Current subfloor is hardwood T&G floorboards on 90x45 joists, but intention is to… 0 5820 Thanks for all replies. I just noticed now the pictures I added to post right on top of page were wrong. I attached pictures showing "current" and my "suggested" floor… 9 14627 |