I am building a new fence on a stone wall and plan to attach the posts with bladdubb from Gunnebo.
A wedge comes with these, but is anything else like a chemical anchor needed for them to hold? Or is it enough just to drive them into a hole? And which drill should I use when the plug is Ø19mm?
Guessing, you drill a 19 mm hole that is at least as deep as the round part, 100 mm, insert the wedge into the groove on the bolt, lengthwise, drop the bolt into the hole and hit it with a sledgehammer. The wedge will then press apart the lower part of the bolt and lock against the stone. Without chemicals.
But I'm just guessing.
There is no risk that water will come down and freeze if you don't "seal" with something? And if you drill more than 100mm, the wedge won't reach the bottom of the hole, which in turn means it won't get wedged in?
It will certainly come down as water and freeze, but it probably won't matter since it's not going to be in particularly large amounts. You can certainly smear some sealant afterward, but it's designed to adhere on its own, otherwise you can just use chemical anchors and a suitable fastener. If it's not an elephant fence you're building, you probably don't need both.
There are two dowels for each post, my plan is to take a small piece of the post and screw it on with a through bolt and nut, then mark where the holes should be on the stone. Then drill/clean and use a sledgehammer so that both dowels are at the same height, and then replace the piece of wood with the real post.
Bought the studs yesterday and have measured them a bit, and including the thread they are larger than 19mm, they are a bit oval but at most 20.5mm. Would it then work with a 20mm drill (since I already have one)? Or should I go up to 21mm or 22mm?
Where did you check that? Can't find anything on Gunnebo's website
[link]
equivalent product with the same diameter.
but you can try. make a hole in some "wood piece" if you think the play is too much, then go down in diameter.
but remember that the bladdubb will expand.
equivalent product with the same diameter. but you can try. make a hole in some "wood piece" if you think the play is too much then go down in diameter. but keep in mind that the blade pin will expand
Ok, thanks for the help. I found about the same info myself, but 23mm to Ø18 pin. Maybe it's not so critical but I don't want to get a gap so the post becomes wobbly...
There are two bladdubbar (dowels) for each post, and my plan is to take a small piece of the post and screw it with a through bolt and nut, then mark where the holes should be on the stone. Then drill/clean and hammer with a sledgehammer so both dowels end up at the same height, and then replace the wooden piece with the actual post.
Do you think this will work well?
The question is whether this will work? It might be difficult to align the holes exactly to get a through bolt/threaded rod through. The stone blocks aren't very flat, and it feels like it varies a bit how the bladdubbar are wedged...
I've considered using French wood screws instead. But then I read that some people think they're unreliable because it's easy to snap the head off, while others think they're good... So I'm not quite sure what to do...
I have now set three posts for my fence. I used a Ø22mm drill, but it’s on the edge of making the holes too large. There's a slight tendency for them to be loose at the top of the hole. Which isn’t surprising since the wedge locks at the bottom of the hole.
I also tried with a Ø20mm drill that I had at home, but then I couldn’t even get the plugs into the hole. So I’m going to buy a Ø21mm for the remaining posts and hope that it works well.
I also noticed that it was really hard to align the holes in the plugs, and using a wooden block to hammer them down didn't work... But I've been using Essves HEX wood screws instead, and it seems to be good (I think).
