Through bolt anchor not grabbing

[arcon5]

Used a 16mm drill piece in to brickwork. All that happens is the whole anchor pulls back out instead of just the tapered but in to the side.

Instructions say 16mm hole.

What do you reckon try a 15mm hole or am I missing a trick?

 

[Mottie]

Chuck 'em away and get some studding and chemical anchor fix.

https://www.toolstation.com/everbui...lvUPra3UgDsqYJAw0sMaAoLfEALw_wcB&gclsrc=aw.ds

 

[TheDeuce]

You can pre-expand them a little so they're very snug on the drilled hole and then they'll grab as you tighten them - sometimes requires a little agitation to get them to grab initially. You'll find that a lot easier than reducing your already drilled 16mm holes to 15mm

Although as above, for all sorts of reason chem-fix is superior.

 

[Harry Bloomfield]

What do you reckon try a 15mm hole or am I missing a trick?

The depth of the hole is important, it needs to match the fixing, so the fixing bolt hits bottom. You need to put the bolt in, then hit it with an hammer to open it up to grip enough to be able to tighten against it fully.

 

[Deleted member 292770]

thru bolts arent the best to be fair. you could get rawl bolts that use the same size drill.

 

[oldbutnotdead]

If you've got an impact driver use that to start it off, usually works.
Of course if your masonry drill is a bit worn and the hole has wandered that won't help

 

[arcon5]

Thanks For all the replies guys. As usual you guys are amazing and helping a keen dryer. Just need to get my timber roof on so I can make use of the conservatory.

So I think I found the issue. The bricks I believe are fly Ash bricks (correct name?) so anchor bolts I suspect I just causing it to crack when knocking them through. See pic, we had a window cut out in to a door by a builder and this was in thr rubble... although they can't all be this style of brick as the two end bolts had no dramas and neither did the concrete screws used for mounting the conservatory frame to the wall. Are they only used at certain heights or something?

Are these chemical fixings suitable for this type of brick as I guess that's my only option really as I don't wanna nut and bolt the ledger as that means getting in to the cavity.

Is There anything I need to know about these chemical fixtures....? For example for a roof ledger board the anchors needed to be galvanised.... is there something specific I need to look for when shopping for this product to be used externally to carry the required weight? Is the intervals the same? As I was gonna anchor using zig zag formation between every joist (13 of them) although I do see every 600mm was the min but I'd rather over engineer than fall thorough putting my rubber roof on

 

[Harry Bloomfield]

Is There anything I need to know about these chemical fixtures....?

They really are the bees-knees of fixing, especially where the material is soft or difficult to get a clean hole. They are a little more expensive too.

 

[arcon5]

Thank, I think thats what I'm gonna have to do.

The ledger is already in place with a few anchors that seemed to go in perfect so can they be installed in situ?

From what I gather I can just insert the nozzle through the timber in to the masonry hole and fill it up, then insert the stud and bolt on loosely to hold it true but not tighten, then let it set?

Or are the sleeves I've seen a must? In which case can they go through the timber or are they just for if the timber was not fastened?

 

[noseall]

There could be hollow cavities in the masonry..?

 

[arcon5]

I'm fairly confident they are not air bricks tbh as I'd feel it when drilling in. And also looking at the rubble removed from where a patio door was cut below the ledger.

 

[arcon5]

Also does the resin have to be used on specific studs or can I use it with the anchors I have?

Has anybody on here used it before and if so did you do it with the material in situ or did you do it with the material being mounted removed?

 

[^woody^]

16mm? LOL. Is this a railway bridge
Is there any brick left to hold these in? That's your problem.

 

[arcon5]

16mm? LOL. Is this a railway bridge
Is there any brick left to hold these in? That's your problem.

Haha its funny you say that as I posted previously a question about my ledger board (not on here) and got beasted for using m12 on it so removed them and upped it to m16.

I've just ordered some high tensile galvanised m16 stud and resin as well so will be drilling 18mm hole now. .
They are strategically position though to avoid the mortar lines