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Fixing a 75mm fence post to a brick wall


 
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mazdaq

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PostPosted: Tue Mar 06, 2012 8:21 am Reply with quote

I need to fix a couple of 75mm x 75mm fence posts to a brick wall. I've read some recommendations for thunderbolts. What length of bolt would I need to get a good strong fix?

I've also seen hex head bolts in screwfix - would they also do the job?
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Arthur2shedsJackson

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PostPosted: Tue Mar 06, 2012 10:45 am Reply with quote

Not really sure which screwfix product you mean.
Do you mean the hex head style thunderbolt as opposed to the style with the sunked torx head?
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mazdaq

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PostPosted: Tue Mar 06, 2012 11:11 am Reply with quote

These are the sort that I mean:

http://www.screwfix.com/c/screws-nails-fixings/hex-head/cat840404

Would these be suitable? If so which length would I need to get? 120mm?
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wrathkeg

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PostPosted: Tue Mar 06, 2012 11:22 am Reply with quote

I fastened two 3x2 posts with three of these (m8x100) on each, and they worked great. I guess I might have used something longer if the post was thicker.

http://www.toolstation.com/shop/Screws+Fixings/Steel+Anchors/d90/sd2040
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mazdaq (6 Mar 2012)
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Arthur2shedsJackson

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PostPosted: Tue Mar 06, 2012 11:26 am Reply with quote

I know that these bolts are good, we use this type all the time for floor fixing.
I've never used them through wood though, but I can't see why there would be a problem.

I would have said try and get at least 50mm into the wall, but you can achieve that with the 120mm bolts if you countersink the hole slightly ( drill out the size of the head) and that will hide the head too.

Why Thunderbolts ? Can you not remove the posts after drilling? I would tend to use a plug into the wall for this application, but if you have to laeve the post in place then use the thunderbolts, I'm definitely not a fan of frame fixings for this type of installation, they tend to come loose.

I assume that you are fixing the posts all the way up their length?
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mazdaq

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PostPosted: Tue Mar 06, 2012 11:36 am Reply with quote

Arthur2shedsJackson wrote:
I know that these bolts are good, we use this type all the time for floor fixing.
I've never used them through wood though, but I can't see why there would be a problem.

I would have said try and get at least 50mm into the wall, but you can achieve that with the 120mm bolts if you countersink the hole slightly ( drill out the size of the head) and that will hide the head too.

Why Thunderbolts ? Can you not remove the posts after drilling? I would tend to use a plug into the wall for this application, but if you have to laeve the post in place then use the thunderbolts, I'm definitely not a fan of frame fixings for this type of installation, they tend to come loose.

I assume that you are fixing the posts all the way up their length?


Only reason I was thinking Thunderbolts was I'd read a few people recommend them.

I can remove the post after drilling - would you use something like this to do the job:

http://www.screwfix.com/c/screws-nails-fixings/frame-fixings/cat840068

It's a 3ft fence so the post won't be particularly long - I was thinking of fixing it at 3 points along its length.
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Arthur2shedsJackson

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PostPosted: Tue Mar 06, 2012 11:43 am Reply with quote

No, They're what I wouldn't use.
They come loose when used on fence posts in my experience anyway.

I'd just use a normal wall fixing plug and contersink the hole about 25-30mm into the post, so that a 100mm scew would do. I like the rawlplug UNO ones, I find them superb in most applications.

But by all means use the thunderbolts, I just wondered why.

Good Luck icon_biggrin.gif icon_biggrin.gif icon_biggrin.gif icon_biggrin.gif
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mazdaq (6 Mar 2012)
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wrathkeg

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PostPosted: Tue Mar 06, 2012 11:46 am Reply with quote

well, when i used them it was just because the bloke at the fencing supplies place recommended them icon_smile.gif but they did work really well for my needs
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JohnD

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PostPosted: Tue Mar 06, 2012 3:42 pm Reply with quote

can you get to the other side of the wall?

makes it much easier to get a really strong fixing, using studding.
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