Holes Too Big For Bolts? Do I use Anchor Resin Too?

[HugeWesty]

So I'm fixing an awning to the side of the wall, it required 14mm size holes - however due to difficulity getting leverage drilling up high, my arm wobbled a bit - end result is when I go to put the bolts in the holes, they aren't tight enough to need a hammer - I can push 4/6 of them straight in with a little shove. See pictures for tightness.

I've never used these anchor bolts before, will the tightness be ok once I tighten - or should I look at some alternative - e.g.

• Put some chemical resin in the hole too just before fixing?
• Shove some matchsticks/wooden skewers alongside to make tighter? Does this work with bolts like this

I don't want to re-drill holes (as all lined up perfectly etc). Thoughts appreciated.

 

[Swwils]

Big fan of chemical anchor and just using plain studs.

 

[JohnD]

the resin wil be a permanent job. Matchsticks would be a bodge and rot out, and not strong.

The resin is used with stainless studding for serious concrete work, very strong and long-lasting. I don't know if expanding bolts are suitable with it as they work on a different princible, and the threads would get bunged up.

Stainless nuts and washers are needed as well because this is not a job you ever want to fail and repair.

 

[Deleted member 174758]

Resin should be used with resin anchors or deep threaded cut studding as it needs to "key" to the study's thread. At best with a shield anchor you'd get a weak connection, at worst you'd need to tighten the anchor which would risk breaking up the resin.

Note that on resin anchors you only need to drill 2mm larger than the studs, I.e 14mm holes for a 12mm studs. Any steelwork should be drilled 2mm larger than the studs to give a bit of shimmy room and installed with washes on the studs. Going to very big holes for the studs is not only wasteful of expensive resin, but also risks producing a stud with poorer pull out resistance

 

[HugeWesty]

Thanks all. I'll keep with the expanding bolts - if the current 14mm dont tighten, I will buy some 15mm/16mm and drill slightly wider - ensuring I keep my arm straight and true which should be easier with a 14mm pilot hole so to speak

 

[Mottie]

I hung some 8 ft gates on some 9” concrete posts for my yard. The old rawl bolts were always coming loose. I just used the centre stud of the new rawl bolts with some chemical anchor. Worked perfectly.

 

[mattylad]

Did you not use a ladder or platform?

 

[foxhole]

You shouldn’t need hammer to put them in just tighten them. They expand several mm.

 

[SpecialK]

Hold the collar on the wall and yank the thread out. Then tighten them?