Thru bolts or Thunder bolts

qaz123 · 27-10-2021 09:49PM #1

Looking for some advice. Putting up a small roofed area 4m X 4m with 8ft high RSJ. Wondering what's thes easiest way to bolt them to concrete floor. Was thinking of using thunderbolt .

Wondering are they strong enough or would through bolts be better.

How long would I want to let concrete cure before drilling and fixing baseplates

DBK1 · 27-10-2021 10:07PM

https://www.boards.ie/discussion/2058215172/thru-bolts-or-thunder-bolts

I definitely be using the thru bolts for something like that. They'll be about twice the price but for the size of a shed you're talking about its only going to be an extra €70 or €80. Thunder bolts are fine for hanging a small gate on a mass concrete wall but anything more than that I wouldn't trust them.

Concrete should be left 28 days to harden but you'd probably get away with it a week or 10 days sooner than that.

Cavanjack · 27-10-2021 10:07PM

https://www.boards.ie/discussion/2058215172/thru-bolts-or-thunder-bolts

Through bolts would be best for that job.

Id be giving the concrete a couple of weeks before drilling.

qaz123 · 28-10-2021 09:23PM

Thanks lads for the feedback

SuperTortoise · 29-10-2021 08:35PM

Thru bolts or threaded bar and chemical anchor are your 2 options.

qaz123 · 30-10-2021 05:17PM

https://www.boards.ie/discussion/comment/118091791#Comment_118091791

Haven't used chemical anchor before. What size threaded bar would you recommend. M12 would suit holes in steel baseplate but could enlarge them if I needed M16

Might work best because baseplate near concrete edge afraid thru bolts might crack concrete

SuperTortoise · 31-10-2021 09:18AM

Just be aware if you go for chemical anchor you'll need to drill out a 20mm hole for a 16mm threaded bar, don't know if that would suit existing baseplate holes or not, even if you go for thrubolts I would use m16 for that size shed.

patsy_mccabe · 31-10-2021 10:34AM

careful with threaded bar , as strength probably unknown. At least with regular bolts, you will see the strength stamped on the heads, 8.8 10.9 12.9 etc

Thru bolts or Thunder bolts

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