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Thru bolts or Thunder bolts

  • 27-10-2021 8:49pm
    Registered Users Posts: 46 qaz123

    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


  • Registered Users Posts: 1,471 ✭✭✭ DBK1

    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.

  • Registered Users Posts: 2,231 ✭✭✭ Cavanjack

    Through bolts would be best for that job.

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

  • Registered Users Posts: 46 qaz123

    Thanks lads for the feedback

  • Registered Users Posts: 2,541 ✭✭✭ SuperTortoise

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

  • Registered Users Posts: 46 qaz123

    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

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  • Registered Users Posts: 2,541 ✭✭✭ SuperTortoise

    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.

  • Registered Users Posts: 9,657 ✭✭✭ patsy_mccabe

    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

    " And on the riverbank forgotten the river's name."