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    Concrete fixings, screws vs raw plugs

    I need to put a bicycle rack up in the garage. The garage is made of concrete slabs. Is it better to go with traditional raw plugs with screws or screw anchors like these: blackanddecker.co.uk/en-…018

    11 Comments

    I'd go with rawl (spelt with an L on the end) plugs personally as driving a screw direct into concrete has a higher risk of cracking than drilling then putting a screw into the rawl plug. That said, I'm sure either method would be fine.

    Original Poster

    Scorpion

    I'd go with rawl (spelt with an L on the end) plugs personally as driving … I'd go with rawl (spelt with an L on the end) plugs personally as driving a screw direct into concrete has a higher risk of cracking than drilling then putting a screw into the rawl plug. That said, I'm sure either method would be fine.


    I think the screw anchor uses a pre drilled hole , I will probably end up using a rawl ( spelt wit an L) sorry for the omission, lol. but I wonder how good these screws really are.

    Thunder Bolts would be my choice. Other brands are available

    krisward7955

    Thunder Bolts would be my choice. Other brands are available



    Clever name.

    Wasn't trying to be clever.

    rhinopaul

    \x09\x09\x09\x09\x09\x09I need to put a bicycle rack up in the garage. … \x09\x09\x09\x09\x09\x09I need to put a bicycle rack up in the garage. The garage is made of concrete slabs. Is it better to go with traditional raw plugs with screws or screw anchors like these: http://www.blackanddecker.co.uk/en-gb/product-repository/products-blackanddeckereanz-gb/2016/07/10/19/20/m30018



    Pre-fab concrete garage?

    Are the panels thick enough for a rawl plug or hammer fixing as suggested above?

    I opted for a simple long bolt, (or threaded rod) nut and large repair water inside and out, (does require assistance though to tighten the nut / hold the bolt), simply cut/grind the excess bolt off for a tidier finish.

    Little dab of sealant behind the washer ensures no water ingress.




    Edited by: "andynicol" 18th Apr

    Original Poster

    andynicol

    Pre-fab concrete garage?Are the panels thick enough for a rawl plug or … Pre-fab concrete garage?Are the panels thick enough for a rawl plug or hammer fixing as suggested above?I opted for a simple long bolt, (or threaded rod) nut and large repair water inside and out, (does require assistance though to tighten the nut / hold the bolt), simply cut/grind the excess bolt off for a tidier finish.Little dab of sealant behind the washer ensures no water ingress.


    Possibly prefab but its French for starters, lol. The slabs/panels are about 2.5" thick but they are also part of a block so I cant get to the other side. The strange thing or maybe not is that they sound hollow when you tap them but when I tried to drill through the other day using a hammer drill I really struggled and stopped to look for a better bit.

    You may find it near impossible to drill the block if the concrete is of the really hard type

    rhinopaul

    Possibly prefab but its French for starters, lol. The slabs/panels are … Possibly prefab but its French for starters, lol. The slabs/panels are about 2.5" thick but they are also part of a block so I cant get to the other side. The strange thing or maybe not is that they sound hollow when you tap them but when I tried to drill through the other day using a hammer drill I really struggled and stopped to look for a better bit.


    They may be hollow, but they will have reinforced strips throughout I should imagine, where the concrete is solid.

    Rawl plugs will be fine strength wise, personally I would prefer these to the others you have, once you have the hole you know it will work, the screw anchors can have problems.
    I would be more worried about the concrete slabs cracking when drilling. I wouldn't drill near to the edges and be a bit careful what kind of hammer drill you use, a softer type hammer would be what I'd choose if I had the choice. A percussion instead of a SDS for example.

    I would also vote for rawl plug as the plastic plug will give you a secure fixing.
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