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If you are putting down a wood sill plate this came from a concrete pro. Take a 1/8th inch concrete drill. Lay out the wood on the floor and drill into the concrete, remove the wood and finish drilling.
Get some 16 penny COATED nails. Put the wood back and use TWO nails per hole and hammer just like you would into wood. You will never get it back out with out busting the wood so make sure it is where you want it.
I use this all the time for anything I mount to concrete and it works great. Just make sure the dust or most of it is out of the hole. You can not remove the nails after you start hammering them in so be sure thats what you want mounted or you will have to bust it apart.
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