What are the best screws for securing EMT to concrete? I’ve tried Tapcon concrete screws for other applications, but they don’t seem to work well sometimes. Sometimes I've had them break on me, or not hold well.
Tapcons are the best IMO. If you do not use the correct size drill bit or do not blow out the dust from the hole, you can break screws. You must use care when installing this type of fastener. Follow the directions.
For a more permanent job, use "drive pins" or "nail in's" as we call them in the trade. You just drill the hole, insert the drive pin sleeve and hammer in the pin. Very secure, but can only be removed with a chisel and hammer.
if i'm not mistaken a 1/4 inch "drive pin" which i assume is our drop in anchors are good for 900lbs each. Agreed, they'll hold pretty much anything.
we mount almost all our stuff to concrete, any pipe smaller than 1 1/2" we use a quarter inch sds bit and ucan aluminum anchors with a number ten metal screw in them. They work exceptionally well but you have to pick your spots if using in block.
i'm so glad we don't use the plastic anchors any more. The ucans are much easier to use and hold more. For everyday house stuff though they should be plenty strong enough. I just always found them a pain in the butt.
tapcons are good too but take practice, if you mess it up even a little they won't hold right.
Most tapcon problems are user error. Make sure when you do the pilot hole its best to use a hammer drill with the masonry bit and make sure the bit doesnt "walk around" inside the hole
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