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Old 12-21-2010, 04:12 PM   #1
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affixing PT 2x4 sole plates to concrete foundation


hi, i have an 11x9 concrete slab that i am getting ready to build a shed upon. the foundation footer is 2 ft deep and 10" thick, the slab inside is about 3-4" thick.

i am wondering whether i should use power-actuated 3 in nails to affix the 2x4 sole plates, which would be the easiest, or drill holes in concrete and fasten them with bolts and anchoring epoxy. one problem i've had in the past with nailing wood to concrete near an edge (which would also be the case here) is that it can chip the side of concrete if too close, within an inch or so. holes/bolts require more calibration and is more intensive to do but the side of concrete would be safe.

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Old 12-21-2010, 04:23 PM   #2
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affixing PT 2x4 sole plates to concrete foundation


Not sure of all the variables here but I would go for a 1/2" diameter bolt or rod epoxied into the concrete. Just be sure you clean out the drilled hole before you start placing the epoxy.

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Old 12-21-2010, 04:49 PM   #3
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affixing PT 2x4 sole plates to concrete foundation


You can also use bolts that are friction fit in the hole.
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Old 12-21-2010, 05:06 PM   #4
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affixing PT 2x4 sole plates to concrete foundation


You did not indicate where you are located. If in a cold environment, the epoxy is not going to work until Spring. I like the 38 Ramset tools (I assume you meant powder actuated, not power actuated, which is a different beast entirely), however as you indicated you are likely to crack the concrete if you are not at least two, better yet 3 inches in from the edge.

If closer to the edge, you can certainly use expansion anchors like a Phillips Redhead, just takes a little longer than a powder actuated pin. Some people here like Tapcons, I don't particularly like them for heavy duty fastening. The old fashioned option is drill and use lead shields, they work OK also.
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Old 12-21-2010, 05:09 PM   #5
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affixing PT 2x4 sole plates to concrete foundation


yes, POWDER-actuated, sorry. they have fast-set anchoring epoxy too, will that work better in cold weather ?
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Old 12-21-2010, 08:10 PM   #6
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affixing PT 2x4 sole plates to concrete foundation


Hi

Your second option is best - resin anchors, as they put no tensile load on the concrete.

As for weather conditions you will need to check the spec on the product and find one that is suitable or put the job off to a warmer time of year.

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GJ
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Old 12-21-2010, 09:28 PM   #7
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affixing PT 2x4 sole plates to concrete foundation


Frame the walls, tip them up, pin with ramset, then drill 4' oc for wedge anchors

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