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koko
Jan 17, 2003, 5:14 PM
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whats the best way to atatch a 2x4 to a concrete floor so i can build up the framing on that?
[ This Message was edited by: koko on 2003-01-17 09:15 ]
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no_limit
Jan 17, 2003, 5:17 PM
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Drill into the floor and use glue in bolts, or something similar. Some type of masonary bolt would work well.
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coldclimb
Jan 17, 2003, 5:35 PM
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They have concrete nails for that. Just really stout nails that you pound really hard and hope they don't shatter.
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jvanick
Jan 17, 2003, 5:51 PM
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You can also get screws that are made for drilling into concrete.
Most homecenters and hardware stores carry them under the name 'Tapcon' they look like blue phillips head screws.
Or if you like the loud gunshot type sounds, you can get or borrow a ramset (it shoots special nails into concrete with either a .22 or .45 caliber shell)
-J
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jorgle
Jan 17, 2003, 5:53 PM
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There are heavy duty nail guns that use blasting caps that can be rented from industrial/construction warehouses. It will drive a nail w/ integral washer through the 2x4 and into the concrete.
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sligoblues
Jan 17, 2003, 5:54 PM
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I'd advise going with the masonry bolt. You drill the hole, pound it through both. You only need a couple to make it solid, especially if it's to be load bearing. I did it for my woodie and only needed three per eight footer, and it still felt like overkill.
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baywolf
Jan 17, 2003, 6:31 PM
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I agree, your best bet is to use a masonry expansion bolt, like the ones used in climbing. you can buy zinc coated bolts @ any hardware store, I use redheads @ work and they are very secure. I would recomend you go with 3/8-1/2" bolts. good luck.
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zetedog
Jan 17, 2003, 7:14 PM
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All of the heavy duty nail guns is a bit of over kill. When I worked construction in college, it was common practice to use an adhesive when we were finishing out basements to attach framing to the ground for walls, and it was up to code. There are several that you can use with a standard calk gun. This stuff is easier to use than industrial nail guns, and there is the possibility of cracking your cement when you use them. We would only drill if the customer absolutely insisted on it and after we told them of the risks.
I can't think of any names we used off the top of my head right now but I think they were pretty similar to liquid nails. They all had shear strengths equal to most lag bolts if you apply it properly (for both bolt and glue, the 2X4 is much more likely to splinter before either gives up).
I can't comment on the removal of this stuff, but I figure it would be as permantely damaging to concrete as drilling holes in it.
If you are trying to connect to a concrete wall, I would defintely advise drilling, but in the floor, I can't think of a climbing wall situation where it would be better.
Todd
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boardcrazzy
Jan 17, 2003, 7:30 PM
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I used the cement nails. Just pound them into the wood till they hit the concrete. Then you only hit them once hard with a 3 lb sledge or the back side of an axe. If you hit them more than once you risk bouncing them out. Super easy.
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rprp
Jan 18, 2003, 9:46 PM
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If nothing is going to push sideways with much force or pull up, then do the glue or the hammer-in nails talked about above. The other ideas are more than you need and will take more time. For the glue, make sure the concrete is very clean and doesn't have scale. You might use pressure treated wood if the floor tends to get flooded.
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meataxe
Jan 22, 2003, 1:07 AM
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I'd go with a hammer drill, masonry bit and Tapcons.
Everybody should have a hammer drill.
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drector
Jan 22, 2003, 1:26 AM
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For attaching to the floor, consider a wood extension on the floor out from the bottom of a wall with the anchoring done to the wall and not the floor. The weight of the your woody would keep it on the floor and the attachment back to a wall will keep it from moving.
(Sorry this isn't an answer to the exact question but it seemed like a useful idea if it is applicable)
Dave
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clymber
Jan 22, 2003, 1:31 AM
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there are afew ways you can do it....you can go with the nail idea or you can get the hammer drill and then use expansion bolts in it....i install cellular sites and if expansion bolts work good enough to hold up equipment that weights 500+ lbs then it will be good enough for a wall...just make sure you drill the holes deep enough cuz the bolts are almost imposible to get out ones they have been put in the holes
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jerrygarcia
Jan 22, 2003, 1:33 AM
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Meataxe has it.
hammer drill + tapcons = happy you.
When I was into carpentry, we did use concrete nails and a heavy hammer for nailing bottom plates of walls to the floor, its a cheap method but id recommend using ALOT of nails.
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bakedjake
Jan 27, 2003, 7:52 PM
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tapcons are less intrusive than a 3/8" or 1/2" expansion bolt though both are on target. I've got a lot of years in placing [for construction app's]bolts in concrete. I would go with a lead shielded expansion bolt 1/2" diameter. You'll need to drill approx a 3/4" hole. You are going to need to add some torsion to take any lateral resistance as the bolts are for straight up & down and shifting forces.
"Gravity is a harsh mistress." - The Tick
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reborne
Jan 27, 2003, 8:10 PM
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get masonry nials all you need is a hammer
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