[Jim Ignatowski]

Hello Everyone,

I'm looking for some advice. I'm building an 8x8 shed, and I need to attach a sill plate of PT 2x4 to a preexisting 9x9 slab. I'm planning to use Red Head or similar wedge anchors to attach the wood. The slab is 10" thick, I'm thinking of using 1/2" x 5.5" anchors. My question is probably a stupid one, but I'm trying to determine the best way to position my wood and drill the holes for the anchor. Is it recommended that I position my 8x8 frame on the slab, and then drill through the wood into the concrete with my hammer drill ?



My thought was to drill through the wood and start the hole in the slab - then remove the wood and finish each of the holes - blow or vacuum out the dust attach one side to the concrete and continue around until I have all four attached. Is there a recommended approach to this ?


Also - this concrete is really old (like 40 years +) with lots of aggregate - any recommendation on a high quality bit. I'm guessing that I might have issues getting through it.



Thank you in advance

 

[Nealtw]

presser treat plate is good but put a sill gasket under it anyway.
I would snap lines on the concrete for what will be the inside of the wall so you can check for square before you start. It will drill thru the wood I would line up the wood , stand on it and uses a 7" long bit. Then if the hole is not perfectly clean no one will know. Hammer the bolt in and go to the next bolt.

 

[stadry]

bosch bulldog or comparable class rotating hammer

 

[ron45]

Just my opinion.

I would use the power shots to attach the PT sill plate.

Then when the shed is done install your hurricane ties.

https://www.homedepot.com/s/power%20shots?NCNI-5

 

[Jim Ignatowski]

Thank Everyone ! I tried using Ramset on a similar slab a few years back and it just cracked a piece off . When I contacted them they recommended using an anchor or Tapcon due to the age of the concrete. Not sure if Power Shots are different ?

 

[Jim Ignatowski]

And I forgot to mention that I did purchase a sill gasket as I've read that is highly recommended - appreciate it

 

[SeniorSitizen]

Another option is Rockite made for what you're doing and I doubt if it will chip or damage old concrete.

 

[ron45]

Thank Everyone ! I tried using Ramset on a similar slab a few years back and it just cracked a piece off . When I contacted them they recommended using an anchor or Tapcon due to the age of the concrete. Not sure if Power Shots are different ?

I didn't mean the stapler.

I meant the ramset. When it first came to my attention way back when I called the power shot.

I never had any problems with it other then jolting the palm.

What color shot/.22 did you use.?

Color coding
Color coding Velocity
Gray 315 ft/s (96 m/s)
Brown 385 ft/s (117 m/s)
Green 490 ft/s (150 m/s)
Yellow 575 ft/s (175 m/s)