ironstein Posted May 15, 2012 Share Posted May 15, 2012 I am installing a French quarter gas lamp with post and a forged sign hanger for a client. Anyone have any recommendations for a type of fastener that works well with slate rock flooring? (null) Quote Link to comment Share on other sites More sharing options...
doc Posted May 15, 2012 Share Posted May 15, 2012 How thick is the stone your anchoring to? Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 Not sure. I've requested info on the floor. I'm pretty sure it's concrete underneath, there is an underground parking structure and I believe 3 floors above that. I need to make sure there are no post tension cables, I don't want to drill into the floor and create a catastrophe. (null) Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 Just curious if anyone used any special anchoring system I hadn't heard of, I'm sure I can just use masonry screws. (null) Quote Link to comment Share on other sites More sharing options...
Farmweld Posted May 15, 2012 Share Posted May 15, 2012 I've used chem-set anchors for a few things and they seem to work fairly well. Andrew Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 I'll look into them thanks. (null) Quote Link to comment Share on other sites More sharing options...
Francis Trez Cole Posted May 15, 2012 Share Posted May 15, 2012 slate is very a soft stone Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 Good to know. Soft in that it cracks and crumbles? Or soft in that it drills easily? I'm gonna hit up Delta stone, they have supposedly the largest rock saw west of the Mississippi, they may know a thing or two! (null) Quote Link to comment Share on other sites More sharing options...
pkrankow Posted May 15, 2012 Share Posted May 15, 2012 Good to know. Soft in that it cracks and crumbles? Or soft in that it drills easily? I'm gonna hit up Delta stone, they have supposedly the largest rock saw west of the Mississippi, they may know a thing or two! (null) Maybe it cracks and crumbles, maybe not. Yes, it is easy to drill. I have run tapcons into slate before with mixed results. If the slate is thin you want to fasten to what is behind the slate. I have also cut "thin" slate tiles with a hacksaw with little effort while installing. Phil Quote Link to comment Share on other sites More sharing options...
clinton Posted May 15, 2012 Share Posted May 15, 2012 You will want to get through the slate and into the concrete. I would try using a masonry drill bit with a normal drill motor to get through the slate, then use a roto-hammer to drill the concrete. The lead anchors with lag screws hold well. You could have a testing lab come out and locate any post-tension cables or re bar before drilling Quote Link to comment Share on other sites More sharing options...
Sask Mark Posted May 15, 2012 Share Posted May 15, 2012 When we have to locate reinforcing in slabs we pay around $300 to have it x-rayed. I would personally consider epoxy anchors as you don't have to go very deep with them. They are very strong. Quote Link to comment Share on other sites More sharing options...
Fe-Wood Posted May 15, 2012 Share Posted May 15, 2012 I would go with epoxy too and have the re enforcment located by other. Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 Thanks for all the replies. It turns out the floor is slate tile, backer board or thin concrete with 3/4 plywood subfloor underneath. Looks like i'll have to drill through the slate and concrete board and lag into the sub floor. There are wood trusses supporting the subfloor with around two feet of space under the plywood. Glad its not post tension cables! Quote Link to comment Share on other sites More sharing options...
Sask Mark Posted May 15, 2012 Share Posted May 15, 2012 Hey Brian, you would know this. I always thought most post-tension cables run on the bottoms of the slabs for tensile strength to prevent too much slab sagging. Do you see many of them at the top of the slab? Quote Link to comment Share on other sites More sharing options...
jkmas Posted May 15, 2012 Share Posted May 15, 2012 My 2cents worth: Make sure that there is not any heating tubes under the slate. Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 Mark, The cables are profiled low between spans and profile to the top of the slab (3/4" to 1" from finish floor) over supports like beams, girders and columns. This creates lift when tensioning. (null) Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 There are also what are called "temperature" tendons which usually run in the middle of the slab with no profile for crack prevention, these are running perpendicular to the profiled cables. I once built a post tension slab that was 4 feet thick The profiles were reversed to provide lift at the columns. In other words they were profiled low underneath column reinforcing, and high at mid spam. (null) Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 Mid span. Now you know more about post tension cables than you wanted! It was very interesting and challenging work. I use a 10,000 psi pump for my hydraulic press that is exactly like what we used to tension cables. (null) Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 15, 2012 Author Share Posted May 15, 2012 Hey Mark, Utah is beautiful! I've got a pretty nice shop set up, you need to come visit so we can put Thelma, my Anyang 88 through its paces. The thing hits hard! We just rented a cool cabin in the mountains, there will be room if you wanna come visit. (null) Quote Link to comment Share on other sites More sharing options...
Sask Mark Posted May 16, 2012 Share Posted May 16, 2012 It's on my short term bucket list Brian! I enjoyed south Idaho when I traveled for work. Flying into SLC looked beautiful. Maybe you can show me how you make those awesome damascus bracelets and spurs. Quote Link to comment Share on other sites More sharing options...
ironstein Posted May 16, 2012 Author Share Posted May 16, 2012 Definitely. I'm getting into some more complicated Damascus patterns that are teaching me just how little I actually know, kind of humbling! I'm having fun though. It sure beats carrying steel on my shoulder all day. I had back surgery a few weeks ago, bad career choice being an Ironworkers for 17 years. (null) Quote Link to comment Share on other sites More sharing options...
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