Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-18-2009, 12:01 AM   #1
Newbie
 
Join Date: Jul 2009
Posts: 4
Share |
Default

How to choose contractor


I am designing a layout for some weightlifting platforms in a gym. This gym is a warehouse with concrete floors, and while building the wood platforms on top of the floor is common, it would be so much nicer to recess the platforms flush with the floor. What type of contractor can do this?

sipy is offline   Reply With Quote
Old 07-18-2009, 07:12 AM   #2
Lic. Builder/GC/Remodeler
 
AtlanticWBConst.'s Avatar
 
Join Date: May 2006
Location: New England
Posts: 7,556
Default

How to choose contractor


You want an experienced Concrete/Masonry contractor - to look at the project.

Just realize that this is not a simple "lowering the floor" project.

AtlanticWBConst. is offline   Reply With Quote
Old 07-18-2009, 12:03 PM   #3
Tool Geek
 
PaliBob's Avatar
 
Join Date: Jun 2008
Location: Pacific Palisades CA
Posts: 2,505
Default

How to choose contractor


Quote:
Originally Posted by sipy View Post
.....be so much nicer to recess the platforms flush with the floor.......
Isn,t this an Oxymoron?
.
__________________
Disclaimer
& Stay Safe
.....Bob Lavery

Last edited by PaliBob; 07-18-2009 at 12:09 PM.
PaliBob is offline   Reply With Quote
Old 07-18-2009, 12:03 PM   #4
RTA Studio Architects
 
rltarch's Avatar
 
Join Date: May 2009
Posts: 5
Default

How to choose contractor


Assuming the concrete slab is poured on grade (this isn't a second floor, is it?) then you will be cutting through and removing the slab; digging down a bit, and pouring a new, lower slab.

Sounds easy, but the particular conditions of the building and soil may complicate things. For example, it may be a very thick slab; it may be a reinforced slab; and there may be drain tile, electrical conduit, or other utility lines running through or underneath the area where you want to excavate.

You may also find that removing the existing slab allows the gravel base to "run out" from under the slab edges that remain - your contractor will then have to form the edge of the existing slab and inject grout underneath to support the edges.

If you have the budget for it, I agree, this would be very nice! It would also be very easy to do in new construction. But unless you're financially prepared for "problems" that you probably won't know about until it's too late, I'd recommend the raised platform option!

Hope this helps,

Richard Taylor, AIA

Last edited by rltarch; 07-18-2009 at 12:10 PM. Reason: misspelling!
rltarch is offline   Reply With Quote
Old 07-18-2009, 12:57 PM   #5
Licensed P.E./Home Insp
 
Aggie67's Avatar
 
Join Date: Dec 2008
Location: New Jersey
Posts: 587
Default

How to choose contractor


We've done similar work in chemical plants on their concrete floors, but it was for mounting weigh stations and scale decks flush with the concrete floor. You take out the part about the type of building and the thing you're installing in the recess, and it's basically the same job. Pits were recessed down 4 inches.

Watch out for utilities, rebar, grade beams, footings, etc.
Aggie67 is offline   Reply With Quote
Old 07-18-2009, 12:58 PM   #6
Newbie
 
Join Date: Jul 2009
Posts: 4
Default

How to choose contractor


Thank you Richard.

Your outline of potential problems is pretty convincing. I will probably abandon the idea and build on top of the floor.

Anyway,

If the concrete slab was thick, is it possible that a cut-out ~five-inches deep would leave enough concrete to support the platform(s)? Probably, there is no way to make a "cut-out" without removing concrete through the entire depth of the slab. (?)

What are the chances of getting the specs of the existing floor (thickness, reinforcement, pipes and conduit) to identify problems in advance? (Its a warehouse amongst similar buildings in the area/district)

Jeff
sipy is offline   Reply With Quote
Old 07-18-2009, 01:05 PM   #7
Newbie
 
Join Date: Jul 2009
Posts: 4
Default

How to choose contractor


Aggie,

You answered my question about the pit as I was typing it. Would the original contractors have filed the specs on utilities, rebar, grade beams, footings, and related, somewhere for future access?
sipy is offline   Reply With Quote
Old 07-18-2009, 04:04 PM   #8
Licensed P.E./Home Insp
 
Aggie67's Avatar
 
Join Date: Dec 2008
Location: New Jersey
Posts: 587
Default

How to choose contractor


Depending on how old the building is, there should be drawings at the town. I'm doing some stuff for a country club that Trump bought and converted into a "Trump National at fill-in-the-blank", and you'd be surprised what the towns keep on file. Even if you went there and get the company name off the title block of any drawing, you have a decent chance of back tracking to the original firm. Also, you can generally tell where grade beams and footings are located by the layout of the structure. Conduit is a different story.

Trying to hog out poured concrete to make a shallow pit in the slab is not too viable. I'd try to talk you out of that idea if I was working for you.
Aggie67 is offline   Reply With Quote
Old 07-19-2009, 02:44 AM   #9
Newbie
 
Join Date: Jul 2009
Posts: 4
Default

How to choose contractor


Quote:
Originally Posted by Aggie67 View Post
Trying to hog out poured concrete to make a shallow pit in the slab is not too viable. I'd try to talk you out of that idea if I was working for you.
But you used to do it? : "Pits were recessed down 4 inches"

Is it much easier to break all the way down through the concrete, and then build back up to floor level? Do you pour new concrete to bring the pit back up to desired depth?
sipy is offline   Reply With Quote
Old 07-19-2009, 07:53 AM   #10
Licensed P.E./Home Insp
 
Aggie67's Avatar
 
Join Date: Dec 2008
Location: New Jersey
Posts: 587
Default

How to choose contractor


With scale pits, we saw cut the slab into a checker board, pick the pieces out (no jack hammering required beyond the first couple pieces if you do it right), excavate down, and prep the base. I've never tried to gouge out concrete. Too much wear on the equipment, too many questions about weakening the slab, too labor intensive, I know I'd run into rebar, etc. If it was just a shallow drainage channel around a machine, sure I'd do it. But to gouge out 4 inches from a 6 ft by 6 ft square, I'd never do that. Doing it properly (saw cut, excavate, base, pour) will leave you with a properly reinforced cut out in your slab.

Also, with scale pits, there is a metal lip going all the way around the edge. That metal lip doesn't get bolted onto the cut edge of the original slab. We make the hole wider, drill and install rebar pins in the face of the cut, install the rebar grid for the new concrete, and lay the metal edging in. That metal edge becomes our pour stop.

Aggie67 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Choosing a contractor Grumpy Remodeling 7 04-28-2011 07:29 AM
Contractor price fair or not? ekle General DIY Discussions 39 05-11-2008 07:27 PM
Metal roof??? Tdoggy187 Roofing/Siding 51 03-04-2008 03:35 PM
Ethics? Contractor and Employer responsibilities boodog Off Topic 6 10-08-2007 09:07 AM
Newbie to roofing-How to choose shingle, contractor? Piper Roofing/Siding 7 07-09-2007 01:25 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.