Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-31-2007, 11:21 AM   #1
Newbie
 
Join Date: Jul 2007
Posts: 16
Share |
Default

Hardwood over concrete slab


I'm going to install my hardwood flooring over 3/4" CDX plywood . The plywood will be installed over the concrete slab. My only real option is to nail the plywood using concrete nails. What length of concrete nail should I use, and will these nails really keep the plywood in place "forever"? Also, since I don't have floor joists to determine which direction I have to lay the hardwood, is there a rule of thumb ? Gracias

El Buey is offline   Reply With Quote
Old 07-31-2007, 08:28 PM   #2
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 3,950
Default

Hardwood over concrete slab


I think you should re-think this method. Plywood should not be installed over a slab. It will in time absorb moisture, even when the concrete seems dry. If that happens, it will all buckle. Also, how would you fasten the hardwood? The regular cleats are 2" long driven on an angle.

There might be a way to install 3/4" solid hardwood over a slab? But I don't think this is it.

Jaz

JazMan is offline   Reply With Quote
Old 07-31-2007, 11:58 PM   #3
Member
 
Join Date: May 2006
Posts: 73
Default

Hardwood over concrete slab


You have to apply a vapor barrier of asphalt felt or building paper using mastic on the slab first and then another layer of polyethylene film and then you secure the 3/4" plywood to the slab using power-actuated fasteners. OR you can simply buy engineered hardwood planks and glue them directly onto the slab.
Krichton is offline   Reply With Quote
Old 08-01-2007, 07:12 AM   #4
Newbie
 
Join Date: Jul 2007
Posts: 16
Default

Hardwood over concrete slab


Thanks for your insight! I did not mention that I was going to lay polyehtylene barrier over the slab first. then the CDX (exterior) plywood, then asphalt felt. THEN the hardwood. I have been to various websites ("how to install hardwood flooring over concrete slab") and they all recommend this method as one of two methods. I live in Costa Rica and the "experts" here want to embed 2x2's in the fresh slab, then nail the flooring to the 2x2's. I nixed this idea immediately until I investigated futher. And power actuated fasteners? Dudes, construction guys here cut rebar with a hacksaw, and most still mix their concrete by shovel. Now the JazMan has introduced "2 inch cleats" into the formula! Any more suggestions will be appreiated-or maybe I should go with a basic compact dirt floor! El Buey
El Buey is offline   Reply With Quote
Old 08-01-2007, 09:30 AM   #5
Member
 
Join Date: May 2006
Posts: 73
Default

Hardwood over concrete slab


Why don't you just buy indoor outdoor carpeting? You know the fake grass one and call it a day?
Krichton is offline   Reply With Quote
Old 08-01-2007, 10:39 AM   #6
Member
 
Join Date: Jan 2006
Location: Toronto, Canada
Posts: 1,861
Default

Hardwood over concrete slab


If you nail the hardwood onto the 3/4 plywood which stick to the concrete... you basically has approx 1/2 to 3/4 nailing depth for the hardwood... I wonder this is good enough depth for the hardwood to stay solid...
KUIPORNG is offline   Reply With Quote
Old 08-01-2007, 03:08 PM   #7
Newbie
 
Join Date: Jul 2007
Posts: 27
Default

Hardwood over concrete slab


I laid down asphalt, vapor barrier, 3/4" plywood, and 3/4" brazilian cherry when I lived in Florida. I lived there two years, and it seemed fine. I secured the plywood to the concrete with about 16 tapcon screws in each sheet. It was a pain, but the floor did not squeek at all!

Brian
bjherron is offline   Reply With Quote
Old 08-01-2007, 05:08 PM   #8
Newbie
 
Join Date: Jul 2007
Posts: 16
Default

Hardwood over concrete slab


The Jazdude mentioned 2 inch long fasteners- he's probably right. Screws may be the way to go but I have about 700sq. ft. to do, no fun. Maybe Krichton has the best idea with the fake grass. After all ,the NFL season is just around the corner... tomorrow I'm going to talk to a company that says they glue hardwood over slab with a special glue just for this purpose (imported from the USA ). Anybody have any experience with this method????
El Buey is offline   Reply With Quote
Old 08-01-2007, 09:30 PM   #9
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 3,950
Default

Hardwood over concrete slab


Sure, it's done all the time, but not for 3/4" solid hardwood. Solid hardwood has to be nailed every 8" more or less. You can use engineered hardwood which is glued to almost any subfloor. Engineered is made from several hardwood plies. The plies are laminated in alternating directions so that the board is more stable, and because it's any where from 3/8 to 1/2" thick, it has some flex too.

Forget the screw idea, that is not going to work at all. What does the manufacturer of your hardwood say? Oh...thenailer looks something like this;... http://www.airindustrialsales.com/im...ng%20tools.pdf

Jaz
JazMan is offline   Reply With Quote
Old 08-02-2007, 07:42 AM   #10
Newbie
 
Join Date: Jul 2007
Posts: 16
Default

Hardwood over concrete slab


Remember folks, I live in Costa Rica. We stopped wearing loincloths just a few years ago. Now, in order to find the manafacturer of the hardwood that we are going to use( Nispero or Corteza) I think I'd have to search for God. I can saythat the Nispero is 7/8" thick, 5" wide and a mix of lengths from 1' to 4', oven dried tongue and groove . The Corteza 5/8" thick and 3" wide. I want to see this special hardwood glue first and read the manafactures claims. At some point I WILL make a decision. Thanks for the airtool reference Jaz, I'll be surfing over to that site shortly. El Buey ( muy confundido )

El Buey 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
Extending Concrete Patio Slab bobo Building & Construction 6 04-17-2008 12:17 PM
Filling hole in carport (concrete slab) chaddihimself Building & Construction 2 08-10-2007 12:50 PM
Remodel over sloped concrete slab PSL_Hokie Building & Construction 11 07-11-2007 05:14 PM
Hardwood in kitchen over concrete slab Markvonjinn Flooring 12 05-09-2006 09:37 AM
Concrete slab weeps moisture dale h Flooring 2 04-30-2005 10:29 AM




Top of Page | View New Posts

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