Wood Subfloor With Slab Room Addition - Flooring - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 02-14-2009, 01:46 PM   #1
Newbie
 
Join Date: Feb 2009
Posts: 2
Rewards Points: 10
Default

Wood subfloor with slab room addition


Had a room addition added to my raised foundation house. As you can guess the slab is off by 1/8 inch lower where the two floors meet to form one large room. It actually starts off on the same plain then slowly drops down 1/8 inch over a four foot distance. This my sound picky, but every time I walk over this it bothers me. I have used floor lever liquid before, but the surface tension of the liquid is higher than the problem. I will be putting Lazon engineered flooring over the hole room. Better Ideas?

Paul

Advertisement

pfrech is offline   Reply With Quote
Old 02-14-2009, 02:16 PM   #2
Member
 
Join Date: Dec 2008
Posts: 104
Rewards Points: 75
Default

Wood subfloor with slab room addition


Floor patch on the lower concrete side should get things levelled out.

But...

The wood floor is more prone to expansion and contraction due to changes in temperature and humidity than the concrete floor. The two subfloors will move relative to one another at the joint.

Also, how were you planning to attach the planks? You're probably going to glue on the concrete unless the floor can be floated. Better to nail or staple on a wooden subfloor unless it can be floated. Awful hard to mix and match mid-job.

I'd float the wood floor over foam, glueing the tongues and grooves, strapping and clamping while it sets. That should also minimize issues where the two subfloors meet. If the wood you selected can't be floated, select one that can be...

Advertisement

Mudd is offline   Reply With Quote
Old 01-08-2010, 10:49 PM   #3
Newbie
 
Join Date: Feb 2009
Posts: 2
Rewards Points: 10
Default

Wood subfloor with slab room addition


Realized that the job was to big for me. Hired a pro to do the install. He put down 1/2 inch plywood over the concrete and the raised foundation subfloor ( nailed and glued over both after "felt paper"). He glued the floor down over both surfaces.

The new engineered floor is not flat. I did not expect a level floor; I doubt any floor in a fifty year old house is. I have a six foot level that rocks 3/8 of an inch in many places of this 1500 sq install. Is this the industry standard? Some places sound empty when you walk on them; is this normal?

Paul
pfrech is offline   Reply With Quote
Reply


Thread Tools
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
Floating Wood Sub-Floor over slab? Stargazer Building & Construction 8 11-25-2007 08:41 AM
Radiant Heating on Cement Slab can'tdecide Flooring 2 08-21-2007 01:59 PM
Home Addition cost? Russ Chewning Building & Construction 3 10-23-2006 08:59 PM
Load calcs for room addition Jim Tyson HVAC 1 02-23-2006 06:36 PM




Top of Page | View New Posts