03:42PM | 05/30/04
Member Since: 07/18/03
7 lifetime posts

My husband is going to put down Rosewood Hardwood on our bedroom and dressing room floors. When he pulled up the carpet, etc., he found that the existing subflooring is only 1/4" thick. (As is the entire downstairs)

Should he replace the subflooring with 1/2" or will it be fine as is?

We have had a lot of issues with floors, such as the kitchen floor tiles (from Spain - not mexico, they are the thinner ones and there are blue delft tiles inset at each "corner") these tiles have had a problem with cracking and lifting up. My husband thinks the thin subflooring does not provide a steady support for the floors in the house.

Any advice is very much appreciated!



09:17AM | 06/02/04
Member Since: 08/27/03
255 lifetime posts
1/4 subfloor? Are you sure it's not 1/4 underlay on 3/4 subfloor?


03:36PM | 06/02/04
Member Since: 03/05/04
3 lifetime posts

No, My husband thought it was 1/4 inch but he measured it and it turns out to be 1/2 board. There is no other flooring beneath that. There are many places, particularly between joists that feel flexible. Should we be concerned with that or will the 3/4 Hardwood nullify the flexibility?

We have read on many sites that the sub floor should be fixed if the floor is not flat.

How do you go about fixing a sub floor that seems to dip every other joist, has several locations that sink when walking over them, usually at the edge of a board between joists?

We have not seen any sites that deal with severe ridges. Other than replacing the 1/2 board with 3/4 what can be done?


09:22AM | 06/03/04
Member Since: 08/27/03
255 lifetime posts
I know little about joist work, but I would replace with 3/4 tounge and groove plywood and nail the 3/4 wood to that.....should be a stable floor for sure after that.


09:38AM | 06/03/04
Member Since: 07/01/03
558 lifetime posts
Your subfloors are inadequate and should be 3/4 inch minimum thickness T&G plywood or OSB. If you do not replace subfloors, the hardwood flooring in your case will reduce floor deflections if the flooring is installed perpendicular to floor joists. Any manufacturer warranty will be void for this install due to non-conformance of the subfloor.

New subfloor can be installed in place of or on top of the existing 1/2 inch floor, glued and nail to joists or at joist if installed over existing. You will need to trim doors, raise base moldings and make other adjustments as your total floor thickness will increase 1-1/2 inches with the subfloor and finish floor. The cracking tiles in the kitchen are also a result of excess deflection.

What is the spacing, span and size on your floor joists? Are they also undersize?


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