Subfloor Thickness w/ 3/4' Hardwood (white Oak)

toddimtJune 27, 2011

I am planning on getting 5" Quartersawn 3/4" thick hardwood flooring installed in my home.

The subfloor in the house is currently 1/2" Plywood Sheets. I though I read that 5/8" or 3/4" plywood subfloor was recommended for hardwood. If that is the case I could add another layer as underlayment. Obviously want to keep the height to a min so not sure if 1/4" or 1/2" would be suitable.

Also, I can either add more nails or screw down the existing 1/2" subfloor to the joists. Is screwing preferred over the spiral flooring nails? Want to make sure the floor is as solid and sound as possible.

Thank you for reporting this comment. Undo

Either fastening method is fine. If you screw it down use construction screws NOT drywall screws.

Although 5/8" or 3/4" is preferred as a subfloor, I have seen many hardwood floors that went over 1/2" plywood that are just fine. I doubt that a 1/4" overlay is going to do much of anything for you, except maybe prevent the fasteners from blowing though the 1/2" subfloor. Is this a new house? And...or...what is the joist spacing and do you have any sag 'between' the joists?

    Bookmark   June 27, 2011 at 9:47PM
Thank you for reporting this comment. Undo

Some of the old timers used to lay out chalk lines on the paper over the joists and nail into the joists as well as in between. This allows the 2" cleats extra holding power.

    Bookmark   July 1, 2011 at 4:01PM
Thank you for reporting this comment. Undo

Nailed down flooring sub-floor thickness is mostly to make sure there is adequate holding power in the nails.

Screws are not nearly as much of a problem, but screwed and plugged can lead to splits form drying of the wood between the screws since there will be very little movement of the screws.

Nailed down T&G flooring is only actually fastened on one edge to allow for movement on the otter edge.

    Bookmark   July 3, 2011 at 4:47PM
Sign Up to comment
More Discussions
Anyone used Coretec?
I have searched and searched, but I haven't seen any...
Brazilian Cherry with infloor heat, rug or no rug
We just got our in floor heat installed in the sunroom. Hoping...
What to use on edging and stairs when stripping of old hardwood floor
We are in the process of stripping and refinishing...
Any experience with BellaCera hardwood flooring and/or hickory wood?
We fell in love with a hickory hardwood in their line,...
Where can I find some replacement Haddon Hall parquet tiles?
I've been searching the Internets for a particular...
Sponsored Products
Globo Globe Lamp by Viso
$230.00 | Lumens
Leyna Basin - No Faucet Holes - White
Signature Hardware
European Sham - WHITE
$77.90 | Horchow
Altea 3-light Curved Nickel Semi Flush Chandelier
Goldenrod Ovo Table Lamp
$99.99 | Lamps Plus
Richard Schultz | Quick Ship: Cover for 1966 Collection® Lounge Chair with Arms
Aging Eye Mini Table Lamp
Area Rug: Cantaura Stormy Sea 3' 6" x 5' 6" Flatweave
Home Depot
© 2015 Houzz Inc. Houzz® The new way to design your home™