Our house sits on a slab. Can solid oak still go down?

Not straight onto the concrete. Cost guides list solid hardwood for wood subfloors only, because of slab moisture. Engineered boards can be glued or floated on concrete, and solid can go over a dry slab once a vapor retarder and a plywood subfloor are in place. The testing side is on our Hardwood Floors Over Concrete page.

Which way should new boards run in a house with a crawlspace?

Across the floor joists, or on a diagonal, when there is a single layer of subfloor. That is the NWFA rule for solid strip and plank. If the boards have to run with the joists, NWFA calls for an extra layer of at least 1/2-inch plywood first, so ask the installer which way your rooms will run.

Can we stay in the house during the install?

Usually, with some planning. Fixr says a prefinished floor can be walked on right away, while a floor sanded and finished on site stays off-limits two or three more days. Fixr also suggests prefinished boards in an occupied home to limit exposure to finish fumes, so the board choice shapes the move-out question.

How long do the boxes need to sit inside before they go down?

Most manufacturers ask for at least 3 days of acclimation, with no maximum. NWFA wants the heating or air conditioning running at least 5 days before the install. Time alone isn't the test: the installer should meter the boards and subfloor and compare the readings before nailing.

Should new oak match the old floor in the hallway?

It can, if the species and strip width match. Most older oak floors are standard strip, 2 to 3 inches across. Unfinished boards sanded and finished together with the old floor blend best. Single boards and lace-ins are covered on our Hardwood Floor Repair page.

Hardwood Floor Installation in Torrance, CA

Hardwood Floor Installation Jobs, by Type

Most new floors come down to three questions: what the boards fasten to, whether they arrive finished, and what has to come up first.

First rows of unfinished oak strip flooring laid across a plywood subfloor in an empty room

Solid Strip and Plank Nailed Over Plywood

This is the classic solid floor: 3/4-inch tongue-and-groove boards blind-nailed through the tongue into a wood subfloor. In a house with a crawlspace, the subfloor and the space under it matter as much as the oak. NWFA guidelines set the basics:

Subfloor: 5/8-inch plywood or 23/32-inch OSB on joists 16 inches apart or closer
Direction: boards across the joists (or diagonal); running with them needs an added 1/2-inch plywood layer
Nailing for 3/4-inch strip: two fasteners per board 1 to 3 inches from the ends, then every 8 to 10 inches
End joints staggered at least 6 inches row to row for strip, 8 to 10 inches for 3- to 5-inch plank
Flatness: within 1/4 inch over 10 feet
Crawlspace: at least 18 inches to the joists, ground fully covered with 6-mil black poly

If the crawlspace floor is bare dirt, that last line is worth fixing before any wood arrives.

Prefinished oak planks with beveled edges running down a bright hallway

Prefinished or Site-Finished Boards

Prefinished boards come with the finish already cured on. Unfinished boards go down raw and get sanded, stained and coated in the room. Fixr finds the two end up close in price: about $2,200 to $4,000 for 300 square feet either way, labor included.

Prefinished: walkable the day it's installed; Fixr recommends it for remodels where the family stays home
Site-finished: 2 to 3 extra days before you walk on it; finish quality depends on the crew's skill
Finish choice: water-based, oil-modified or hardwax oil, with cure times on Hardwood Floor Finishes

Our take: if you're living in the house, prefinished saves a lot of hassle. If you're matching an old floor or want a custom stain, site-finished is the way to go.

Bedroom with the old floor pulled up and the bare subfloor showing, old boards stacked by the door

Replacing an Old Floor Room by Room

Fixr advises pulling the old floor out rather than covering it, since prepping an old floor to take new wood costs about as much as removing it. Once it's up, the installer checks the subfloor and screws down new 3/4-inch plywood where it's needed.

Old hardwood removal: $1 to $3 a square foot (Fixr); $1.50 to $3.50 for old flooring in general (HomeGuide)
Tear-out and haul-away: 1 to 2 days for a 300-square-foot room
Full subfloor replacement, if it fails: $2.20 to $4.75 a square foot

Old vinyl tile or black adhesive under the floor needs testing before anyone grinds it; see Hardwood Floor Removal. Carpet tear-out has its own page, Carpet to Hardwood.

Doorway where new unfinished oak strip meets an older oak floor before sanding

Matching New Rooms to Existing Oak

Adding a room or opening a wall usually means new oak running into old. Standard strip measures 2 to 3 inches wide, so finding matching stock is rarely the hard part. The hard part is getting the color right. Bring a loose board or a photo with a tape measure to the visit. Board-by-board weaving at the seam is covered on Hardwood Floor Repair.

Open boxes of oak flooring boards acclimating in an empty room, with a moisture meter resting on a board

Why Torrance homeowners call Torrance Wood Flooring

Free to call or use the form; the referral costs you nothing
Your request goes to one independent contractor, not a bidding list
Ask for a moisture reading and a written line-item estimate
California caps the down payment at 10% or $1,000, whichever is less

Hardwood Floor Installation Cost: Typical National Ranges

No California price table was found, so these are national guide figures, not a quote:

Item	Typical range	Guide
Hardwood, all types, installed	$9 to $25 per sq ft	HomeGuide
Hardwood, all types, installed	$14 to $32 per sq ft	Fixr
Solid hardwood, installed	$11 to $25 per sq ft	HomeGuide
Engineered, installed	$9 to $20 per sq ft	HomeGuide
Materials only	$6 to $15 per sq ft	HomeGuide
Labor only	$3 to $10 per sq ft (HomeGuide); $3 to $6 (Fixr)	both
1,000 sq ft, installed	$9,000 to $25,000	HomeGuide

Engineered planks have their own grades and methods on Engineered Hardwood Installation. Nail-down is the cheapest method and glue-down costs more.

Acclimation and Moisture Before the First Nail

Wood shrinks and swells with the air around it, so most failed floors trace back to moisture. NWFA's checks before installation are:

Heating or AC running at least 5 days before installation
About 40 boards metered for every 1,000 square feet
Strip under 3 inches
Within 4 percentage points of the subfloor's moisture; boards 3 inches and wider: within 2
Plywood or plank subfloor reading 12% moisture or under
Target
6 to 9% wood moisture, which comes with 30 to 50% indoor humidity at 60 to 80 F

Most manufacturers want at least 3 days of acclimation and set no upper limit. What the coast does to those numbers is on the homepage. Ask the installer to write the readings down. If gaps or cupping show up later, those records are what anyone checking the floor will compare against.