American white oak

American white oak is the timber of a group of North American oaks, principally Quercus alba. The Wood Database lists it at 1,350 lbf (5,990 N) on the Janka scale and 755 kg/m³ average dried weight¹, a medium-hard, fairly heavy floor timber. The National Wood Flooring Association names white oak and red oak as the dominant species in U.S. hardwood forests and so the majority of solid hardwood flooring production⁷.

What is American white oak?

AHEC gives the Latin name as Quercus species, principally Quercus alba, and lists northern white oak and southern white oak as other names⁵. The USDA Wood Handbook names white (Q. alba), chestnut (Q. montana), post, overcup, swamp chestnut, bur, chinkapin and swamp white oak as the principal species of the group, with lumber coming chiefly from the South, South Atlantic and Central States⁴. The Wood Database gives the distribution as the eastern United States, with trees 65 to 85 ft (20 to 25 m) tall¹.

What does white oak look like?

The Wood Database describes the heartwood as light to medium brown, often with an olive cast, and the sapwood as paler and not always sharply separated. The grain is straight with a coarse, uneven texture, and quarter-sawn boards show prominent ray fleck¹. The Wood Handbook describes nearly white sapwood about 2 to 5 cm (1 to 2 in.) wide and generally greyish-brown heartwood⁴. AHEC reports light-to-dark brown heartwood, a sap and heart contrast less distinct than in red oak, and rays longer than those of red oak, which gives a more pronounced figure⁵. Colour therefore varies by log, and AHEC adds that white oak may be sold as northern or southern but that this may oversimplify differences according to growing location⁵.

How hard and dense is white oak?

Three published figures sit close together:

The Handbook defines hardness as resistance to indentation measured with a modified Janka test, in which an 11.28 mm ball is pressed to half its diameter into the wood⁴. For comparison, The Wood Database lists red oak at 1,220 lbf² and English oak at 1,120 lbf³. Our guide to Janka hardness explains why differences of this size rarely decide a purchase.

How much does American white oak move?

The Wood Handbook gives green-to-ovendry shrinkage of 5.6 % radially, 10.5 % tangentially and 16.3 % volumetrically⁴. The Wood Database adds a tangential-to-radial ratio of 1.9 and says the high shrinkage gives mediocre dimensional stability, especially in flat-sawn boards¹. AHEC states the wood must be dried slowly and carefully, and that its high differential radial and tangential shrinkage can make it susceptible to movement in humid conditions⁵.

Because wood shrinks about twice as much tangentially as radially, the Handbook advises estimating width change with tangential values for plain-sawn boards and radial values for quarter-sawn boards⁴. NWFA/NOFMA defines quarter-sawn flooring by a ring angle of 45 to 90 degrees to the face and ray fleck wider than 1/16 in. (1.59 mm), and requires at least 50 % of a piece to show those characteristics to be sold as quarter-sawn⁶. Allow for seasonal change by following the guidance in moisture and acclimatisation.

Why do tyloses matter?

The Wood Handbook notes that white oak heartwood pores are usually plugged with tyloses, which tend to make the wood impenetrable to liquids, so most white oaks suit tight cooperage⁴. The Wood Database describes tyloses as abundant in the large earlywood pores of the heartwood and notes that red oak lacks them¹. AHEC describes the heartwood as not porous, and resistant to decay⁵. For floors this affects how liquids and some finishes behave at the surface, and it is one of the practical differences from American red oak, whose open pores the Handbook links to unsuitability for tight cooperage⁴.

How does white oak take stain, finish and fuming?

The Wood Database says white oak glues, stains and finishes well, and warns that it can react with iron, especially when wet, causing staining¹. AHEC adds that it can be stained and polished to a very good finish⁵. Our guide to wood floor finishes compares oils, lacquers and hardwax oils.

Ammonia fuming darkens oak through reactions with its tannins. A peer-reviewed study tested Quercus robur rather than white oak, and found oak reacted intensively with ammonia gas⁸. The same paper's introduction reports that fuming has historically produced a warm brown and accentuated the ray fleck most notable in quarter-sawn white oak⁸.

How is it used in flooring?

The Wood Handbook lists flooring among the uses of white oak, alongside furniture, doors, millwork, cooperage and boat building⁴. AHEC lists furniture, flooring, doors, architectural joinery, mouldings and kitchen cabinets as the main uses⁵. The NWFA/NOFMA standard grades oak flooring as Clear, Select, No. 1 Common and No. 2 Common, and states that appearance alone determines grade, since all grades are equally strong and serviceable⁶. The same document sets the standard thickness of unfinished solid flooring at 0.750 in. (19.05 mm), with a tolerance of 0.015 in.⁶. See solid wood flooring for how boards are made and installed.

Is American white oak sustainable?

AHEC's forest inventory figures show U.S. white oak growing stock of 2.26 billion m³ (15.5 % of total U.S. hardwood growing stock), annual growth of 40.1 million m³ against a harvest of 20.1 million m³, and growth exceeding harvest in all major supplying states⁵. AHEC is a trade body promoting American hardwood, so these are industry-reported figures drawn from U.S. Forest Service inventory data. The Wood Database lists white oak as least concern on the IUCN Red List and unlisted under CITES¹.

Oak flooring is also sold by appearance grade, such as Clear, Select and No. 1 Common; see wood flooring grades for what those terms mean.

This page compiles published data from the sources listed above. Read our editorial policy. Last updated 3 Nov 2026.