Bur Oak vs. White Oak: Wood Selection for Epoxy Tables

Bur Oak vs. White Oak for Epoxy Tabletops

Choosing between Bur oak (Quercus macrocarpa) and White oak (Quercus alba) for an epoxy river table or solid wood tabletop requires looking closely at how each timber behaves under load, moisture changes, and daily use. Both species belong to the broad white oak group, yet their mechanical and physical characteristics differ in ways that directly influence slab stability, joint stress, and structural design.

All performance figures referenced below are documented by the USDA Forest Products Laboratory in the Wood Handbook (FPL-GTR-282, 2021).

Figures from the USDA Wood Handbook (FPL-GTR-282), Tables 4-1, 4-3, 5-3b, 13-5 and 14-1. Clear, straight-grained specimens; real slabs vary.

Property	Bur oak	White oak
Specific gravity (12% MC)	0.64	0.68
Side hardness, lbf (12% MC)	1,370	1,360
Modulus of rupture, lbf/in² (12% MC)	10,300	15,200
Modulus of elasticity, million lbf/in² (12% MC)	1.03	1.78
Compression perpendicular to grain, lbf/in² (12% MC)	1,200	1,070
Radial shrinkage, green to ovendry (%)	4.4	5.6
Tangential shrinkage, green to ovendry (%)	8.8	10.5
Volumetric shrinkage, green to ovendry (%)	12.7	16.3
Dimensional change coefficient, tangential (per 1% MC)	0.00312	0.00376
Dimensional change coefficient, radial (per 1% MC)	0.00151	0.00194
Green MC of heartwood (%)	—	64
Tangential/radial shrinkage ratio (calculated)	2.0	1.9
Heartwood decay resistance (Table 14-1)	Resistant	Resistant

Weight and Dent Resistance

Specific gravity at 12% moisture content reflects the basic density and expected weight of a cured tabletop. Bur oak has a specific gravity of 0.64, while White oak measures slightly denser at 0.68. For a large dining slab, White oak will yield a marginally heavier build, though both provide a substantial, solid feel.

Dent resistance depends on side hardness and compression perpendicular to the grain:

• Side hardness: At 12% moisture content, Bur oak rates at 1,370 lbf, whereas White oak tests at 1,360 lbf. In terms of resisting everyday surface dings and dropped utensils, both perform essentially the same. In green condition, Bur oak measures 1,110 lbf and White oak measures 1,060 lbf.
• Compression perpendicular to grain: This metric governs how well the wood resists crushing beneath heavy bases, steel trestle plates, or direct clamping. Bur oak reaches 1,200 lbf/in² at 12% moisture content (680 lbf/in² green). White oak reaches 1,070 lbf/in² at 12% moisture content (670 lbf/in² green). Bur oak offers higher resistance against localized crushing under mechanical fasteners or table leg mounting plates.

Stiffness and Strength for Overhangs and Spans

When engineering tables with extended overhangs, unsupported spans, or thin profiles, stiffness and bending strength become critical:

• Modulus of elasticity (MOE): White oak exhibits an MOE of 1.78 million lbf/in² at 12% moisture content (1.25 million lbf/in² green). Bur oak tests at 1.03 million lbf/in² at 12% moisture content (0.88 million lbf/in² green). White oak is significantly stiffer, deflecting far less under heavy spans or cantilevered end seating.
• Modulus of rupture (MOR): The bending strength of White oak reaches 15,200 lbf/in² at 12% moisture content (8,300 lbf/in² green), compared to Bur oak at 10,300 lbf/in² (7,200 lbf/in² green). White oak can tolerate substantially higher bending forces before failure.
• Parallel shear strength: White oak provides a shear strength parallel to the grain of 2,000 lbf/in² at 12% moisture content (1,250 lbf/in² green), while Bur oak reaches 1,820 lbf/in² (1,350 lbf/in² green).

Seasonal Movement and Shrinkage

Epoxy does not shrink or expand with relative humidity, while wood naturally moves across its grain. Managing shear stress along the wood-to-epoxy bondline requires examining shrinkage and dimensional change coefficients.

Green to ovendry shrinkage values show distinct behavior:

• Bur oak: Radial shrinkage is 4.4%, tangential shrinkage is 8.8%, and volumetric shrinkage is 12.7%. Its calculated tangential-to-radial (T/R) shrinkage ratio is 2.0.
• White oak: Radial shrinkage is 5.6%, tangential shrinkage is 10.5%, and volumetric shrinkage is 16.3%. Its calculated T/R ratio is 1.9.

Bur oak exhibits lower total volumetric, radial, and tangential shrinkage. Its dimensional change coefficients are 0.00151 (radial) and 0.00312 (tangential) per 1% change in moisture content. White oak moves more with each percentage point of moisture change, with coefficients of 0.00194 (radial) and 0.00376 (tangential). Lower movement values in Bur oak reduce the seasonal stress imposed on the epoxy bondline in fluctuating interior climates.

Regarding green moisture content, USDA data lists White oak at 64% in heartwood and 78% in sapwood (data is not listed for Bur oak). Both woods must be dried thoroughly to equilibrium before resin work begins; always follow the resin maker’s data sheet for surface preparation and pour parameters.

Heartwood Decay Resistance

According to Table 14-1 of the USDA Wood Handbook, the heartwood of both Bur oak and White oak is rated Resistant to decay. While interior tables rarely face prolonged rot hazards, this natural resistance protects against localized moisture exposure.

Which to Pick When

• Choose Bur oak if seasonal stability across the width of the slab is your priority. With lower tangential shrinkage (8.8% vs. 10.5%) and lower dimensional change coefficients, it exerts less cross-grain movement against the resin interface. It also provides higher compression perpendicular to the grain (1,200 lbf/in²).
• Choose White oak if your design features long unsupported spans, large seating overhangs, or narrower slab thicknesses where high stiffness is essential. With an MOE of 1.78 million lbf/in² and an MOR of 15,200 lbf/in², it resists sagging far better over broad spans.

Sources

• USDA Forest Products Laboratory, Wood Handbook (FPL-GTR-282, 2021)

Published October 28, 2026. Sources are linked in the text.

Header image: original graphic by BigEpoxy.com.