Wood Strength (Modulus of Rupture) Ratings for Wood Flooring

The modulus of rupture is a measure of the maximum load carrying capacity of a given species in bending strength and is proportional to the breaking point or maximum strength as borne by the specimen.

Massaranduba, Brazilian Redwood 29,200 psi
Ipe, Brazilian Walnut 25,400 psi
Cumaru, Brazilian Teak 24,800 psi
Purpleheart 21,300 psi
Merbau 20,700 psi
Muiracatiara, TigerWood 20,120 psi
White Oak 15,200 psi
Red Oak 14,300 psi
Douglas Fir 12,400 psi
Genuine Mahogany 11,460 psi

The Wood Handbook — Wood as an Engineering Material, USDA, General Technical Report 113.