See also: janka
In the United States, hardwood strip flooring is sold in face widths of 1½ inches, 2 inches, 2¼ inches, and 3¼ inches.
Flooring made of maple, beech, or birch is 25/32 inch thick. Each piece must be at least 2 feet long in First and Second grade flooring and at least 1¼ feet for Third grade.
There are also three special grades:
In the Second grade, minor imperfections such as small tight knots are permitted. Third grade flooring must provide a good, serviceable floor.
Oak or pecan flooring comes in thicknesses of 25/32 inch, ½ inch, and 3/8 inch. Pieces must be at least 2 feet long with a minimum average of 4½ feet in a shipment.
| Type | Grade | |
|---|---|---|
| Quartersawed
|
Clear | only defect allowed is 3/8 inch of bright sap |
| Select | some pinholes and small tight knots permitted | |
| Plainsawed
|
Clear | only defect allowed is 3/8 inch of bright sap |
| Select | some pinholes and small tight knots permitted | |
| No. 1 Common | makes a sound floor without cutting | |
| No. 2 Common | only required to provide a serviceable floor |
| home | | | materials index | | | search | | | your comments  | | | about | | | help | | |
Copyright © 2000 Sizes, Inc. All rights reserved.
Last revised: 28 December 2007.