Solid Wood Products 



2655 



THREE-PLY VENEER CORE CONSTRUCTION 



CR08S8AND8 



FIVE-PLY VENEER CORE CONSTRUCTION 



MULTIPLY VENEER CORE CONSTRUCTION 



FIVE-PLY PARTICLEBOARD CORE CONSTRUCTION 



.BACK 

 BANDS OR RAILS 



CORE (LUMBER. PARTICLEBOARD. 

 OR HARDBOARDI 



FIVE-PLY LUMBER CORE CONSTRUCTION 



FIVE-PLY 

 CONSTRUCTION WITH BANDING OR RAILING 



Figure 22-47. — Typical hardwood plywood constructions. (Drawing after U.S. Depart- 

 ment of Commerce 1972.) 



plywood glue bonds are intermediate and must withstand a three-cycle soak test. 

 Type III plywood specimens need only withstand a two-cycle soak test. 



Block flooring. — Laminated hardwood block flooring standard ANSI 010.2 

 dated 1975 (American National Standards Institute, Inc. 1975) establishes the 

 specifications for this product which is commonly available in oak sp. (fig. 22- 

 49) and ash — as well as other eastern hardwood species such as pecan, hard 

 maple, birch, beech, walnut, and cherry. Conventional dimensions of flooring 

 blocks are 9 by 9 inches square and 15/32-inch thick. Blocks are glue-laminated 

 from three, four, or five plies of veneer; the grain of each ply is at right angles to 

 the grain of adjacent plies, except in four-ply blocks in which the grain of the two 

 center plies run in the same direction. In three-ply and four-ply construction, the 

 face ply is at least 0.100-inch-thick after sanding; in five-ply construction, the 

 face ply after sanding must measure at least 0.080 inch thick. Unfinished 



