Manufactured Construction Products Flashcards
What are the benefits of utilizing an engineered wood core in hardwood plywood construction?
An engineered wood core typically costs less and is flatter than a softwood veneer core, but weighs more.
How is a sheet of plywood designed to minimize movement?
The grain direction and thickness of veneers is balanced across the thickness of the plywood.
How are softwood veneers typically cut for the production of plywood?
Softwood veneers are typically ROTARY CUT.
How are hardwood veneers typically cut for the production of plywood?
Hardwood veneers are typically ROTARY CUT and PLAIN SLICED.
What is plywood?
Plywood is an engineered panel built with sheets of veneer glued together with an adhesive.
Whys is MSG core material used to make panelling with veneers?
It’s stable, flat, smooth and no telegraphing of the grain.
How do the expansion characteristics of plywood (along the face grain and across the face grain) compare to the expansion characteristics of solid wood?
Expansion in plywood of balanced construction is slightly GREATER ALONG the grain, but much LESS ACROSS the grain than solid wood.
Glued together planks and boards must be _____ mm or less in thickness.
50 mm. It is not commercially possible to dry those if greater thickness.
____ _____ is used to adhere veneers for plywood.
Phenolic resin
For exterior plywood, the veneer is bonded together with waterproof glue and is used where moisture content is expected to be higher than ___%.
20 %
Plywood weights up to ___% less than substitute wood-based panels of equivalent thickness.
40%
Dimensional change in plywood is approximately the same in both directions. T or F
T
For best performance, ____ glue should be applied between plywood and supports before fastening with nails or screws.
Elastomeric
Joints in underlayment should be staggered and offset at least ___ mm from joints in sub flooring and with edges butted to light contact.
200 mm 8”
Underlayment should be layed at ____ angles to subfloor.
Right
