Wood Materials
Pressure Treated
Introduction
Retention Levels
Species & Sizes of Pressure Treated Wood
Grading Standards
Cedar
Introduction
Uses
Types of Cedar
Grading
Fasteners
Redwood
Wood Properties
Trees and Environment
Uses
Grades
Larch
Properties
Tree
Environment
Uses
Grades
Siberian Larch
Cypress
Properties
Tree
History
Uses for Cypress
Types and Grades



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Pressure Treated Wood

Wood can be impregnated with a variety of preservative chemicals to prevent rot and insect infestation in exterior applications like decks. Several species of wood can be treated, but a regionally available species usually predominates in any particular locale.  Pressure treated lumber is ideal for outdoor construction as it has a long, useful life span and is much less expensive than alternatives. Treated wood can last more than 40 years. The treatment process involves placing a load of lumber in a huge cylindrical chamber called a retort with a door on one end that can be sealed airtight and then forcing waterborne chemicals into the wood under pressure.
 
 

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