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Flashcards in Wood Treatement Deck (17)
1

redwood: naturally occurring resins =

resistant to moisture/insects.

2

common sources of damage:

fungi when moisture,
insects/termites/marine borers,
fire.

3

preservatives: applied by

brushing/dipping/pressure treatment

4

most effective preservative applicaiton

pressure treating

5

distillate of coal tar.
protects against insects.

creosote

6

ex. protect railroad ties, marine timbers, roadway guard posts.
not used in building construction.

creosote

7

pentachlorophenol (aka penta) is an example of this type of preservative:

oil-borne

8

pentachlorophenol (aka penta) uses:

utility poles/
fresh water pilings/
bridge timbers.

9

pentachlorophenol (aka penta) typ. not used on building applications,
sometimes @

glulam long spans in arenas/pools.

10

most common preservatives in building.
protection against termites and decay.

waterborne preservatives:

11

advantages of this preservative: clean, odorless, non staining.
leave wood paintable.

waterborne preservatives:

12

examples of this preservative type:
ammoniacal copper quaternary (ACQ)
*aka alkaline copper quat.
copper azole,
sodium borate (SBX)

waterborne preservatives:

13

chromated copper arsenate (CCA)

waterborne preservative,
no longer used,
bc arsenic.

14

ACQ and copper azole,
more corrosive than CCA,
to:

fasteners/flashing (aluminum)

15

fasteners to spec for use w ACQ and copper azole.

304 or 316 stainless steel,
or hot-dip galvanized w min G90 coating.

16

problem w preservatives w borates:

leach when moisture.
use protected, not at ground.

17

treat w copper naphthenate solution, containing ≥2% copper, when:

when cuts made to treated wood