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"The fight is never about grapes or lettuce. It is always about people." Cesar Chavez |
:: Wednesday, May 14, 2008 ::
Caution needed when using pressure-treated wood - By Steve Maxwell, Ottawa Citizen, Canada
Besides rules for safe handling of pressure-treated lumber, there's a structural issue, and it has to do with a chemical interaction that's not obvious.
A substance called alkaline copper quat (ACQ) is one of the most common wood preservative compounds that keeps new kinds of pressure-treated lumber from rotting.
ACQ relies on copper to be effective, not arsenic, and this is where structural problems can occur if you're not careful. When the copper in pressure-treated wood gets wet and comes in contact with certain kinds of metal nails, screws and joist hangers, it accelerates the corrosion of these fasteners.
The first signs of trouble show up as rapid staining of the wood surrounding these fasteners, often within just a few weeks of construction. And within a few years, the choice of inappropriate fasteners will cause premature deck failure as nails and screws are reduced to crumbly iron oxide.------------------------------------------- posted 6:15 AM :: reference link ::
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