WEBVTT - How does pressure-treated lumber work?

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<v Speaker 1>Welcome to Brainstuff from how Stuff works dot com where

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<v Speaker 1>smart happens. Hi, I'm Marshall Brain with today's question, how

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<v Speaker 1>does pressure traded lumber work? Wood is a great building material.

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<v Speaker 1>It's strong, lightweight, easily worked with tools, and relatively inexpensive.

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<v Speaker 1>The only problem with wood is that many varieties of bacteria, fungi,

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<v Speaker 1>and insects find it appetizing. When wood is in contact

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<v Speaker 1>with the ground or moisture for any period of time,

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<v Speaker 1>these organisms attack the wood. Untreated wood, like pine, will

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<v Speaker 1>only last a year or two if it's touching hot ground.

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<v Speaker 1>Pressure treated lumber is wood that's been immersed in a

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<v Speaker 1>liquid preservative and placed in a pressure chamber. The chamber

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<v Speaker 1>forces the chemical into the wood fibers. The pressurized approach

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<v Speaker 1>makes sure that the chemical makes it to the core

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<v Speaker 1>of each piece of wood. It's much more effective than

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<v Speaker 1>simply soaking the wood in the chemical. The most common

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<v Speaker 1>chemical used to treat lumber used to be chromated copper

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<v Speaker 1>arsenate or c C A. In two thousand three, however,

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<v Speaker 1>the Environmental Protection Agency restricted the use of c c

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<v Speaker 1>A in residential settings due to health and environmental concerns

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<v Speaker 1>about the arsenic leaching out of the wood. The most

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<v Speaker 1>widely used alternative to c c A is alkalin copper

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<v Speaker 1>quat or a CQ. Copper is toxic to most insects

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<v Speaker 1>and fungi that might cause de k. A c Q

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<v Speaker 1>binds the wood fibers very well, and it allows the

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<v Speaker 1>wood to last decades even when it's in contact with

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<v Speaker 1>the ground. The protection provided by the chemical depends on

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<v Speaker 1>the amount of chemical that the wood absorbs. In the

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<v Speaker 1>United States, the amount of chemical is measured in pounds

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<v Speaker 1>of chemical per cubic foot of wood. For ground contact,

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<v Speaker 1>point four pounds per cubic foot is needed. For above ground,

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<v Speaker 1>point two pounds per cubic foot is the standard. The

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<v Speaker 1>chemicals and treated wood are generally not very good for

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<v Speaker 1>humans either. I mean, if it's gonna kill bugs, it's

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<v Speaker 1>probably not good for us. This is why you see

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<v Speaker 1>warnings advising you to wear gloves, avoid breathing the sawdust

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<v Speaker 1>and refrain from burning treated wood. Keeping small children away

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<v Speaker 1>from treated wood is also a great idea for moral

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