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pressure-treating glu-lams

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APA has a publication on their website entitled Preservative Treatment of
Glued Laminated Timber:

It basically states that treating with Creosote or Pentachloraphenol in oil
would require treating the glulam after fabrication. Treating with Penta in
light hydrocarbon solvents or with waterborne salts would allow treatment of
the laminations prior to manufacture. However, not all manufacturers can do
this, so it needs to be verified ahead of time.

AITC also has a publication entitled Designing Structural Glued Laminated
Timber for Permanence. Here's a link to it on their website shopping cart:


Buddy Showalter, P.E.

Subject: pressure-treating glu-lams
From: "Michael Livingston" <mlivingston(--nospam--at)>
To: "SEAINT (E-mail)" <seaint(--nospam--at)>

A fellow engineer in my office asked me about pressure-treating glulams
for exterior exposure.  I don't know the specifics of her project, but
she was told that each lamination needed to be individually
pressure-treated prior to fabrication instead of just the exterior of
the finished beam getting the treatment.  Is this true?  Is it due to a
limitation of the pressure-treating equipment or are the joints
susceptible to decay?
Mike Livingston

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