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Frequently Asked Questions

Treating Glulam Timbers with Waterborne Preservatives

How will pressure-treatment with waterborne chemicals after bonding affect the appearance of glulam?

If glued laminated timbers are treated after bonding, dimensional changes caused by saturation of the wood with the water borne preservatives and their carrier followed by subsequent re drying may result in raised grain and warping, checking, or splitting. Examples of typical appearance are shown below.

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Checking on glulam beam treated with ACQ after bonding:


Raised grain, shelling, and checking in glulam beam treated with CCA after bonding:

 

 
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