Partially Treated Glulam Beams
When you are in a situation where part of your beam will be exposed outside or to a humid environment, and the other part will not, we are able to feather treated glulam into untreated material.
Here is a close-up of some beams where we did just that.
And, this is an example of a large arch glued using treated and untreated material.
This process saves some cost, as treated lumber is more expensive than untreated.