Exposed Glulam Delamination – Should Exposed Glulam be Sealed

Bryan Walford, Forest Research Institute, Rotorua

It can be assumed that stresses will develop along glue-lines in exposed glulam, simply because the grain orientation, ring orientation, wood density, response to moisture etc. thus will differ between adjacent laminations. European specifications for exposed glulam state that the growth rings in the laminations must all be oriented the same way, and they show a diagram of flat-sawn laminations all with the pith-side downwards. This is hardly practical in New Zealand with radiata as the ring orientation is likely to change across a finger-joint, and many laminations will be quarter-sawn, flat sawn and everything in between.
Issue 2 Vol 8.

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