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The RDG section 5.4.1.7 MGS,
states that Wood Blocks are used and testing documents I have read
state "White Pine". 

Are composite blocks allowed
to be used with the standard MGS system?

Regarding the 25 feet span
that required 12 inch blocks, would composite blocks appropriate as
well?

Thank you for your time,

We have largely tested the MGS with 12-in. SYP wood blocks. We have conducted some testing with 12-in. WP wood blocks as well. I do not believe that we have used recycled blocks in our tests but may have conducted component tests on recycled blocks that may be applicable. I somewhat recall that E-Tech Testing Services conducted testing on a recycled MGS blockout several years ago. I will ask my colleagues whether 12-in. blocks have been fabricated and tested with the MGS. The MGS was only tested with wood blocks thus far. Without testing, I am uncertain about using a different blockout with the 3 CRTs on each side of the long span and believe that testing may potentially need to be performed.