Just some thoughts on newer construction and size up. In watching buildings being constructed lately, I've noticed that the final product looks nothing like what is under the skin. It's not only trusses that are of concern. There are metal channel studs, foam filled pannels, laminated beams, brick faced facades, hurricane glass windows, etc. All of these components react differently to fire than their "traditional" counterparts. The question is, are we endangering ourselves by giving "traditional" size ups to buildings where we really don't know what is under the skin? Is a "woodframe residential" really a type V building anymore? How can we account for these new construction techniques and materials in our size up?
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