Worried about the safety of cross-laminated timbers (CLTs)? A new Youtube video from a coalition of the National Ready-Mixed Concrete Association warns that using anything other than its product for a building is "playing with fire", reports Prosales editor-in-chief Craig Webb.

The video expresses concern about CLTs, and emphasizes the importance of resilient building materials in the Seattle area. The video has text with statements such as "if you're not building with ready mixed concrete, you're playing with fire," "with concrete there's only peace of mind," and "there's a new threat to fire safety...wooden high-rise."

"There’s no substitute for building with strength, and in the case of homes for families, the potential for disaster with Cross-Laminated Timber is simply too great at this time," Build With Strength's YouTube page says.

According to a web page for Seattle's Department of Construction and Inspections, the city is deciding whether to revise Seattle Building Code's to permit buildings made of wood products that are higher than the current limit of six stories or 85 feet. Advocates of CLTs have been pushing worldwide to alter construction limits for wood. One of the centers for this movement is just north of Seattle in Vancouver, Canada.

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