Definition of Cross Lamination Timber (CLT)
Cross Laminated Timber (CLT) has been around for quite some time. Initially developed in Europe as an alternative to stone, masonry, and concrete construction, CLT is essentially mass timber plates made from smaller framing lumber laminated crosswise on their wide faces. It is known for its strength, appearance versatility and sustainability.
CLT construction allows for wood frame construction up to ten (10) stories high. It is rapidly gaining in popularity in the U.S. One of the major challenges from CLT is noise control. Since the floor panel, also acts as the ceiling, there are no opportunities for the mass spring mass of effective sound control. Both STC and IIC ratings are a big challenge, often making it difficult to achieve Building Code minimum standard of 50. Even when 3/4" sound mat is used in combination with 2 inches of gypsum cement the 50 STC and IIC code minimum, cannot be achieved.
Here at Keene Building Products and Dependable we have recently done some preliminary testing with a combination double layer sound mat utilizing our Quiet Qurl® entangled net, with our patented MT (Muffling Technology) and Step Soft™ recycled rubber, were we have achieved some extremely encouraging results. When also utilizing a double pour, in conjunction with our sound mats, we were able to achieve even greater results. We have published these results in our most recent upgrade to our Acoustic Product Guide:
The combination of the MT fabric in conjunction with the more solid mass of the recycled Step Soft and Quiet Qurl entangled net sound mats provide the mass spring mass necessary for sound attenuation in the CLT panels. Only Keene and Dependable can create a one stop shop manufacturer of these products to produce these results and unique noise control solution for CLT construction.
For more testing information check out our sound and UL Guide: http://www.keenebuilding.com/KeeneBuilding/media/KeeneBuilding/Resources/Sound-and-UL-Guide.pdf
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