I was talking to the contractor that is going to be installing my second layer and he told me about the new USG lightweight gypsum. After doing to some research, it looks like some of the larger home improvement centers will be discontinuing the standard heavy gypsum/drywall soon. I checked with Home Depot and Lowe's (which is mostly who is around this area). Other lumber yards may be different, but I thought that I would post.
One type is made by USG
http://www.gypsumtoday.com/news/viewnews.pl/id=1873
My contractor told me that the product rep was telling him how much better this new stuff is :blah: and that though it was lighter (about 20 lbs/sheet), it was just as dense. :shock: Yeah... I told my contractor not to count on using the lighter stuff, I don't care how much lighter and easier it is to work with.
Scott
standard density gypsum less available soon ?
Originally posted at johnlsayers.com, topic 17165.
which is why we talk about fire-rated wall board....not typical residential wall board.
The fire rated is more dense, more consistent in mass, more cost, and more heavy, has more data that supports the use of it,,,,heck it is just more, and THAT is the way to go :)
That's just the issue, they are selling this as fire rated gypsum. Take a look at the link.
"This product is the industry's first lightweight UL Classified product for fire-rated partitions. The 5/8-inch panel is designed to be used for all fire-rated assemblies where type X board is required. "
Scott
How can it be the same thickness, the same density, and also lighter? :shock: That doesn't make any sense at all. But anyway, that new stuff won't be much good for isolation if it is 20 pounds per sheet lighter! Not good. We'll have to be extra careful when ordering drywall in future, to make sure it is NOT the lightweight stuff. - Stuart -...that though it was lighter (about 20 lbs/sheet), it was just as dense....
I agree. :thu: I actually told my contractor that the rep was either misinformed, lying or simply unaware of the simplest of physics. In any case, that's why I posted, to let people know of this new product so that they will be careful to get the right stuff, especially if they are ordering large quantities for delivery. Scott]How can it be the same thickness, the same density, and also lighter? :shock: That doesn't make any sense at all. But anyway, that new stuff won't be much good for isolation if it is 20 pounds per sheet lighter! Not good. We'll have to be extra careful when ordering drywall in future, to make sure it is NOT the lightweight stuff. - Stuart -
Jesus christ, every time I turn around you guys are having me read something :) As the industry phases out products, like this one, that is integral to the mass we look for, it is only hopeful that we can relie on the same industry to outline the products in whatever configuration that will be used to replace these, from a data driven point of view. We use light weight rock in our jobs (not specifically acoustic in nature) but there are still noise ordinances and sound levels that have to be maintained from one residence to another and especially from one apartment to another, that number being 50 on the STC scale. Now if this product can still maintain a 50 point on the STC, and I have no doubt it can, we still are left to wonder about the mass infringement on our neighbors with our low frequency that can and will penetrate these panels. Assuming that the construction techniques do not change, then there has to be another added element to help contain the low frequency from one side to the other. pictures at Eleven...That's just the issue, they are selling this as fire rated gypsum. Take a look at the link.