![]() ![]() ![]() The vinyl needs to be unrolled, cut by hand around obstacles, attached with fasteners and carefully taped along every seam prior to the installation of the drywall layer. So the delivered material cost averages $2.50 to $3.00 per square foot. Cost Considerations One pound per square foot vinyl sells for $1.50 to $2.00 per square foot at many online stores plus shipping (add about $1 per pound for UPS). This is an improvement of about 15% less noise as heard by humans. Three other full scale tests have now been published which show MLV on one side of a 24OC wood stud wall at STC 43 to STC 45. Unfortunately that test was conducted on a single wall section (4' x 8') rather than the required 8' x 12' wall, thus rendering the test invalid as it does not meet the requirements of ASTM E90. Actual Performance There is one test from an independent lab showing a branded mass loaded vinyl at over STC50 on a 24OC wood stud wall. For significant improvements, one must change this path fundamentally, or introduce specific damping into the structure. The addition of a vinyl layer does little to change this since the outer gypsum will be nailed or screwed directly through the vinyl into the stud. Sound Transmission in Walls In a single stud assembly, the major path of sound transmission is directly through the studs rather than the air in the cavity. Remember individual STC values do not add up. ![]() That is, a doubling of mass of the entire structure! When considering any product for soundproofing it is imperative to look for independent lab tests on full scale 8' x 12' walls performed to a current ASTM test method (ASTM E90 and E413). Adding mass to a wall follows mass-law which states that a doubling of wall mass adds about 5 to 6dB of isolation. In fact, an extra layer of gypsum adds only 2-3 STC points to any wall. But you cannot add that 28 to a wall of 30 and get 58. ![]() For example, a single sheet of 5/8 inch thick gypsum board by itself has an STC of 28 - 2 points higher than that of one pound vinyl. The acoustic ratings of individual materials cannot be added to existing walls. However presenting bare product performance is not related to the performance in an actual wall. Vinyl sellers display transmission loss data of bare sheets showing an STC of 26 or more. However a wall already weighs 4 to 5 pounds per square foot before mass loaded vinyl is added, so the extra pound added by a single layer of vinyl is only a small amount of added mass. For this type of acoustical treatment, the mass of the materials is the dominant factor. The best way I can think of currently is to ceiling mount some speakers and just keep the TV audio disabled during the evenings/mornings.Acoustics and Vinyl Noise can be attenuated with additional mass and many companies make vinyl sheets weighing about one pound per square foot. Looking for ways you think I could float the TV or some speakers so sound won't transfer through the studs too. I have seen a few mentions overseas of people putting a layer of Mass Loaded Vinyl beneath the wallboard, does anybody have any experience with this? And if so, any ideas where in Wellington I could source some from to cover a larger area (~15sqm)? Found this post but it's locked. I'm thinking of running 13mm Noiseline and potentially putting it on top of GIB Rondo on one side with the acoustic clips, of course with acoustic insulation too. The TV is going to be on the opposite side of the wall as the bed is up against, so really wanting to get this right. Looking at soundproofing options between the living room and the master bedroom. Long time reader but one of my first posts of many to come as I embark on a larger renovation project. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |