 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Natural Science Forum / Physics / Acoustics / May 2005Recommended Floor/Ceiling Impact Ratings
I am trying to locate recommended IIC ratings (or equivalent) in buildings for various situations used around the world. Uniform Building Code (UBC) requires a minimum IIC rating of 45. BOCA requires a minimum IIC of 50. ANSI SI S12.60-2000 "Acoustical Performances Criteria, Design Requirements and Guidelines for Schools" recommends 45-50 above core learning spaces and 65-70 where there is a high impact area over a core learning spaces. What are the recommended IIC ratings elsewhere around the world ? or the recommended Ln,w, Ln,Tw+Ci rating in Building Codes elsewhere ? Any references greatly appreciated Brian Brian, The numbers in the US Building codes should be considered as absolute minimums. In the 1960's, the US Dept of Housing and Urban Development issued some guidelines for both STC and IIC in three grades of construction. Between similar rooms in either luxury housing or housing in a quiet community, they recommended 55. For more typical communities, 52, and for noisy communities, 48. Higher ratings were recommended where rooms were dissimilar such as a kitchen over a bedroom. In recent years, the trend among consultants in North America is to recommend walls with higher laboratory STC ratings, recognizing both the common field flanking problems and the growth of high power music systems. >I am trying to locate recommended IIC ratings (or equivalent) in buildings >for various situations used around the world. [quoted text clipped - 11 lines] > > Brian Hello, In Norway, the minimum requirements for dwellings is Rw'>=55dB and Ln,w'<=53dB. Note that is FIELD measured values. In Sweden, I think is Rw'50-5000>=55dB and L'n,w50-5000<=56dB. The swedish requirements take into account low frequencies disturbance which typically occurs with wood contruction. This is taken also in account in the norwegian requirements but only as guidelines for improved sound insulation. We use constructions with laboratory measurements 4 - 6 dB better the field requirements. Fortunately, it has been done an extensive work through the years by the Norwegian building research center to collect field measurement datas made by theme selv and other concultants. The results is a database giving expected field values for a great number of different constructions. VERY usefull! Alain Bradette > Brian, > > The numbers in the US Building codes should be considered as absolute > minimums. > [quoted text clipped - 23 lines] > > > > Brian In Australia the current floor/ceiling Ln,Tw+Ci value in our latest Building Code is 62dB (as tested in the field). As the Ci value is a -ve value, then removeing the +ci value leads to an Ln,w value that is even higher. The equivalent IIC would be more likely 45 or less. In the area of wall ratings at least our STC requirement has gone from STC 45 to the equivalent of STC 55. While agreeing that the building code values are minimum values, the building industry takes these as the minimum/maximum that needs to be achieved without any graduation (Grade I, Grade II, Grade III) as in the HUD values. > Hello, > [quoted text clipped - 13 lines] > > Alain Bradette |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.