SRP™ WHISPERWALL™ Information and Specifications
»» To achieve the required STC rating wall, use full height sheets only as specified in SRP™ STC and FRR specification [TABLE 8].
»» Vertical sheet joints are touch fitted and must occur over framing. Stagger vertical sheet joints on opposite sides of the frame by 600mm [see FIGURE 32 below].
»» Where horizontal sheet end joints are unavoidable they must be over SRP™ Nogs and offset outer layer joints from those in the inner layer.
»» The inner layer of 13mm GIB Noiseline® must be fitted hard to the floor [see FIGURE 30 and FIGURE 31].
»» For fastening use 25mm x 6g GIB® Grabber® Drywall Self Tapping Screws at 300mm centres vertically, 75mm from sheet top and bottom ends ensuring all screws are clear of the top and bottom SRP™ Track and 12mm from sheet vertical edges as per FIGURE 30 and FIGURE 31. Also ensure that all screws are clear of the SRP™ Whisperwall™ internal “flutes”, as it could compromise the tested STC rating of the wall.
NOTE: Maximum distance for the screw measured from the outside edge of the SRP™ Whisperwall™ Stud profile is 25mm. Please check the length of the screw used, to ensure it is well clear of the SRP™ Whisperwall™ internal flutes [see Figure 1].
»» Apply a bead of acoustic sealant GIB® Soundseal* around the entire perimeter of the inner lining, ensuring it is clear of the steel frame and SRP™ Tracks. Before the set off time of the acoustic sealant, install the outer lining if applicable, by bedding it into the bead.
*SRP™ Whisperwall™ was tested using GIB. Soundseal; other acoustic sealants, with properties equal or better may also be used once verified by an acoustic engineer.
»» The outer layer of 10mm GIB Noiseline®, if applicable, is fitted hard to the floor and bedded onto GIB® Soundseal acoustic sealant applied around the inner layer before the set off time of the acoustic sealant. Offset the sheet joints between layers by 600mm [see FIGURE 32 below].