To determine the number and position of SRP™ Continuous Nog Track use the SRP™ Nog Track table, [TABLE 9].
SRP™ Continuous Nog Track is stocked in 0.75BMT or 1.15BMT steel, with 30mm legs and the appropriate cut-out size for all standard SRP™ Stud sizes, at standard 300, 400, 450 and 600mm centres [see FIGURE 1 and FIGURE 17].
SRP™ Continuous Nog Track is available in 3m standard stock lengths. SRP™ Continuous Nog Track with alternate SRP™ Stud centre cut-outs is also available on request.
Using SRP™ Continuous Nog Track at SRP™ Stud midheight will enhance the serviceability deflection of the wall. From structural design aspects, no SRP™ Continuous Nog Track is required for walls up to 4m height, and for walls up to 8m height a single SRP™ Continuous Nog Track is required at mid stud height. For walls greater than 8m, specific engineering design is required [see TABLE 9].
In consideration of the design deflection aspect, SRP™ wall products are designed for L/200 deflection limit, which is up to 20mm for a 4m wall and up to 40mm for an 8m wall. Reduction of this deflection can be achieved by installing SRP™ Continuous Nog Track at mid stud height for walls of maximum 4m high, and maximum 2m centres for taller walls equally spaced over the height of the SRP™ Studs, as noted in TABLE 9. In addition, use SRP™ Continuous Nog Track with the top deflection SRP™ Track as indicated [see FIGURE 16].
If using SRP™ Continuous Nog Track, place the correct amount of SRP™ Nog Track over the bottom SRP™ Track, with flanges facing down and all SRP™ Stud hole cut-outs aligned at the required position. Then slide the SRP™ Studs through all the SRP™ Nog Track holes at each position before, by a rotating movement, clicking them in position between the top and the bottom SRP™ Tracks as described earlier. SRP™ Continuous Nog Track, as and where required, is to be positioned equally spaced over the height of the SRP™ Stud, or as specified [see TABLE 9 for more information]. Once all SRP™ Studs are installed, lift and secure all SRP™ Nog Tracks in position using 4mm pop rivet or 8g wafer head Tek screws to both flanges of the SRP™ Steel Stud.
SRP™ Continuous Nog Track is to be joined centrally between SRP™ Studs using an appropriate length of standard 0.75mm BMT [minimum] SRP™ Track. Minimum length of the connecting SRP™ Nog Track is to be stud centres spacing minus 40mm. Each overlap is to be secured using two 10g Tek screws in the web and two plus two into each leg of the SRP™ Track [6 screws in total for each overlap side] in accordance with the details provided in FIGURE 17. The entire SRP™ Continuous Nog Track connection is to be in-between two adjoining SRP™ Studs and no SRP™ Stud or other cut-outs are allowed through any part of the connection.
For unlined, partially lined or one side only lined SRP™ Studs with a SRP™ Deflection Head Track, use an additional SRP™ Continuous Nog Track installed facing downwards with the top of the SRP™ Continuous Nog Track being positioned 100mm below the SRP™ Deflection Head Track, as per FIGURE 16.