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Internal partition SRP™ Stud height limitations are determined in compliance with loading and design requirements for the relevant Standards, mentioned in the compliance section.

Wind Speeds have been grouped into 5 Wind Zones and are noted on SRP™ Stud Height Tables, where all different Wind Zones are colour coded [single SRP™ Studs lighter, boxed SRP™ Studs darker shade of the same colour] for easy use. The table contains separate values for different internal pressure co-efficient [Cpi] values. If in doubt as to which Cpi value to use in a particular instance, contact SRP™ and/ or a structural engineer for confirmation. For values and description refer to SRP™ Stud Height Tables.

To ensure correct SRP™ Stud Selection, the following process must be followed:

1. Determine the Site Specific Wind Zone [Low, Medium, High, Very High or Extra High] using one of the following:

a. For structures of one to two storeys, Council supplied Wind Zone information may be used
b. For structures greater than two storeys, use SRP™ Wind Zone Table [TABLE 5] in the following way:

i. Check if you are outside of the Lee Zone by using the New Zealand Wind Regions map [see FIGURE 4]. If you are within the Lee Zone seek advice from SRP™ and/or a structural engineer.
ii. Check if you are outside of the Local Topographic Zone [see FIGURE 5]. If you are within the Local Topographic Zone, seek advice from SRP™ and/or a structural engineer.
iii. Select your Importance Level from TABLE 3.
iv. Select your Terrain Category from TABLE 4.
v. Determine your Wind Region by using the New Zealand Wind Regions map [see FIGURE 4].
vi. Determine your reference Height by using FIGURE 6.
vii. By using the above parameters, determine the site specific Wind Zone from SRP™ Wind Zone Table [TABLE 5].

c. Or, seek advice from SRP™ and/or a structural engineer.

More Information

There could be many feasible SRP™ Stud options for any given situation. Please consider the various combinations of SRP™ Stud size, BMT, SRP™ Stud centre and the use of single/boxed SRP™ Stud scenario and choose the most suitable option for the application, taking into consideration the cost of material, handling and installation, cost of the entire wall including the plasterboard.

SITE SPECIFIC WINDS ZONE TABLE

In addition, potential disturbance due to soft body impact loads should be carefully considered for each given wall type/location. The limit for soft body impact loads is given in the SRP™ Stud Height Tables [Tables 6.1 – 6.5]. It is the responsibility of the specifier to determine requirements in situ.

 

1. For walls greater than 4m height, contact SRP™ as a specific engineering design may be required. NOTE: Maximum wall heights may require further design for some structures, and it is the responsibility of the specifier to ensure adequate serviceability considerations are given to higher walls.

2. Maximum SRP™ Stud Heights for Wind Zone as specified for varying SRP™ Stud sizes, Cpi values and maximum SRP™ Stud centres. Closer SRP™ Stud centres may be used if required.

3. For structural and/or serviceability purposes use SRP™ Continuous Nog Tracks

4. Tables are for internal partition [non-load bearing] walls only, subject to lateral wind pressures. No consideration has been given to any applied horizontal or vertical loads from shelving or other wall-hung/attached objects aside from self-weight of the wall and its linings. Any applied horizontal or vertical load will require specific engineering design.

5. BMT = Base metal thickness, TCT = Total coated thickness.

6. All loads calculated in accordance with the requirements of AS/NZS 1170. Council supplied Wind Zone information may be used for structures of one to two storeys. For structures greater than two storeys, use SRP™ Wind Zone Table [TABLE 5], or seek advice from SRP™ and/or a structural engineer.

7. Calculations for strength and serviceability undertaken to the requirements of AS/NZS4600.

8. Material as per AS1397 G250 Z275 steel [or greater].

9. Serviceability calculations undertaken with a deflection limit of SRP™ Stud height/200 under serviceability wind load in accordance with the requirements of AS/NZS1170.0 – Table C1.

10. Serviceability calculations undertaken for soft body impact load in accordance with AS/NZS1170.0 – Table C1 to a deflection limit of SRP™ Stud height/200 or 12mm, whichever is the lesser.

11. The requirement for potential disturbance due to soft body impact loads should be carefully considered for each given wall type/location. The limit for soft body impact loads are given in the tables and it is the responsibility of the specifier to determine its requirement in the specific design application for each wall structure.

12. Consideration has not been given for fire. Specialist fire engineering will also be required for FRR walls.

13. Specific engineering design required for buildings with IL4 or IL5.

14. Tables are applicable for either single/double steel frame or staggered wall options with minimum 10mm Plasterboard* applied to each external face in accordance with Manufacturers’ requirements [see FIGURE 8, FIGURE 9 and FIGURE 10].

15. All walls to be lined both sides to minimum 80% of the floor to soffit height. For one side only lined service shaft walls, other single lined walls or both side lined walls to less than 80% floor to soffit height, double up on the SRP™ Studs by using boxed/back to back SRP™ Studs, or halved SRP™ Stud centre to centre spacing to be used as a minimum.

16. Determination of Cpi should be undertaken by a suitably experienced designer familiar with the requirements of AS/NZS1170.2. If the designer is in doubt as to the selection of this figure, the advice of SRP™ and/or a structural engineer should be sought.

17. Storage and installation should be in strict accordance with the SRP™ Product Catalogue and project specific design documentation.

18. Designers should factor in the effects of temperature and creep when selecting SRP™ Stud size.

19. SRP™ Stud Height Tables assume adequate capacity within overall building structure to withstand design loads applied from Steel SRP™ Stud Framing. This should be confirmed by the project Structural Engineer.

20. Maximum size of additional site created service holes to be max 15mm diameter. All holes must be 300mm centres apart, in all cases. Maximum of two additional holes per SRP™ Stud are allowed.

*Standard GIB. plasterboard is assumed, performance and/or specialty boards may also be used, subject to having equal or better structural properties.

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