DP955^®

DP955® Performance

DP955® is designed not only to be stronger than traditional profiles but also more cost effective and faster to install. Its design provides stronger ribs to protect against buckling and a wide style pan to allow for safe foot placement.

DP955® is designed not only to be stronger than traditional profiles but also more cost effective and faster to install. Its design provides stronger ribs to protect against buckling and wide style pan to allow for safe foot placement. With a wider cover width of 955mm, fewer DP955® sheets are required to be installed, saving both time and money. DP955®’s original look creates a distinctive and diverse design unlike traditional profiles ensuring a unique finish

Sheet Tolerances

Cover: ± 5mm Sheet length: +10mm, -0mm

Roll-forming facility location: Auckland and Christchurch 

Notes 

1. DP955® requires to use of Load Spreading Washers (LSW) to achieve maximum loading on span tables shown. 
2. Where purlin spacings for roofing exceed 1.5m for 0.40mm or 2.0m for 0.55mm, side lap fastenings (stitching screws) must be installed. 

3. When notching flashings around DP955® rib, use straight cuts rather than following the curve. 

    

   Where long sheets are used consideration must be given to:

   • Special transportation licences for sheets over 25m 

   • Site access for special lifting equipment 

   • Fixing techniques to accommodate thermal expansion.

DP955® Limit State Load / Span Capacity

(span in mm, distributed serviceability loads in kPa)

Notes:

1. In Restricted Access Roof and Non-Access Roof & Wall applications, spans exceeding the maximum values shown should not be used. The maximum spans for Restricted Access Roofs are based on static point load testing as a guide and are further limited by practical experience of roof performance under dynamic foot traffic loads. For Non-Access Roof & Wall applications, the maximum spans are limited to ensure satisfactory appearance for wall cladding.
 

2.   Loads given are based on 3 screw fasteners/sheet/purlin.
 

3.   Loads given are limited to a maximum of 4.5 kPa. If design requirements exceed this limit, contact Dimond for specific advice.
 

4.  Duraclad®
 – Serviceability Limit State loads are not applicable to the Duraclad® material, as it does not experience permanent deformation. 
– System must include Safety Mesh if intended for use as a Restricted-Access roof. Refer Section 2.2.1.8.
 

5. N/R = not recommended.
 

6. End span capacities given in this table are based on the end span being 2/3 of the internal span.

7. Design Criteria for Limit State Capacities
a) Serviceability Limit State (SLS Design) 
No deflection or permanent distortion that would cause unacceptable appearance, side lap leakage or water ponding, due to foot traffic 
point loads, inward or outward wind loads or snow loads.
b) Ultimate Limit State (ULS Design) 
No pull through of fixings or fastener withdrawal resulting in sheet detachment due to wind up-lift (outward) loads.

8.  System Design 
The span capacity of the roofing or cladding profile is determined from the Load Span Table, using the section of the chart appropriate to the grade and type of material, and the category of serviceability selected from the two categories above. Serviceability loads have been derived by testing according to NZMRM procedures. To obtain an ultimate limit state load, we recommend factoring the serviceability load by 1.4 in line with NZMRM guidelines. 
Note: The capacities given do not apply for cyclone wind conditions.

Serviceability Requirements  
While these categories are provided for design guidance to meet the serviceability limit state criteria, foot traffic point load damage may still occur if point loads are placed carelessly.

Service Category  
Refer to MRMCOP 3.7.4 Roof Traffic. The designer must consider the degree and type of foot traffic expected on a roof. The following equirements are subjective standards and must be considered in line with customer expectations, building use, and type. More robust design than specified below (such as reducing purlin spacing or adding protection from mechanical action) is required for roofs that are regularly accessed, used as staging by subsequent trades, or areas adjacent to access points, particularly step-down access.

9.  Wind Pressure Guide 
As a guide for non-specific design the following S.L.S. design loads in accordance with the MRM Roofing Code of Practice can be used for buildings less than 10m high, otherwise AS/NZS 1170.2 should be used Low wind zone = 0.68kPa, Medium wind zone = 0.93kPa, High wind zone = 1.32kPa, Very high wind zone = 1.72kPa and Extra high wind zone = 2.09kPa

Fasteners

The durability of the fasteners should equal or exceed that of the material being fastened, and the fastener metal or coating must be compatible with the cladding material if in contact. Refer to NZS E2/AS1 table 20 for compatibility requirements. 

The minimum embedment of 30mm is the requirement for screws fixing into timber and minimum of three threads to pass through steel. When fastening through cavity battens, thermal break materials etc ensure the length of the screw is increased to accommodate the extra material.

Where screws are used without load spreading washers, the profile’s load span ability is reduced by 60%. 

Long spans above 1.5m for 0.4mm and 2.0m for 0.55mm require the specification and use of side lap stitching screws – see Section 2.3.2C Installation Information: Layout and Fastening

Design Example

Restricted access roof, 0.55mm G550 steel DP955® has a maximum end span of 2700mm and a maximum internal span of 4000mm. The following distributed load capacities apply.

Fastener Layout Options

DP955 Residential Roofing

DP955 Commercial Roofing

DP955 Residential Cladding - Vertical

DP955 Residential Cladding - Horizontal

DP955 Commercial Cladding - Vertical

DP955 Commercial Cladding - Horizontal