The Urban Seam® panel is a fully supported roof panel, comprising an outer skin profiled from 0.7mm thick, galvalloy treated, grade S220GD steel sheets to BS EN 10346: 2009. The sheet is treated with a 200 micron coating on the exposed face and a 10 micron polyester coating on the reverse face.
Wind Uplift deflection values
Specification of the 305mm/514mm wide panel is dependant on location, wall height, storey height and roof pitch. A structural engineer should complete a wind uplift calculation for your specific area before making any final decision. Please note the table below is for guidance only:
| Roof pitch (degree) and wall | No. storeys | Wind speed V2 | Panel width 305mm | Panel width 514mm |
|---|
| (5-9) | <3 | ≥25 | Y | N |
| (5-9) | 4 - 6 | ≥25 | Y | N |
| (5-9) | <3 | <25 | Y | Y |
| (5-9) | 4 - 6 | <25 | Y | N |
| (≥10) | <3 | ≥25 | Y | Y |
| (≥10) | 4 - 6 | ≥25 | Y | N |
| (≥10) | <3 | <25 | Y | Y |
| (≥10) | 4 - 6 | <25 | Y | Y |
Load Span Tables
All load span calculations should be calculated by a structural engineer for the project. All load span information is based on the boarded structure on standard 600mm or 400mm centres a structural engineer should be consulted for any further information.
Uplift wind deflection values (KN/m²)
| | 10mm deflection | 20mm deflection |
|---|
| 305mm | 3.49 | 6.98 |
| 514mm | 0.73 | 1.46 |
Build-up examples
Urban Seam® profile is fixed to 18 mm Ply or OSB 3 board, with a separating layer of breathable membrane (15 mm board is used for SIP panels). For other board types and dimensions please contact Colorcoat Urban®. Below this, warm roof and cold roof build-ups can be accommodated. More comprehensive detailed advice on this is available from the Colorcoat Urban® team.
DoP
Under the CPR, all products used in construction must now have CE Marking. This provides clear indication that it meets the requirements of the relevant harmonised standard, and has been approved by a Notified Body to apply the CE Mark. The Urban Seam® Declaration of Performance provides information on the essential characteristics of the Urban Seam® profile and that it conforms to its declaration.
Condensation risk
In common with all metal roof constructions, there is a risk of condensation. This can arise as either interstitial condensation within the roof construction or surface condensation at thermal bridges.
To prevent condensation forming between the metal sheets and the substrate, measures should be taken to minimise water vapour reaching the OSB board by incorporating:
- Vapour control layer in the roof construction and providing an adequate seal around ceiling.
- Breather membrane in the roof construction to allow the air to circulate freely.
- Adequate insulation level meeting current U-values.
Resistance to soft and hard body impact: In accordance with MOAT 43: UEAtc Directives for impact testing opaque vertical building components. Part 2.2.1: Impact from large soft bodies and MOAT 43: UEAtc Directives for impact testing opaque vertical building components. Part 2.2.2: Hard body impacts.
In a roof and wall installation, the panel will have adequate resistance against hard and soft body impact in combination with the standard wood board build up.
Sound and Noise
The Colorcoat Urban® standing seam roof requires a substrate Ply or OSB 3 board or SIP panel, and is no noisier than standard slate, concrete or clay tile. In many cases the transfer of airborne noise is less than alternative materials.
Sound levels or loudness are expressed in decibels (dB). The decibel rating is a representation of the intensity or volume of the sound. The intensity of the sound depends on the pressure level and can be accurately quantified by a sound level meter.
When considering the acoustic performance requirements of a building there are a number of criteria to consider which include airborne noise; impact noise; internal noise reverberation; and flanking.
Fire
Colorcoat Urban® is tested against all the required fire tests. It carries a ‘low risk’ classification and meets Class 0 requirement as defined in the Building Regulations for the UK. When used as part of a roof cladding system, the Colorcoat Urban® seam can achieve a Class AA performance rating when tested to BS 476 Part 3: 1958.
The performance of a building in a potential fire situation must be seen as a fundamental requirement and it is essential that this be considered at the initial design stage. Compliance with the Building Regulations is a major consideration for fire performance:
The focus is specifically on the building envelope and understanding how to satisfy these requirements when using Colorcoat Urban Seam® wall and roof cladding system. While the choice of building envelope materials is of key importance, it should be seen as part of an overall strategy of compliance and risk management. Where risks are high or difficult to control, more emphasis needs to be placed on the intrinsic performance of the building components.
Provisions for external surfaces of walls: Approved Document B1 specifies the performance requirements for the external surface of walls according to building height and location.
Figure 1 summarises these requirements for a range of building types and locations.
Approved Document B1 specifies the performance requirements for external roof coverings according to location in relation to the distance of the building from a relevant boundary. Figure 2 sets out the minimum requirements that are stated according to European EN 11875 and National BS 476 – 33.
Figure 2. Performance requirements for roof coverings
There are no restrictions on the use of roof coverings that are designated AA, AB or AC, National Class, or B ROOF (t4), European class. Roof products which meet the requirements stipulated in Commission Decision 2000/553/EC can be considered to satisfy the requirements without the need for testing.
Colorcoat Urban® roof and wall cladding systems meet all the requirements for all external roof and wall coverings.
