Dualroof Industrial Fibreglass Roofing

Overview

In today’s environment of increased conservation-awareness, the reduction of energy consumption and the importance of using environmentally-friendly products cannot be overlooked. Using natural daylight as a lighting alternative is very much an effective tool in reducing energy consumption; however, heat loss can diminish the benefits derived from this use of natural daylight. The solution: the Ampelite Dualroof System. The Ampelite Dualroof System uses the fundamental principles of double-glazing to create a simple yet functional insulated sky lighting system. Overseas countries with colder climates use complicated double-glazed skylights to prevent heat loss, but the Ampelite Dual Roof System has specifically been designed for the New Zealand climate. With simplicity and ease of installation a high priority, the system provides natural daylight whilst also ensuring minimum loss of heat.

Condensation Control

The formation of condensation on the skylight panel due to internal warm moist air meeting with a cold skylight surface is fully eliminated. Sports stadiums and multi-purpose halls have been quick to embrace the Ampelite Dual Roof System in order to solve the problem of condensation forming due to the gathering of large numbers of people.

Wonderglas GC or Coolite IR Top Sheet

The special resin technology used in the highly UV-resistant surface coating of the top sheet is the same as that used for Ampelite's premium grade Wonderglas GC, now very widely used in major projects around New Zealand. For improved visible light transmission and lower heat transmission, we suggest using our Coolite IR Solar control sheeting as the top skin of our Dual Roof System.

Fibreglass Dualroof Systems

• DR20: DR20 is designed to be easily installed with most commercial roofing profiles. DR20 consist of two sheets of fibreglass roofing with differing profile heights. This allows the top sheet to sit on the rib of the bottom sheet creating a 20 mm air gap between the pans of the sheets, depending on the profile height of the bottom sheet. For this reason, DR20 does not have the same thermal performance of Dualroof MAX (below).

• Dualroof MAX: To get the maximum performance from a double-skinned skylight, the two sheets of fibreglass roofing should not touch at any point, in order to maintain an air cavity between sheets, as areas where the sheets touch can allow heat to escape. The air cavity needs to be airtight as air flow between the two sheets can impact on the thermal performance of the system. Dualroof MAX utilises high-density foam spacer blocks to hold two sheets of the same profile apart, thus maintaining the air cavity, and a closed cell foam tape to seal the sides and ends of the sheets.

• Triroof: As with the DR20 system, the TR20 is designed to be easily installed with most commercial roofing profiles. TR20 consists of three sheets of fibreglass roofing with differing profile heights. This allows the top sheet to sit on the rib of the bottom sheet creating a 20 mm air gap between the pans of the sheets, depending on the profile height of the bottom sheet. For this reason, TR20 has the best thermal performance of all the fibreglass Dualroof systems.

• DR-TW2: DR-TW2 uses a fibreglass top sheet and a Lexan Multiwall two-wall polycarbonate bottom sheet. DR-TW2 is designed to be easily installed with most commercial roofing profiles with the Lexan bottom sheet providing a smooth flat surface to the underside of the skylight which is very aesthetically pleasing to the eye. A profiled fibreglass spacer strip is used at the purlin line to lift the top fibreglass sheet off the Lexan bottom sheet, creating an extra air gap between the two sheets, thus adding to and increasing the thermal performance of the DR-TW2 system.

• DR-TW5: As with the DR-TW2 system, the DR-TW5 system uses a fibreglass top sheet; however, for increased thermal performance, the Lexan Multiwall two-wall polycarbonate bottom sheet is replaced by a Lexan Multiwall five-wall polycarbonate bottom sheet. The extra air cells in the Lexan five-wall sheet increase the R value from 0.30 to 0.54.
  The surface finish properties of the Lexan Multiwall sheeting used for the bottom sheet in the Dualroof Premium Systems have been assessed in accordance with the ISO 5660 and achieved a group number ‘3’ performance in accordance with NZBC Verification Method C/VM2 Appendix. The full test report is available by request from your local Ampelite office.

• FIRE PERFORMANCE: The Lexan Multiwall used on the bottom sheet has achieved an Internal Surface Finish Group number of 1-S according to performance determined under the conditions described in ISO 9705:1993 required by NZBC clause C3.4(A). Performance is achieved through MBIE Guidance on European Classification.

Available Colours; Light and Heat Transmission

All Dualroof Systems are available in Clear and Opal. For improved visible light transmission and lower heat transmission, we suggest using our Coolite IR Solar control sheeting as the top skin of our Dualroof System. For information on other colours, please contact your local Ampelite office.

Available Profiles & Spanning Capacity

For information regarding recommended spans in high wind and cyclonic regions, please contact your local Ampelite office.

R Value Calculated to NZS 4214 - 2006

Accessories

Ampelite have a large range of accessories available to help make the installation of Dualroof fast and professional. These accessories include a range of self-drilling fasteners that oversize the holes as they pass through the sheet and self-adhesive tapes and profiled form-filler strips for vermin protection. Please download our Industrial accessories brochure. Industrial accessories brochure.

Correct Installation is Important

Ampelite Dualroof shall be installed in accordance with Ampelite fixing instructions and with AS/NZS 1562.3:1996, Design and installation of sheet roof and wall cladding, Part 3: Plastic, the requirements of the NZ Building Code and the NZ Metal Roofing Manufacturers’ Association Code of Practice. For full installation details, please download a copy of our installation guide.

Please note these additional important requirements

• The Ampelite Dualroof system shall be installed using the fastening length applicable to the main cladding, together with a metal profile washer and EDPM seal. This combination gives a secure and weather-tight finish. The fixing screws should not be over-tightened to such an extent that the sheet buckles, allowing water penetration at the seal or sheet overlap.

• Fixing should be made at every crest at both ends of the sheet and at every second crest at intermediate purlins.

• Where the Ampelite Dualroof system is in contact with safety mesh, an Ampelite purlin protection strip must be installed over the safety mesh to avoid fracturing of the underside of the sheet. Where end-lapping of the sheet is required, a minimum of 300 mm overlap is essential. Ampelite recommends the use of 25mm Lap Seal Tape at the top and bottom edges of the purlin. This ensures the strips are concealed. For Decking profiles, two continuous beads of a clear non-hardening sealer (i.e. silicone), must be applied across the full width of the decking within the overlap.

• IMPORTANT: The Ampelite Dualroof system should be installed by pre-drilling oversized holes to allow for expansion and contraction. The basic calculation is 0.75 mm per lin. /m, plus shank diameter of screw. Do not over-tighten screws. EXAMPLE: 10 m sheet - 10 (m) x 0.75 (mm) + 4 mm (fastener) = 11.5 mm pre-drilled hole.

• CYCLONE ZONE INSTALLATION: Installation in cyclone-prone areas follows the recommendations and code for normal fixing, but further specific requirements must be met. Please contact your local Ampelite office for the latest information.

• Dualroof features a 25-year warranty

• full warranty details, please download a copy of the Dualroof brochure or contact your nearest Ampelite office.

Handling, Storage, and Disposal

The Ampelite Dualroof system is non-trafficable. The sheeting should always be stored in a dry and fire-safe area and handled with care to avoid damage to the surface coating as warranties will not apply to sheeting that has been damaged in handling or has received mechanical damage as a result of foot traffic.

Safety Data

There are no ill effects from handling Ampelite Fibreglass sheets as a finished product. Some exposure to airborne particles occurs on drilling, cutting, and trimming of the material. Although there are no known cases of harmful effects, even after long-term exposure, it is recommended to take certain precautionary steps.

• Eye contact: Can cause irritation. Appropriate eye protection should be worn. If irritation occurs due to exposure to dust particles, wash eyes with running water using an eye bath or wash bottle. If irritation persists, seek medical attention.
• Skin contact: Can cause irritation. Shower thoroughly using soap and a cloth or sponge.
• Inhalation: Dust masks are recommended although particles are not respirable.
• Ingestion:Non-toxic. Extensive studies have revealed no serious effects.