Dualroof

Thermal Performance

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, in buildings that require climate control or air conditioning heat loss can diminish the benefits derived from the use of natural daylight. The solution: the Ampelite Dualroof insulated skylight system.

Ampelite Dualroof 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, Ampelite Dualroof 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 heat loss.

The Dualroof system consists of a fibreglass top sheet and a Lexan 2 wall or 5 wall bottom sheet with a 20mm air gap between the two sheets. Depending on which Lexan sheet is utilized, the R-value of the sheets and air gaps are then added together to calculate the total R-value of the complete system.

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 to solve the problem of condensation forming due to the gathering of large numbers of people.

Wonderglas S-996 or Cool-lite IR Top Sheet

The Wonderglas S-996 top sheet can be supplied in either clear or opal colour. where lower heat transmission is required while still allowing excellent light transmission, we suggest using our Cool-lite IR Solar control sheeting. Both Wonderglas S-996 and Cool-lite IR are protected by the highly UV resistant Silmar 996 gel-coat developed in the United States through BP Chemicals and used widely throughout New Zealand and Australia since 1995.

For applications where the skylights need to be able to withstand foot traffic, we recommend using our Webglas GC – trafficable fibreglass sheeting.

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.