Door Set Energy Ratings
Door Set Energy Ratings (DSER’s) were introduced on 1 September 2011 to the entrance door market, to provide a simple yet effective way of assessing the energy efficiency of residential external doors such as composite doors.
Rockdoor are the only composite door manufacturer to have an entire range of doors available with an A-Rating as standard. Your Rockdoor installed by South Lakes Windows Ltd will have an energy rating sticker attached to the door.
A-Ratings on composite doors are achieved using many innovative techniques, ensuring that heat loss is the lowest in the industry. The Rockdoor Ultimate Series features high performance low-emissivity soft coated glass which offers excellent thermal insulation when incorporated within a double glazed unit filled with argon gas and warm edge spacer bars.
Ultimate Series Doors
Featuring a 50mm thick door sash, argon filled double glazed unit, soft coat thermally efficient glass and a carbon fibre reinforced innerframe, Rockdoors Ultimate Series is available with an A-Rating (if chosen with clear backing glass) as standard -a first in the industry across a range – making it the most advanced thermally efficient and secure composite door available.
Energy Rating & Backing Glass
When choosing your Rockdoor Composite Door, we recommend choosing clear backing glass (the piece of glass on the double glazed unit behind the glass design) ensuring optimal thermal performance. This is because we can only use our Soft Coat thermally efficient glass on clear glass. When patterned backing glass is used, this reduces the energy rating as this style of obscure glass cannot use this technology.
However, even if your Door Set Energy Rating drops slightly, you can still feel confident that your Rockdoor will keep more heat in the house than other external composite doors on the market.