Efficient thermal insulation and excellent lighting of the room at the same time: the alwitra rooflights provide optimum thermal protection. At the same time, outstanding lighting of the room is achieved through efficient light dispersion and low light loss. All alwitra rooflights are equipped with a burglary-resistant screw system protecting against burglary and providing increased security.
Types of the alwitra rooflights
As standard, alwitra rooflights are available as double-shell, triple-shell or multi-shell versions with additional thermal insulation properties. The thermally insulating version provides optimum thermal protection as well as outstanding lighting of the room through efficient light dispersion and low light loss. alwitra rooflights are equipped with a burglary-retardant screw system.
The double-shell version (U value: 2.68 [W/m²K]) consists of two domed extruded polymethyl methacrylate shells (PMMA). Acrylic glass is a highly transparent, impact-proof and UV resistant plastic. The standard version consists of two opal shells; a version with two transparent shells is available on request.
The triple-shell version (U value: 1.70 [W/m²K]) consists of three domed extruded polymethyl methacrylate shells (PMMA). The standard version consists of two opal shells and a transparent middle shell; a version with three transparent shells is available on request.
The multi-shell rooflight 2S WD (U value: 1.23 [W/m²K]) consists of a transparent domed outer acrylic glass shell (PMMA), a 10 mm domed transparent SPC sheet and an opal inner acrylic glass shell. Due to their outstanding thermal insulation characteristics, these rooflights are the ideal solution for buildings with increased thermal protection requirements.
Opening and ventilation systems for alwitra rooflights
Rooflights can also be used for room ventilation, as a natural smoke vent with geometric cross-section or for providing access to the roof. For all types of opening, in general, a vent frame is required where all necessary parts are included and prefitted.
For available versions and combinations please refer to our current price list.
- Manual opening (manual telescopic spindle)
This is the most simple way of opening. The manual telescopic spindle is hooked to the brackets at the upstand and the vent frame. The rooflight is opened by turning the optionally available crank handle. If the side length (light opening size) exceeds 130 cm, a tandem version with two interconnected spindles is installed. For some versions, manual opening can be combined with a roof hatch function.
- Electric opening
An electric actuator 230 VAC provides significantly more comfort. You can control the actuator with a switch or an optional remote control. As for manual opening, if the side length (light opening size) exceeds 130 cm, a tandem version with two electrically interconnected actuators is installed. For some versions, electric opening can be combined with a roof hatch function.
- Roof hatch (manual operation)
alwitra rooflights can be installed as roof hatches with manual opening to provide access to the roof e. g. for the chimney sweep or for maintenance and repair works. Gas springs on both sides facilitate the opening and closing of the rooflight. Along with the roof hatch function, the system can also be combined with the options of a manual spindle, electric opening or natural smoke vent.