This versatile product comes in various sizes and with a large range of glazing types and finishes. The low-rising polycarbonate dome is aerodynamic and provides extra ventilation via it’s electronic hinge on the rooflight. The Mardome Trade Dome Electric Hinged Rooflight caters for all consumer needs with it’s customer friendly stylish variations and sought-after options.
Measuring & Installation Guide
Please find installation guidelines below. A downloadable PDF link is at the bottom of this page along with a product data sheet should you require these to assist.
Range Of Sizes
If your requirements fall outside of what we supply, we will happily discuss your options and further guide you should you desire. Standard sizes are available in 150mm increments starting at 600x600mm all the way up to 1800x1800mm.
Instructions To Measure For Builders Upstand Installation
Measure external builders upstand
• Fixed / unvented domes = dome size +20/-20mm
• Opening / vented domes = dome size +40/-20mm
For example, height of the upstand should be 150mm high and the width should be 75mm if you are fitting on a builders upstand. As demonstrated in red above, your external timber size should match that of your purchased item (drop-down menu on our website) e.g both should be 900x900mm. If you purchase a 900mm by 900mm from the drop down menu on our website your external timber size as shown in red above (Measure here) should be 900mm by 900mm.
Instructions To Measure for Domes With PVC Kerb
Measure internal roof opening
Acceptable tolerance = dome size +20/-30mm
For example, the drop-down menu on our website allows you to choose the measurement you require. If you buy with a 150mm or 300mm high upstand and you buy a 900x900mm from the drop down menu then your timber size (shown above in red) which is your structural opening size should also be 900x900mm.
TB189 Installtion Mardome Trade Powered Opening(Click here to view PDF)
*Centre pane U-value is a measure of the thermal efficiency of the glazing type.
#Ud-value is a measure of the thermal efficiency of the whole rooflight (calculated in accordance with NARM Technical Document NTD2).
~Glass glazing option is not available with the access hatch option and limits other opening options depending on size
Part L Building Regulations require a U-value of at least 2.2W/m2K: Brett Martin Daylight Systems recommend the use of at least triple skin rooflights in all applications
The light transmission properties of the polycarbonate rooflight are displayed in the table below:
Clear – high visibility
Maximum transmission of light
Pristine vision of sights and all objects through the dome via maximum clarity
Opal – diffused light and solar control
A unique combination of high levels of diffused light transmission and privacy.
Ultimate prevention of solar glare and mass reduction of solar heat gain
Reduced visual capacity by impairing vision through the dome of sights and objects
Patterned – privacy
High levels of light transmission combined with personal privacy
The diffusion of natural daylight
The heightened impairment of vision through the dome
Builders upstand (opening / vented)
The dome comes with a uPVC frame. This attaches to the top of the builders upstand and all housing ventilation/opening equipment.
For mounting at roof surface level, providing 150mm of waterproofing height (exact kerb profile varies with specification)
Typically mounted below roof surface level, to provide 300mm of height for waterproofing and insulation
2 manually operated hit and miss trickle vents providing combined 8400mm² equivalent area ventilation. Please note trickle vents cannot be supplied with 450mm by 450mm size.
TB189 Installtion Mardome Trade Powered Opening (1)(Click here to view PDF)
The design life of actuators is at least 10,000 cycles and where present, electrical actuators are guaranteed for 1 year. Our units are guaranteed for a period of 10 years but are anticipated to continue to be fit for purpose beyond this. We expect them not to distort and lose weather-tightness, not to become perforated or lose any major structural efficiency for around 20 years.
Delivery & Lead Time
For custom size orders, the lead time will inevitably vary for your bespoke product. For all standard size orders that are placed before 12pm, the lead time is generally 2-3 workings days.
Please note that the transport company is not responsible for delivering inside the property. They are not insured to do this so you will need to ensure an appropriate person is designated and on site to offload the product out of the vehicle once the driver arrives.