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Fixed Dome Double Skin with Vents & 15cm ECO Splayed Kerb 70x100cm

2 Customer Reviews
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    2.68 W/m²K



£360.42 inc. VAT
Product Code:
up to 2 working days
Size (W x L):
Skin Thickness:

Product Description

The complete package for the best price

When buying the fixed polycarbonate dome, you're getting the whole package. The PVCu upstand and the dome with thickness of your choice. The only thing you need onsite is flashing and this is whatever your roof material is, be it GRP, felt or rubber for instance.

Award winning upstands

It doesn't matter which one you choose, you have the peace of mind knowing that all our upstands are thermally broken and designed to help improve the overall thermal efficiency of your roof. Made from extruded PVCu and pre-finished white internally, it gives a perfectly finished design suitable for any interior.

The ECO upstand

The ECO upstand is the most thermally efficient, environmentally friendly rooflight upstand yet. Built with a strong nine-walled cellular structure, this thermally broken upstand also has a groove built into the upstand to allow for a smooth plasterboard finish. The ECO upstand has an overall U-value of 0.92W/m2K compared to the standard upstand that has a U-value of 2.2W/m2K

  • Density
  • Dimensions
    Thickness - 50mm
    Height - 160mm 

What is the best skin thickness for you?

  • Single skin - Recommended to only be used in uninhabited areas such as a garage, corridor, storage room (U-value: 5.36 W/m2K)
  • Double skin - Recommended to be used when replacing a dome, ie like for like replacement (U-value: 2.68 W/m2K)
  • Triple skin - Must be used on new builds to comply with building regulations (Part L Thermal Performance) (U-value: 1.78 W/m2K)
  • Quadruple skin - Recommended for best thermal performance (U-value: 1.24 W/m2K)

How secure are the roof domes?

Unique to our fixed roof domes are the high-security screwbolts, supplied factory fitted as standard to all units. Once installed, the fixing cannot be removed using common tools. The screwbolt provides a high level of resistance to tampering or forced entry.

The fixing screw or bolt is sleeved within the body of the screwbolt which avoids pressure being exerted on the rooflight glazing as the fixing is tightened. This virtually eliminates the risk of stress fractures caused by over-tightening.

Keeping your rooms ventilated

Even though you've chosen the fixed unit, you can have a controllable trickle vent built into two sides of the upstand. The ventilation can provide 8000mm2 ventilation area which assists with Building Regulations compliance.


When installed, the fixed domes are expected to exceed the life of the roof covering and will not rust or be affected by atmospheric pollution. They are maintenance free once installed. The domes are guaranteed against the effects of defective design, materials or construction for 10 years, subject to certain conditions. 

Dimensions shown is the roof opening size required.

Product Specification

Brand Sterlingbuild
Finish Clear
Material Polycarbonate
Operation Fixed
Shape Rectangular
Size (W x L) 70 x 100cm
Skin Thickness Double skin
Type Polycarbonate dome
Upstand 15cm
U-value 2.68 W/m²K
Ventilation Manual

Customer reviews

13 August 2018
Easy to install from diyer to tradeperson double skin window was suitable for replacement, good quality
20 December 2017
We have a conservatory with a solid roof which caused our kitchen to be rather dark. We placed a skylight over the kitchen window to bring light in. What a difference

Average Customer Review (5.0)