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How secure are Polycarbonate Roof Domes?

For domestic and commercial installations, roof domes provide robust security measurements. The high-security screwbolts that are utilised with our rooflights come supplied as standard with all dome products we provide on our website. During the installation process (which we provide full fitting instructions in a step by step fashion), the fixings cannot be removed using common tools that thieves would look to utilise to gain access. This ensures that a high level of resistance to tampering, making it even more difficult for forced entry.

Polycarbonate Rooflight Performance

Thermadome rooflights are manufactured from high quality polycarbonate with insulated PVC kerbs suitable for fitting directly to the roof deck. They are designed to make optimum use of natural light and are offered in a wide range of sizes. They are not ventilated to provide a cost effective natural light solution. This means that our domes are expected to exceed the natural light of the roof covering (felt / single ply etc) and will not be effected by any atmospheric pollution that occurs nor rust through the products lifetime. All of our products come with full manufacturer guarantee's for extra peace of mind, ensuring against any defective design.

Thermadome Polycarbonate Domed Rooflight un-ventilated with PVC kerb     in a wide variety of options. A versatile offering a wide range of possibilities when installed on your property. Achieving a fantastic and high level of natural daylight through your flat roof, our dome comes in a wide range of sizes, roof opening sizes and finishes. Special features include;

  • Wide Variety of Skin Types
    Available in both Triple and Double Skins
  • Lots of Sizes Available
    A wide variety of Roof Opening Sizes available.
  • Finishing Types
    Available in Clear or White Opal Diffused
  • Security fixings
    Included for added and extra security. 

Our Thermadome product is a fantastic, well rounded polycarbonate skylight allowing home owners the peace of mind with added extra security benefits and thermal insulation via a broad range of skin types and thicknesses. 

Delivery to mainland UK only in approximately 1 - 3 working days

For measuring informaion please click here.

Manufactured from white uPVC and clear or diffused polycarbonate which offers:

- UV protected polycarbonate.

- insulated 150mm high PVC upstand supplied as standard.

- White security fixings (supplied) provide a high level of resistance to forced entry.

- Impact tested under current BS EN 1873 to pass classification of SB 1200.

- Complies with BS 476 fire rating.

- Sound reduction of 22dB for a triple skin dome.

- When combined with a double skin dome, the complete unit achieves U Value of 2.38 W/m²K

- When combined with a triple skin dome, the complete unit achieves U Value of 1.93 W/m²K.

- Kerb foot size for double skin units 70mm

- Kerb foot size for triple skin units 100mm


All Rooflights, curbs and accessories must be stored on a flat dry surface under cover prior to fixing. Rooflights should be stored on edge, not stacked horizontally and protected from the rain. Rooflights should not at any time be left in direct sunlight until installation is complete. Heavy items should not be placed on top as this can lead to damage or distortion.

Drill and securely fix curb to roof aperture through the bottom flange, 100mm from each corner and at maximum 300mm centre’s. Use very large headed fixings (not supplied), type and size as dictated by site conditions. Upstand curbs should be fixed to a structural component (i.e. not fixed through insulation). The 150mm high curb should not be fitted below roof insulation. The 300mm high curb can be used with roof insulation up to 150mm thick (unvented) or up to 60mm thick (vented). If fitted with insulation in excess of the above recommendation a timber ground 75mm wide x required thickness should be provided around the roof aperture.

Evenly position rooflight on to the waterproofed upstand or frame. Securely fix the rooflight using security screws* supplied. For PVCu, GRP or timber no pilot drilling is required. Do not overtighten. Install anti burglar cap. Locate the coloured weather cap onto the black screwbolt body then press the coloured cap downwards very firmly to fully locate (when correctly located a distinctive click will be heard). * For fixing to existing upstands other than timber (e.g. Concrete) Use fixings with an appropriate plug (not supplied). However, because site conditions are clearly beyond our control, it is the contractors responsibility to ensure fixings give adequate hold to existing upstand. If in any doubt, contact your supplier.

For installation details please click here

Thermadome polycarbonate domes are manufactured from enhanced polycarbonate that will not show excessive changes in colour or loss of light transmission, nor will they break due to loss of impact strength, due to weathering, within 10 years from the date of sale.

Please click here to read our full Terms & Conditions of Sale.

Thermadome Polycarbonate Dome Rooflight Fixed PVC Kerb


£245.59 Ex VAT




Rotating trickle vents
+ £73.59
Yes No

£294.71 Inc VAT

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