Mk 8 Advance

MK8 Advance is exclusive in its ability to glaze an infinite length. It is manufactured to the same standards as our MK1 range using UV protected solid polycarbonate which has an exceptionally high impact strength and optical clarity, making it the ideal material for this product. As with the MK1 range of rooflights it can be manufactured in clear, bronze, opal or diffused polycarbonate or in any permutation of the various polycarbonate tints.

The MK8 Advance is easy to assemble and is designed to give maximum light and weather protection. It is made to measure in various widths up to 2400mm. Available as one of our standard products, it is typically manufactured in 1000mm modules with custom end sections designed to provide the required overall length. All sections are interlocking and therefore can be used to glaze a variety of expanses.



The modular design of this rooflight facilitates ease of delivery to site, distribution to roof level and installation. The thermoforming process produces a very cost effective product as no material other than the polycarbonate is needed during the manufacturing process.

Available in a Double, Triple or Quadruple skin construction it can be fitted to any of our UPVC kerb ranges in addition to being installed directly onto a timber or concrete builders upstand.

Constructed from a light weight but robust material it is designed to be user friendly and aesthetically pleasing with its low profile design, the MK8 is the natural choice to give maximum daylight on large projects. The introduction of additional skins helps to improve both thermal and acoustic insulation as well as reducing the possibility of condensation.

Our polycarbonate rooflights are all manufactured using a thermoforming process which has close similarities with vacuum forming except that greater use is made of air pressure. Each skin of the rooflight is manufactured individually and then combined to make the required rooflight. Each adjacent pair of skins are separated by a 20mm air gap to achieve the best possible thermal efficiency.

Our MK8 can comply with both Part L1 and L2 of the Building Regulations. It has exceptional impact resistance and has been vigorously tested by the Building Research Establishment (BRE) for non-fragility.

Polycarbonate (Solid Sheet)

UV protected polycarbonate offers high impact resistance as well as a variety of glazing options; clear, diffused, bronze and opal.


Single Skin 5.4 W/m²K As Installed
Double Skin 2.6 W/m²K As installed
Triple Skin 1.8 W/m²K As Installed
Quad Skin 1.4 W/m²K As installed

(additional laylight options available on request for increased thermal values)

Light Transmissions

Clear 87%
  • a high light transmission
  • allows full vision of views & objects
  • minimum privacy
Diffused 84%
  • a high light transmission
  • increased privacy
  • reduced glare and shadows
Opal 50%
  • a low light transmission
  • maximum privacy
  • reduced glare and shadows
  • prevents vision of views and objects
Bronze 50%
  • a low light transmission
  • reduced solar heat gain
  • cuts down the brightness of sunlight


Solar Gain

The solar gain (‘G’ value) can be improved to a more manageable level by way of introducing varying tint interlayers to the polycarbonate construction thus reducing the heat build up occurring from transmittance through the rooflight glazed area.


Security fixings with seala caps and washers are supplied with all MK8 Advance.

Fire Rating

Products comply with current UK Building Regulations covered under BS 476 and European Standards covered under BS EN 13501.


Manufactured in accordance with the harmonised standard BS EN 1873:2005 under the (CPR). All rooflights and kerbs manufactured and distributed from BBS premises covered under the regulatory standard will carry the CE mark giving greater confidence that the product being supplied is of the best possible quality and most importantly compliant to current legislation.


The ‘red book’ ACR(M) defines a test for non-fragilty which can be applied to any roof assembly to indicate whether the roof can support the loads imposed by a person falling or stumbling upon it. BBS have had their rooflights independently tested by the BRE to ensure they meet at very least a class ‘B’ rating.