Tuesday, 10 April 2012

Rooflight dome glazing options.

At DVS we are absolutely passionate about daylight and we work very closely with architects to ensure the desired levels of daylight, solar protection, heat & noise insulation are achieved when specifying our rooflights.

Our F100 rooflights have such a comprehensive range of glazing options that we can always offer a solution to achieve even the most demanding specifications.

We offer our F100 rooflights with the following main glazing options:

  • Double layer domed glazing.
  • Triple layer domed glazing. 
  • Quadruple layer domed glazing.
  • Double layer domed glazing with 16mm 6-ply multi-wall polycarbonate.
  • Double layer insulation glazing (glass).

Each of these glazing options has its own unique attributes, and these are detailed below:

Double layer domed glazing:

Heat transmittance (glazing only) Ug: c. 2.6 W/m²K

Sound index Rw, P: c. 24dB

Light transmittance: c. 73%




Triple layer domed glazing:

Heat transmittance (glazing only) Ug: 1.9 W/m²K

Sound index Rw, P: 24dB

Light transmittance: 64%




Quadruple layer glazing:

Heat transmittance (glazing only) Ug: 1.6 W/m²K

Sound index Rw, P: 24dB

Light transmittance: 64%




Double layer domed glazing with 16mm 6-ply polycarbonate:

Heat transmittance (glazing only) Ug: 1.3 W/m²K

Sound index Rw, P: 24dB

Light transmittance: 40%




Double layer insulation glazing:

Heat transmittance (glazing only) Ug: 1.1 W/m²K

Sound index Rw, P: 38dB

Light transmittance: 78%




All of our domed glazing options can be supplied either clear or opal. We usually recommend opal glazing, as it provides a more evenly distributed natural daylight which is dazzle free. Rooflight domes have "self-cleaning" properties, mainly due to the excellent water run-off from the domed glazing, but opal glazing makes for an even lower maintenance rooflight as any (inevitable) dirt/debris is much less noticeable, particularly useful if the rooflight is being installed onto a roof with difficult or no access.

The quoted heat transmittance values above, relate to the glazing only and therefore do not reflect the overall thermal performance of the entire rooflight. We also supply fully verified total rooflight U-values which are calculated according to the internationally recognised standard EN ISO 10077-2:2009 and this takes into account the glazing, frame profile, the upstand and area to give the complete U-value of the product. For a  detailed explanation on rooflight U-values, please also read our news article: Uw - the value which really counts. Our triple layer F100 rooflight dome supplied with our 300mm high insulated upstand for a roof opening size of 1000x1000mm achieves a complete rooflight U-value of just: 1.1W/m²K refer to data sheet: F100 rooflight dome total U-value data-sheet.

Thanks for reading our article, for more information about our range of rooflights please refer to our website, email us or give us a call on 01284 749051.

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