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Technical FAQ's

From 1st July 2013 under the Construction Product Regulation 2011 (CPR) it is mandatory for manufacturers to apply CE marking to any of their products which are covered by a Harmonised European Standard or European Technical assessment (ETA). All roof windows are covered by this standard - EN 14351-1:2006+A1:2010. 

What makes your roof windows and rooflights different from others?

As a company founded by an architect, we are unique in understanding the wants and needs of architects. We appreciate the importance of aesthetics which is why our ranges are designed to complement a building's design and provide an unobtrusive finish when compared with other options on the market. You only need to look at ours to tell the difference.

All our ranges are made from mild steel which means they are extremely robust and have a long life span. Another advantage of using steel means that frames can be moulded into a variety of shapes, allowing the Rooflight Company to work with architects and specifiers on the most complicated of shapes and sizes. 

As a British manufacturing company we design and assemble all our roof windows and rooflights at our Oxfordshire factory. We are proud to be part of the British manufacturing industry. 

What is CE Marking?

CE marking is a manufacturer's declaration that an individual product conforms to the stated European harmonised standard(s) as directed under specific mandates from the EU, prepared by the European Standardisation Committee (CEN). CE marking is not a quality mark nor does it imply conformity with national building regulations/codes. 

The below roof window ranges are CE Marked:

  • The Conservation Rooflight®
  • The Conservation Egress Rooflight 
  • The Conservation Studio Designer Rooflight 
  • neo Steel
  • neo Fortecom®
  • The neo Steel Studio Designer Rooflight 
  • The Plateau Rooflight

What is the difference between a rooflight and a roof window?

The terms 'roof window' and a 'rooflight' are often interchanged. At the Rooflight Company we use 'rooflight' as an umbrella term for all of our ranges which provide natural top-lighting. However, in accordance with EN 12519:2004 - Windows and pedestrian doors - terminology, a European standardisation definition for 'roof window' is show below.

"[A] window intended for installation in a roof or the like which is inclined. Roof windows have the same characteristics as windows installed in walls with regard to function, cleaning, maintenance and durability."

If the products' intended end-use application has the same characteristics as a window, and the product is installed at an inclination; then that product can be considered a roof window according to the definition within EN 12519:2004. 

The definition of 'rooflight' is not contained within EN 12519:2004. 'Rooflights' themselves can take numerous forms from pitched pyramidal structures to horizontal units capable of being walked-on. It is within the scope at the beginning of each harmonised European standard that the definition and intended application for the 'rooflight' type is confirmed.

What are the maximum allowable u-values in the latest building regulations?

*1: Exception: Where the replacement windows are unable to meet the requirements because of the need to maintain the external appearance of the façade or the character of the building, replacement windows should meet a centre pane U-value of 1.2 W/m2K.

*2: Exemption: Buildings which are; Listed in accordance with section 1 of the Planning (Listed Buildings and Conservation Areas) Act 1990; In a conservation area designated in accordance with section 69 of that Act; or Included in the schedule of monuments maintained under section 1 of the Ancient Monuments and Archaeological Areas Act 1979; Carports.

*3: Exemption: Buildings which are; Listed in accordance with section 1 of the Planning (Listed Buildings and Conservation Areas) Act 1990; In a conservation area designated in accordance with section 69 of that Act; or Included in the schedule of monuments maintained under section 1 of the Ancient Monuments and Archaeological Areas Act 1979; Used primarily or solely used as places of worship; Stand alone buildings with floor area less than 50m2; Carports; Temporary building with a planned time of use less than 2 years.

Do your rooflights and roof windows comply with the latest building regulations? 

Yes, our roof windows and rooflights comply with the latest Part L building regulations. 

Can I specify/use roof windows without having to do a complex calculation for building regulations?

Yes. As the ranges fall within the building regulations requirement it can be used without complex heat loss calculations, as long as the area of windows, doors and rooflights to an extension or new building is no greater than 25% of the total floor area. This proportion can be increased but a more complex ‘balancing' calculation between the areas and U-values of the floor, walls, roof and windows/doors/rooflights would be required to show compliance with the Regulations. Lower U-values in some elements can be used to balance higher U-values in others, or permit an increase in the area of windows/doors.

What is the guarantee period for the Rooflight Company Products?

Please use the tables below for the guarantees offered by the Rooflight Company (terms and conditions apply). 

Roof Window Range  Glass Frame
The Conservation Rooflight® 5 years 12 years 
neo Steel 5 years 12 years
neo Fortecom® 5 years 10 years
The Plateau Rooflight 5 years 12 years

 

Rooflight Range Glass Frame
The Pyramid Rooflight         5 years  12 years 
The Polyedge Rooflight 5 years 12 years
The Lantern Rooflight 5 years 12 years
The Walk on Rooflight 5 years 12 years
The Added Security Rooflight 5 years 12 years 
The Secured by Design Rooflight 5 years 12 years


How much do your roof windows and rooflights weigh?

Each rooflight size and type has a different weight. The weights of each model can be found on the sizes and prices pages of this website or in the brochures. Click here to request a brochure. 

How do you support your rooflights?

All our roof windows for pitched roofs are supported directly on, and fixed to, roof joists. The sizing and spacing of roof joists is frequently a matter of what is given by the existing structure in instances where rooflights are installed to existing roofs. In new roofs the roof joists can be optimised or placed so as to facilitate ease of rooflight installation.

In all instances the sizing of the roof joists to support roof windows should be advised by, or checked with, a structural consultant such as structural engineer. 

Flat rooflights are supported on up-stand kerbs with the exception of the Walk on Rooflight. For information about the Walk on Rooflight please contact us. 

What do the size dimensions of your roof windows and rooflights mean?

When supplying a customer with a quote our technically-trained team quote using the structural widths and lengths. The structural dimension is the clear opening that is required within the roof structure in order to install your roof window or rooflight. 

If required the viewable dimensions for all models can be found on the sizes and prices pages of the website or in our brochure. 

What roof pitches are your roof windows and rooflights suitable for?

Model  Minimum Pitch Maximum Pitch
Roof Windows

The Conservation Rooflight® 17.5 65
The Conservation Egress Rooflight 17.5 65
The Conservation Studio Rooflight

17.5

65

neo Steel 20 60
neo Fortecom® 20 70
The Plateau Rooflight 3 20
Rooflights    
The Added Security Rooflight Horizontal Horizontal
The Lantern Rooflight Horizontal Horizontal
The Pyramid Rooflight Horizontal Horizontal
The Polyedge Rooflight Horizontal Horizontal
The Walk on Rooflight Horizontal Horizontal

If the roof window or rooflight you would like falls outside of the pitches above please contact our customer services team on 01993 833108 who will be able to advise you.

Performance and Quality 

Roof Windows 

Roof Window Range CE Marked Standard *Whole Window u-value
EN ISO 10077-2:2012
Centre Pane u-value
EN 673:2011
Weathertightness

Air Permeability 

Watertightness Resistance to wind loads
The Conservation Rooflight® EN14351-12006+A1:2010 1.5Wm2 1.2Wm2 BS6375-1:2009 Exposure Category 2000 EN 1026:2000 Class 4  EN 1027:2000 Class E1050 EN12211:2000 Class 5
neo Steel EN14351-12006+A1:2010 1.4Wm2K 1.0Wm2K BS6375-1:2009 Exposure Category 2000 EN 1026:2000 Class 3 EN 1027:2000 Class E1050 EN12211:2000 Class 5
neo Fortecom® EN14351-12006+A1:2010 1.3Wm2K
1.1Wm2K BS6375-1:2009 Exposure Category 2000 EN 1026:2000 Class 2 EN 1027:2000 Class E1050 EN12211:2000 Class 5
The Conservation Egress Rooflight EN14351-12006+A1:2010 1.4Wm2K 1.0Wm2K BS6375-1:2009 Exposure Category 2000 EN 1026:2000 Class 3 EN 1027:2000 Class E1050 EN12211:2000 Class 5
The Plateau Rooflight EN14351-12006+A1:2010 1.4Wm2K 1.0Wm2K BS6375-1:2009 Exposure Category 2000 EN 1026:2000 Class 4  EN 1027:2000 Class E1050 EN12211:2000 Class 5
Studio Conservation Rooflights® EN14351-12006+A1:2010 1.4Wm2K 1.0Wm2K BS6375-1:2009 Exposure Category 2000 EN 1026:2000 Class 4  EN 1027:2000 Class E1050 EN12211:2000 Class 5
Studio neo Steel  EN14351-12006+A1:2010 1.4Wm2K 1.0Wm2K BS6375-1:2009 Exposure Category 2000 EN 1026:2000 Class 4  EN 1027:2000 Class E1050 EN12211:2000 Class 5

*Values given for the smaller of the two standard windows defined in EN 14351-1 (size: 1.23m wide x 1.48m high; vertical orientation).

If you require another copy of the declaration of performance for the rooflight you have bought please contact our customer services team on 01993 833108 quoting the product serial number.

Rooflights

Rooflight Range CE Mark Standard  Whole Window u-value Centre Pane u-value
The Walk on Rooflight n/a 1.3Wm2K 1.0Wm2K
The Pyramid Rooflight n/a n/a 1.2Wm2K
The Lantern Rooflight  n/a n/a 1.2Wm2K
The Polyedge Rooflight n/a  n/a 1.2Wm2K

If you require another copy of the declaration of performance for the rooflight you have bought please contact our customer services team on 01993 833108. 

Are metal roof windows and rooflights susceptible to condensation like metal windows?

All our roof windows and rooflight models have been fitted with our unique Thermoliner® which allows condensation to be controlled by draining it through small drainage holes in the cill of the baseplate.

Do you provide flashing kits?

Flashing kits are suitable for pitched roof windows and can be used with most tile types. Please see our flashing kit page or contact our customer services team on 01993 833108 for more information. 

Do your roof windows and rooflights have trickle vents?

Due to the winding device used our rooflights and roof windows, many of them can be classed as a trickle vent product.

How do you clean your rooflights and roof windows?

Please contact our customer services team for more information about cleaning your rooflight or roof window. 

Can you roof windows and rooflights be specified in different colours?

Yes, roof windows and rooflights can be manufactured in any available RAL colour. Please note this does affect lead-time and cost. For more information please contact our customer services team. 

What are your payment terms?

We accept most credit and debit cards for full settlement in advance of our roof windows and rooflights. Payment can also be made against a Pro Forma invoice. A VAT invoice can be issued upon request.

Alternatively the Rooflight Company products can be purchased from major builders merchants.

Where can I find your terms and conditions?

Terms and Conditions can be downloaded by clicking here.