Home >> Faq >> Installing Rooflight
Question:

We have been advised that we might require planning permission for installation of a conservation roof window. Please can you advise.

Answer:

We would always advise that you check with your local authority before installing Lumen conservation rooflights. There are many factors that will decide whether you are granted permission to use rooflights and if your property is Listed or in a Conservation Area you may find restrictions concerning the type of rooflight that is allowed. Fortunately, the Lumen range of conservation rooflights replicate a traditional Victorian pattern. In addition the low profile design will ensure that your Lumen rooflight will sit flush with your roofline.

Question:

You provide lots of different sizes, which ones do I need?

Answer:

We provide a range of sizes in our literature and on our website. The most commonly used size for installation is the "Internal Rafter" dimension. The width dimensions are critical as the fixing lugs are located on the sides of the rooflight however, we do provide around a 55mm tolerance in the quoted internal rafter. This gives the installer an option with the plasterboard. Quite often the installation involves the plasterboard being boxed around the rooflight. However in certain applications the winder may snag on the plasterboard at the bottom of the rooflight thus reducing the distance the winder can open the casement. If your rafters are particularly deep and this is likely to happen, it might be necessary to fit the bottom section of plasterboard at an angle. Providing the tolerance in our internal rafter height makes this process easier. If you do not wish to taper the plasterboard, you can simply add an additional timber piece across the head or cill to fit tight against the rooflight liner. As the end user, you will need to pay attention to the clear viewable size as this is the dimension you have upon completion of installation. These sizes are provided from the internal face of the American oak liner. The overall size is, as you would expect, the size of the complete rooflight. Please remember that much of the outer frame is covered by your slates or tiles, leaving an unobtrusive low profile rooflight in your roof. Should you require any sizing information prior to ordering or installation, please call us on 0845 050 8746.

Question:

Do you manufacture frameless rooflights?

Answer:

Our Lumen range includes the low profile conservation rooflights, the more contemporary EVO and our bespoke range.

Although all our roof windows offer a superb glass to frame ratio they do have an outer framework or silicone coating. This is to protect the Pilkington double glazed units from possible failure.

Double glazed units are manufacture from two pieces of glass which are separated by a spacer bar running around the four sides. Our rooflight units are also filled with argon gas. Pilkington require the spacer bar to be covered and protected from UV light. If left unprotected the spacer bar will fail and moisture will get between the two pieces of glass which is when a unit starts to mist up.

Lumen offer a lifetime guarantee on all our Pilkington units and we closely follow the recommendations and guidelines they set out. If we were to offer a roof light with edge to edge glazing we would not be able to offer the lifetime guarantee on the units.

We will continue to work with Pilkington to develop our rooflight range whilst maintaining the high standards our products offer to our customers.

If you have any questions concerning our glazing specifications or options, please call us on 0330 300 1090.

Question:

Do you have any advice concerning rooflights in a coastal location?

Answer:

We produce the rooflights to the very best of our ability. As such we are proud to offer our customers an exceptional guarantee. Whilst the guarantee gives assurances about our commitment to you and the quality of the product, there are some exemptions. Firstly the location of your property is very important. Our zintec rooflights are treated with an Interpon APP120 primer before the application of a Cromadex Extra Life coating system for C3 Environment. As well protected as our products are the harsh salty environment of a costal location is likely to result in the faster deterioration of the protective coating and ultimately the metal. As such we do not recommend installation of our standard range in coastal regions or areas which are subject to a corrosive or polluted environment. If your property is located in one of these areas, please talk to us about our range of paint options or stainless steel rooflights. As with almost all exterior building materials, you should undertake regular maintenance to ensure that the product continues to work efficiently. We supply a copy of our guidelines with the order but please contact us on 0845 050 8746 should you require additional copies. Paint standards - ISO 12944 Paints & Varnishes - Corrosion Protection of Steel Structures by protective paint systems (parts 1-8) (1998) ISO 12944 Classification C3 = Urban and industrial atmospheres. Moderate sulphur dioxide levels. Production areas with high humidity C3 definition of coastal is less than 5000 metres from the sea.

Question:

Are Lumen rooflights supplied with a flashing kit?

Answer:

The Lumen range of conservation style rooflights require a traditional installation by a professional roofing contractor.

Question:

We will be installing Conservation style rooflights into our Georgian farmhouse and wondered how we would ventilate the rooms.

Answer:

Our stock range of Lumen rooflights have opening casements. Each rooflight is supplied with a beautifully crafted winder mechanism that is available in either brass or chrome. These winders will push the opening section out to a maximum of 300mm. As you are able to control exactly how far the rooflight opens you can have as little or as much ventillation as you like.

Question:

We have very old rafters on our cottage that vary considerably in depth and width. Would your rooflight be able to be used, or adapted to enable us to provide additional light into our loft space.

Answer:

The Lumen rooflight has fixing lugs that position onto the side of the rafter and therefore the width and depth are not that important providing you are not leaving the rafter exposed. In most situations, the internal area is covered by plasterboard and therefore covers the rafters. The most important measurement is the distance between the rafters. On occasions where rafters cannot be altered it might be necessary to manufacture a bespoke rooflight using the Lumen Extra Light system.

Question:

We are going to be installing new skylights into a listed barn, it has a fairly shallow catslide roof on one elevation. Would the Lumen Conservation Rooflight be suitable for this application.

Answer:

Lumen conservation stock sized rooflights can be used from a minimum pitch of 17 degrees to a maximium of 70 degrees.
Installation into lower than 17 degrees may cause issues with removing water from the outer frame area, particularly in a pantile roof. Although it is unlikely that water will enter through the casement, there is a risk that water will pool at the foot of the rooflight where the frame and lead meet. The rooflight frame must not be submerged for long periods and it is vital that the pitch of the roof allows a suitable run off. We do not recommend installtion below 17 degrees but should you choose to install our product below this pitch, please ensure that you consult your roofing contractor prior to installation. We do offer a range of rooflights for flat roof installation.

During opening hours

(08:30-17:00 Monday-Thursday & 08:30-16:00 Friday)

Telephone: 0330 300 1090 (local rate)

General Enquiries

Brochure Request

Quote

Out of office hours

General Enquiries

Brochure Request

Quote

Live Chat

Click to chat or if we are currently offline leave us a message

Lumen Rooflight
3 RMD Business Units, Holsworthy Industrial Estate
Holsworthy EX22 6HL United Kingdom
Tel: 0330 300 1090
Tel: 01409 255120

© Lumen Rooflight