A Specifiers Guide to Rooflights - Blog

While the benefits of rooflights are clear, such as being a great source of ventilation, providing high levels of natural light they also contribute to the thermal comfort of your building.

Skylights also provide an aesthetically pleasing addition for the external appearance of your property.

But what are the considerations to ensure the specification runs smoothly when it gets to site? Rooflights from Natralight are generally easy to install but knowing what to expect prior to installation will ensure things go smoothly.

In this blog, we will discuss how proper specification will keep on-site work progressing as expected.  

Window Size for Rooflights

Rooflights come in a number of shapes and sizes and choosing the right dimensions for your project is very important. 

A 'standard' roof window is 900x600mm which are installed between rafters at 600mm centres. Another common size is 980x980mm plus 900x1200mm with the latter designed to fit in a double-rafter space. Rooflights are also available in larger sizes, on request. 

Structural Support 

The best way to support a rooflight is by using double trimmers for horizontal support and double rafters for vertical support. Double hangers will also be placed in each corner with single hangers located around connected rafters. 

The double support comprises of two pieces of rafter timber with 600mm centres. The rafters will be fixed together with bulldog timber connectors and M12 bolts. 

When fixing the timber, the head of the bolt will be recessed on the side of the wood to which the skylight will be fixed. Otherwise, it may protrude into the area beneath the glass. 

For structural requirements, relevant calculations will be carried out by a qualified structural engineer.

Rooflights Available Now From Natralight

If you would like to know more about rooflights, contact Natralight today. All of our prospective customers receive a no-obligation quote for all of our products.

To get a better idea of the quality of our work, read some of our Case Studies including some high profile installations across London.