My quotation is showing an External Manufacturing Size, what is this?
This is your External Kerb Size plus 30mm. This gives leeway to ensure the rooflight fits the timber upstand perfectly. We can also provide you with a rooflight quotation based on your finished clear viewable sizes if required.
What is a Thermally Broken frame?
Thermal breaks are polyamide strips which separate the aluminium to boost thermal efficiency. Structural insulating Polyamide Strips have been utilised for thermally breaking aluminium extrusion assemblies for over 30 years. Strips are available with a variety of configurations, to meet differing performance requirements. Creating a thermal break using a Polyamide Strip system involves a number of steps. Firstly a knurling wheel is used to produce “teeth” between 0.15 mm and 0.30 mm long in a pocket of the inner and outer extruded profiles that will be joined by the Strip to comprise the frame. These “teeth” will bite into the Strip during the crimping process and insure adequate shear strength for the composite profile. Then the Polyamide Strip is pulled or pushed into the extrusion profile, using specialised equipment. Finally three sets of wheels rotate the extrusion onto the Strip and mechanically lock the components together. Over 1300 pounds of pressure is applied in stages, and the resulting aluminium/strip assembly will then act as a load-bearing composite. Shear testing is typically conducted periodically to verify that the process has produced an assembly that will perform structurally as required.
The Polyamide Strip reduces heat transfer through the aluminium and helps to stop condensation and heat loss. It is important to check when comparing rooflight products and prices as there are some skylights and rooflight systems out there are just made of a single piece of aluminium and these are unlikely to have genuine thermal testing results as they are not thermally efficient.
Is there a difference between tested and a calculation?
Calculations purely estimate the U-value of a rooflight are although this provides a guide to thermal performance it is not accurate. Calculations can be manipulated in favour of a particular outcome. NuDawn rooflights and glazing solutions have been tested through a government accredited testing facility giving real and accurate U-values so you can reply on the information provided.
Some companies use hot melt units whereas NuDawn only use silicone. What is the difference?
UV rays breakdown hot melt sealed units, so we use only silicone sealed units in our rooflights and skylights as they do not degrade under UV rays. Silicone sealing is a more expensive process but it lasts much longer and out performs standard hot melt. This is why silicone sealed units are mostly used in structural glass applications.
Is there a maximum size flat rooflight and what if my rooflight is too large for one pane of glass?
Our maximum size of rooflight is dependent on the weight of the finished product. We are a small UK rooflight manufacturer so we do have limits on the weights we can safely lift and move around the factory. The bigger the rooflight, the thicker the glass and as the glass thickness increases, so does the weight. You will also need to consider how you will unload the rooflight from the delivery vehicle and lift it into position on your roof. If your skylight is too heavy for a single pane then the glass can be split into smaller sections with the design of a glass beam or a structural beam that the glass is bonded to. This allows you to make much larger rooflights with the ease of transportation and installation without the need for costly lifting equipment. A popular choice for narrower rooflights, is a structural glass to glass join for a more ‘Frameless’ look. Rooflights which are spit into a number of sections are supplied in kit form for onsite assembly.
What’s the difference between glass to glass joins and the usual bars you find in standard lanterns and pyramids?
Replacing bars with structural glass to glass joins means we can achieve better U-values, keep the Lantern and pyramid designs more thermally efficient and maximise natural daylight with much thinner hips and ridge. Not only does a frameless lantern or pyramid perform better but it offers your project a more aesthetically pleasing and neater product.
What’s the maximum size glass unit thickness that can be used in our glazing systems?
Flat Rooflight = up to a 45mm unit
Roof Lantern & Pyramid = 30mm unit only
Opening Rooflight = up to a 36mm unit
Balustrade = 17mm Toughened Laminate
Can we install your rooflights, skylights and glazing products?
NuDawn are a supply only company so we are not able to provide an installation service. However, our products are straightforward to install and we provide kerb details ahead of order so you can prepare your kerbs well in advance.
Can I install your Rooflights onto any roofing substrate?
Yes, this is not a problem just as long as the rooflight is being fitted onto a timber upstand, and the correct sealant is applied to the substrate.
What’s the minimum and maximum pitch for your Rooflights?
Flat Rooflight = 5 – 45 degrees
Opening Rooflight = 5 – 15 degrees
Roof Lantern = 0 degrees / flat only
What is the pitch of the frameless lantern and pyramid products and can it be changed?
Due to our purpose made thermally broken aluminium extrusions, our lantern and pyramid rooflight design is set at a pitch of 40 degrees and this cannot be changed.