FrameLumen Conservation rooflights are manufactured from Zintec steel. The electro-zinc coated steel sheet and coil, offers a number of advantages over ordinary uncoated mild steel. Zintec's corrosion resistance protects the steel in transit, in storage, during the production process, and in the finished product. The Zintec sheets are punched to 0.2mm tolerance and then folded by a computer controlled press brake.
The frames are then MIG (Metal Inert Gas) welded. MIG welding is an automatic or semi automatic process in which a wire connected to a source of direct current acts as an electrode joins two pieces of metal, as it is continuously passed through a welding gun. A flow of an inert gas is also passed through the welding gun at the same time as the wire electrode. This inert gas acts as a shield, keeping air borne contaminants away from the weld zone. All welds and edges are dressed by hand to insure a high standard of finish.
Lumen Evo rooflights are manufactured from CR4 steel with a PZ770 paint specification for corrosion protection. The principal protection is due to the zincs encasement of the item, which prevents contact with the environment.
Due to the risk of standing water our Lumen Planus (flat) rooflight is manufactured from grade 316 stainless steel as it contains an addition of molybdenum that gives it improved corrosion resistance. This is particularly apparent for pitting and crevice corrosion in chloride environments. Due to it hardness it is difficult to punch so all 316 parts are laser cut to 0.25 mm tolerance. All folds are undertaken by a computer controlled press brake to ensure both consistency and accuracy.
PaintOur 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.
Paint standardsISO 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.
The Evo rangeBenefits from the protection offered by the Chromadex PZ770 system.
Rooflight Material - Mild Steel CR4
Surface Preparation - Steel Shot Blast
Paint Process - Zinc Rich Primer, 330 Primer, Top Coat
This provides the Evo with a protection to first maintenance of:
C4 Environment - 12 Years
C5 Environment - 6 Years
Glass and Safety
|Glass and Safety Documents|
TestingLumen Conservation and bespoke rooflights to the conservation design comply with BS6375 Part 1: 2004 for weather performance.
Air Permeability +/- Class 4 up to 600 Pa
Watertightness 600 Pa Class 9a (no leakage)
Wind Resistance Class E2500 P1
Overall Class CE2500
P1 - 2500 Pa
P2 - 1250 Pa
P3 - 3750 Pa
Personal ServiceWe believe that not only does the product have to be of the highest standard but also the service that we provide to our clients. As with the product, we don't make any wild claims about our service. We are not simply box shifters and all the team has a genuine interest in both the products and our clients projects.
We all take great pride from helping produce products that fit your requirements and add value to your home. We are happy to discuss your requirements, provide images, technical detail and can supply quotations from your drawings.