Frequently Asked Questions
Browse through these FAQs to find answers to commonly raised questions.
Your questions answered
What colours are Fatra membranes available in?
Standard colours are dark grey (RAL 7012) and anthracite (RAL 7016).
FF812 walkway membrane is light grey for contrast (RAL 7035).
What is the standard guarantee?
Our standard product guarantee is 20 years and our BBA certificate states a membrane durability of in excess of 30 years.
What certification does Fatra membrane hold?
Fatra manufactures high quality products that have been independently tested by the leading authorities in the UK. Whether for life expectancy, environmental impact, fire resistance or quality management, in every case Fatra membranes have provided outstanding results.
Please click here for further details on our approvals & accreditations
What is the fire rating of Fatra membrane?
Fatra membranes have been fire tested under CEN/TS 1187:2012 and classified in accordance with BS EN 13501-5:2016, achieving a BROOF (t4) rating for a variety of our most typical build-ups including:
- FF810 mechanically fixed membrane with 50mm, 200mm & 300mm of PIR insulation
- FF810 mechanically fixed membrane with 60mm & 300mm of mineral wool insulation
- FF807 adhered membrane with 50mm, 200mm & 300mm of PIR insulation
- FF807 adhered membrane with 60mm & 340mm of mineral wool insulation
BROOF (t4) is the highest classification for the external fire performance of a roofing system, indicating that a roof can resist fire penetration for at least 60 minutes and has limited flame spread. Using systems achieving BROOF (t4) means that there is no minimum distance required between adjacent buildings.
Can Fatra membranes be installed above existing roofs?
Refurbishing flat roofs in the UK requires a careful balance of technical assessment, regulatory compliance, and long-term performance. Many existing roofs are reaching their design life limit, and refurbishment is often more cost-effective than replacement. Fatra’s flat roof waterproofing solutions make refurbishment of existing roofs a viable option, including the overlaying of existing roof finishes.
Please click here for further details.
How do I become an approved contractor?
Please contact Fatra to arrange a training course and discuss further details. Please click here for further details on training.
Can I install a walkway on a Fatra roof?
Fatra provide a 650mm wide reinforced membrane designed for use as a slip-resistant walkway.
FF812 walkway membrane has a textured surface and is ideal for the demarcation of maintenance routes and should be installed in a contrasting colour to the main field area. FF812 is hot air welded to the finished Fatra roof and should not be used as a waterproofing layer in its own right.
How are solar panels or photovoltaic cells installed on Fatra roofs?
The Fatra integrated fixing point (IFP) is a proprietary mounting system incorporating a steel baseplate, a stainless steel connection plate and a factory fitted Fatra membrane flange which maintains the integrity of the waterproofing layer. Please contact us for further details.
Alternatively, if PV panels are to be ballasted, a loose-laid sacrificial layer of FF914 stafol protection membrane can be used.
If the PV system is fixed through the membrane and into the substrate, the support posts can be dressed in membrane as per a standard pipe penetration detail.
What fall is required for my flat roof?
British Standard 6229 recommends that all flat roofs, including gutters, should be designed with a 1:40 fall, to ensure that a 1:80 fall is achieved on the completed roof.
Is a wind load calculation required for my Fatra roof?
A wind load calculation should be produced for every Fatra mechanically fixed roof. This will determine therequired fixing centres.
Fatra wind load calculations for are carried out in accordance with the requirements of BS EN 1991-1-4:2005 Actions on structures – Part 1-4: General actions – Wind actions and are based on project specific post codes, grid references, building dimensions and roof height from ground level.
Can Fatra provide rainwater calculations?
Fatra can provide calculations indicating the area drained by a Fatra rainwater outlet. The calculations are carried out in accordance with BS EN 12056-3:2000 and use rainfall intensity charts for the geographical location of the site in conjunction with the flow rate of the specific outlet being used.