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The system comprises an underlayer and a capsheet used in conjunction with a vapour control layer in a warm roof construction. The Fatra Two Layer Felt System guarantees water tightness due to the homogeneous bonding of the felt’s bitumen throughout each layer.
Typical System Build Up
A) Substrate - Metal, Concrete or Timber
B) Primer - Fatra FF817 Primer
C) Vapour Control Layer - Fatra FF820 Torch On Felt VCL
D) Insulation Adhesive - Fatra FF867 Insulation Adhesive
E) Insulation - Bitumen coated glass-tissue faced rigid PIR insulation
F) Underlayer - Fatra FF819 Torch On Felt Underlayer
G) Capsheet - Fatra FF825 Torch On Felt Capsheet
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Felts |
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Product |
Roll Size |
Thickness |
Weight |
Rolls Per Pallet |
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Fatra FF825 Torch On Felt Capsheet |
1m x 8m |
4.0mm |
5.0kg/m² |
27 |
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Fatra FF819 Torch On Felt Underlayer |
1m x 8m |
2.5mm |
3.0kg/m² |
36 |
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Fatra FF820 Torch On Felt VCL |
1m x 16m |
2.0mm |
2.5kg/m² |
27 |
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Primers & Adhesives |
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Product |
Can Size |
Coverage |
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Fatra FF817 Primer |
25 litres |
6m² per litre (up to 150m² per can) |
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Fatra FF867 Insulation Adhesive |
6 litres |
5m² per litre (up to 30m² per can) |
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Fatra FF867C Insulation Adhesive |
18.5kg |
150m² to 200m² per canister |
Description: The Fatra FF825 is a torch applied capsheet with a charcoal black slate granular finish which provides great protection from membrane aging due to UV rays. The capsheet has a 75mm selvedge which facilitates bonding of the side laps. It consists of a special compound based on distilled bitumen which is modified with elastomers. This high content of polymer modified SBS is strengthened with 250g/m² linear-reinforced spun bond polyester. The reinforced modified bitumen blend assures good flexibility at low temperatures, excellent adhesion and great dimensional stability for use as a capsheet.
Product Make Up: Thermofusible film, SBS, 250g/m² polyester reinforcement, SBS, Slate Mineral Finish.
Description: The Fatra FF819 is a torch applied underlayer finished with a thermofusible film on both sides. It consists of a special compound based on distilled bitumen which is modified with elastomers. This high content of polymer modified SBS is strengthened with 190g/m² linear-reinforced spun bond polyester. The reinforced modified bitumen blend assures good flexibility at low temperatures, excellent adhesion and great dimensional stability for use as an underlayer.
Product Make Up: Thermofusible film, SBS, 190g/m² polyester reinforcement, SBS, thermofusible film.
Description: The Fatra FF820 is a torch applied VCL finished with a thermofusible film on the underside and a sanded finish to the upper-side. It consists of a special compound based on distilled bitumen which is modified with elastomers. This high content of polymer modified SBS is strengthened with 80g/m² linear-reinforced spun bond polyester. The reinforced modified bitumen blend assures good flexibility at low temperatures, excellent adhesion and great dimensional stability for use as a VCL.
Product Make Up: Thermofusible film, SBS, 80g/m² polyester reinforcement, SBS, Sand Finish.
Fatra’s aim is to provide innovative products backed with support from the initial design through to the completed roof. From the early design brief through selecting detailing and finishes to training the fitters and inspecting the installation, Fatra has a range of services tailored to the needs of each of those involved in the process. Fatra’s advice is linked with a commercial awareness of the implications of different design decisions as well as the latest regulations and technical advances.
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