Description

Fatra Two Layer Felt System

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

Felts

Product

Roll Size

Thickness

Weight

Rolls Per Pallet

Fatra FF825 Torch On Felt Capsheet

1m x 8m

4.0mm

5.0kg/m²

27

Fatra FF819 Torch On Felt Underlayer

1m x 8m

2.5mm

3.0kg/m²

36

Fatra FF820 Torch On Felt VCL

1m x 16m

2.0mm

2.5kg/m²

27

Primers & Adhesives

Product

Can Size

Coverage

Fatra FF817 Primer

25 litres

6m² per litre (up to 150m² per can)

Fatra FF867 Insulation Adhesive

6 litres

5m² per litre (up to 30m² per can)

Fatra FF867C Insulation Adhesive

18.5kg

150m² to 200m² per canister

Fatra FF825 Torch On Felt Capsheet

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.

 

Fatra FF819 Torch On Felt Underlayer

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.

 

Fatra FF820 Torch On Felt Vapour Control Layer

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.

Resources

Drawings

Fatra Felt Standard Drawing Details

Download
Technical Datasheet

FF867 Insulation Adhesive

Download
Technical Datasheet

FF817 Substrate Primer

Download
Support & Services

Support & Services

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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FAQ's

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