The Great Bengal Felt ( Hessian/ FG) - IS: 1332:1993 type 3 Grade 1

The Great Bengal Felt (Hessian / FG)

The Great Bengal Felt (Hessian)is a high quality bituminous waterproofing core with Hessian as centre core.

It is produced by saturating the centre core of hessian with straight grade bitumen and then coating it further on both sides with straight grade oxidised Bitumen. Mica is then sprinkled on the bitumen on both sides to protect it from Ultra Violet rays and also to prevent adhesion.

The Great Bengal Felt (FG)

This has a fibreglass instead of Hessian Straight grade oxidised bitumen is used for impregnating and saturating the centre core of the fibreglass.

Both The Great Bengal Felt Hessian and FG are tested and tried waterproofing membranes and offer total impermeability to water. Both are easy to apply, easy to repair and maintain.

USES

Both are used for basement and roof waterproofing and many different types of surfacing such as:

: Concrete

: Asbestos / G I sheets

: Timber

: Shell / Folded plates.

They are ideal for waterproofing of silos, grain godown, warehouses, buses etc.

Application Methodology

Surface Preparation

- The surface should be thoroughly cleaned with wire brush.

- Repair cracks, if any.

- Apply Bengal primer on the surface

- Let the primer dry up. Then apply a coat of hot bitumen.

- Rolls of The Great Bengal Hessian Felt should be laid over the hot bitumen and pressed properly to avoid air gaps.

- A minimum overlap of Hundred mm and Seventy Five mm should be made at the ends and sides of The Great Bengal Hessian Felt respectively.

- For double layer treatment, the joints between the two layers should be staggered.

- A cement concrete fillet should be prepared at the junction of the roof and the parapet wall. The Great Bengal hessian Felt should be fixed in groove made in the parapet wall. The groove should then be filled with cement mortar (One by Four)

- The top coat of stone grit or gravel (Six mm size) should be laid by spreading hot bitumen and then laying the gravel over the bitumen.