Imper Torch applied waterproofing membranes

The Products in Brief

Imper Italia Paralon NT4 and ARD/HS are rolls of roof waterproofing sheet membranes which are manufactured from the same polymer-modified bitumen compound.

Paralon consists of bitumen compound 4mm thick reinforced with non-woven Trevira ® polyester fabric. Its upper side is unfaced but is treated with an silicate powder anti-blocking surface treatment.

Paralon ARD/HS Paralon consists of bitumen compound 4mm thick reinforced with non-woven polyester fabric, and faced on one side with coloured slate granules.

Granule facing colours available are Grey, Green, Black and Red.

The facing covers the whole sheet except for a 80mm wide strip running lengthwise along one edge. This is refered to as the selvedge. The underside is coated with a thermoplastic film called Termotene® which prevents “blocking” in the rolls. The selvedge is also covered with Termotene®.

Termotene® is a patented treatment (No.68751-A/77) consisting in the application of a thin film with a base of thermoplastic resins on the lower face of the waterproofing membrane, by means of a chemical physical adhesion process. While the prime purpose of the Termotene® treatment is to separate the coils of the rolls, it also acts as a powerful adhesive during the laying by torching, reducing LPG consumption by 50% and also allows the possibility to carry out spot bonding.

The polymer-modified bitumen base for Paralon NT4 and ARD/HS called Paralloy is manufactured by blending petroleum based bitumens, polypropylene thermoplastics (mainly atactic poly propylene) and small percentages of metallocenic resin and ethylene-propylene copolymer rubbers.

The Paralon membranes will resist wind uplift forces in excess of those applicable to buildings designed and constructed within the scope of NZ3604 and NZS 4229 for “high wind” exposures.