Description

Soprema Roofing Membrane Systems are a range of double-layer, torch-applied fully bonded reinforced modified bitumen membranes for use on nominally flat or pitched roofs and decks.

Novaflex, Nova-SK and Polibit membranes are installed as double-layer systems on roofs with mineral chip or paint finish, and on decks with mineral chip finish and protected by a raised deck system. On concrete roofs and decks, the products are installed as a single-layer system and protected by paving slabs or screed. Novaflex, Nova-SK and Polibit membranes are supplied as torch-on or self-adhesive, reinforced, polymer-modified bitumen sheets in roll form.

Scope

1. Soprema Roofing Membrane Systems have been appraised as roof and deck waterproofing membranes on buildings within the following scope:

• the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with respect to building height and maximum floor plan areas; and,
• situated in NZS 3604 Wind Zones, up to, and including Extra High; and,
• the building is subject to specific structural design; and,
• a substrate of plywood on timber framing; or,
• a substrate of suspended concrete slab; and,
• with minimum fall for plywood roofs of 1:30, concrete substrates of 1:60 and all decks of 1:40; and,
• with deck size limited to 40m².

2. Novaflex, Nova-SK and Polibit Membranes have also been appraised for use as roof and deck waterproofing membranes on specifically designed buildings within the following scope:

• with building structures designed and constructed to comply with the NZBC; and,
• with roof and deck supporting structures of timber framing with substrates of plywood, cross laminated timber (CLT) or fibre cement sheets; and,
• with substrate of suspended concrete slabs; and,
• subjected to maximum wind pressures (refer to Paragraph 8.1); and,
• with the weathertightness design of all junctions being the subject of specific design by the designer. Note: The design of these junctions has not been assessed by BRANZ and is outside the scope of this Appraisal.

3. Roofs and decks waterproofed with Soprema Roofing Membrane Systems must be designed and constructed in accordance with the following limitations:

• nominally flat or pitched roofs and decks constructed to drain water to gutters and drainage
  outlets complying with the NZBC; and,
• constructed to suitable falls (refer to Paragraphs 13.3 and 13.4); and
• with no steps within the deck level, no integral roof gardens and no downpipes directly discharging to the deck; and,
• with the deck membranes continually protected from physical damage by pedestal protection system.

3. The design and construction of the substrate and movement and control joints is specific to each building, and are therefore is the responsibility of the building designer and building contractor and is outside the scope of this Appraisal.

4. The membranes must be installed by Equus Industries Ltd certified applicators.