Description

The Sika Index Roof and Deck Membranes are for nominally flat, pitched and curved roofs, decks, gutters and parapets.  They are installed as torch-on, two-layer systems with a top layer finished with mineral chip.  They can also be installed as single layer onto concrete substrates with traffic protection such as paving slabs or topping screed.  The products are reinforced, APP, SBS and SBS/APP polymer-modified bitumen sheet in roll form. 

Scope

Sika Index Roof and Deck Membranes have been appraised for use as waterproofing membranes for buildings within the following scope:

• the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1; or,
• the scope of limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area when subject to specific design; and,
• with substrates of plywood or suspended concrete slab; and,
• with minimum falls for roofs of 1:30 and decks of 1:40; and,
• with deck size limited to 40 m²; and,
• situated in NZS 3604 Wind Zones, up to, and including Extra High.

Sika Index Roof and Deck Membranes have also been appraised for use as waterproofing membranes for external reinforced concrete and plywood roofs, pedestrian decks and balconies for buildings within the following scope:

• subject to specific structural and weathertightness design; and,
• with substrates of plywood or suspended concrete slab; and,
• situated in specific design wind pressures up to a maximum design differential ultimate limit state (ULS) of 6 kPa; and,
• with the weathertightness design of junctions for each specific structure being the responsibility of the building designer.

Roofs, decks and balconies waterproofed with Sika Index Roof and Deck Membranes must be designed and constructed in accordance with the following limitations:

• decks and nominally flat or pitched roofs constructed to drain water to gutters and drainage outlets complying with the NZBC; and,
• with no steps within the deck level, no integral roof gardens and no downpipe discharging directly into the deck; and,
• with the deck membranes continually protected from physical damage by a pedestal protection system.

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

The membrane must be installed by Sika (NZ) Ltd approved applicators.