Description

Crommelin Under-tile Exterior Waterproofing Membranes are liquid-applied waterproofing membranes for use under ceramic or stone tile finishes on external decks and balconies.

The products included in this appraisal are:

• Wetite®.
• Shower Waterproofing Membrane.
• Termidry Waterproofing.

Scope

1. Crommelin Under-tile Exterior Waterproofing Membranes have been appraised for use as deck and balcony waterproofing membranes for buildings within the following scope:

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

2. Decks and balconies must be designed and constructed in accordance with the following limitations:

• with the membrane continually protected from exposure to ultraviolet (UV) light and from physical damage by ceramic or stone tile finishes; and,
• with no steps within the deck level and no downpipes discharging directly onto the deck.

3. Movement and control joints in the substrate must be carried through the membrane and tile finish. The design and construction of the substrate and movement and control joints is specific to each building, and is therefore the responsibility of the building designer and building contractor and is outside the scope of this Appraisal.

4. The ceramic or stone tile finishes are outside the scope of this Appraisal.

5. The membranes must be installed by trained installers, approved by The Trustee for B & C Crommelin Family Trust.