Protect the Line of Liability with Cavibat

The introduction of cavities was designed to protect the structural component of buildings. As per the building code E2/AS1, on one side of the cavity is the structural framing with a 50 year durability requirement. On the other side of the cavity is the cladding with a durability requirement of 15 years. So where does the 35 year gap in durability protection start and finish?

According to cladding appraisals, the cavity batten is included with the cladding specification. So the line of liability must be where the cavity batten meets the building wrap.

So where in the makeup of the cavity is the moisture barrier to protect the framing? Normally, the first thing builders do when they put down framing on a concrete slab is install a moisture barrier. So why is the same level of protection not also given where there is porous moisture-absorbing cladding? If a timber batten is utilised there is no moisture barrier and the timber can absorb and transfer moisture across the cavity.

Cavibat Cavity Battens are manufactured from polypropylene. Polypropylene is a moisture barrier and the life expectancy of polypropylene is greater than 50 years. The Cavibat system utilised with most claddings can provide superior cavity durability protection for the life of buildings throughout New Zealand.

Cavibat Cladding Batten

Cavibat

View Product

Cavibat Cladding Cavity Batten is an extruded fluted batten designed for use as a non-structural cavity batten in cavity-based wall cladding systems on timber-framed buildings.

Cavibat Cavity Battens have been appraised for use as non-structural cavity battens for use with non-structural wall cladding systems on timber framed buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1; and,
with a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1, Table 2; and,
with cavity-based wall cladding systems complying with NZBC Acceptable Solution E2/AS1 or a valid BRANZ Appraisal that specifies a nominal 20mm (minimum 18mm) drained and vented cavity; and,
situated in NZS 3604 Wind Zones up to, and including Extra High.

Cavibat cavity battens are compatible with the following cladding product types:

wood-based
cement-based
fibre cement
polystyrene-based
metal
uPVC
kraft paper-based or synthetic building wraps

In the opinion of BRANZ, Cavibat Cavity Battens if designed, used, installed and maintained in accordance with the statements and conditions as stated, will meet or contribute to meeting the following provisions of the NZBC:

Clause B1 STRUCTURE: B1.3.1, B1.3.2 and B1.3.4. Cavibat Cavity Battens meet the requirements for loads arising from wind and impact.
Clause B2 DURABILITY: B2.3.1 (b), 15 years and B2.3.2. Cavibat Cavity Battens meet these requirements.
Clause E2 EXTERNAL MOISTURE: E2.3.2. Cavibat Cavity Battens when used to form a drainage cavity behind a cladding system will contribute to meeting this requirement.
Clause F2 HAZARDOUS BUILDING MATERIALS: F2.3.1. Cavibat Cavity Battens meets this requirement and will not present a health hazard to people.

Cavibat Cavity Battens have been tested to E2/VM1 and are an acceptable solution in terms of weathertightness performance in accordance with NZBC Acceptable Solution E2/AS1. Cavibat Cavity Battens are an alternative solution in terms of New Zealand Building Code compliance for all other provisions of the NZBC.

Structure

Durability

External Moisture

Hazardous Building Materials

BRANZ Appraised

Categories

Popular Products

Popular Brands

Features

Sections

This Month

A Groundbreaking Urban Waterfall Made Possible With Dekton by Cosentino

Timber-Edged Switchgear Completes the Look for Scandi Style Home

A Weather Resistive Barrier Solution for Rainscreen Claddings

SECTIONS

Considering Thermal Insulation for Concrete Block Walls

Good Product Information is Key to Helping Make the Consenting System Work Better

Determining the Best Coating Method for Timber Decking