New BRANZ Appraised Screw System For Weatherboard Installation

Until now, the NZBC has stated that nails are the only solution for weatherboard fixing. This system can be time-consuming with multiple steps for the builder, and comes with the inherent issues that nailed solutions often encounter (damage to the back of the board, and fastener pull as the board expands and contracts).

Now BRANZ has appraised the Quik Drive screw system and Simpson Strong-Tie Trim Head collated screws for weatherboard fixing.

These 7G 305 grade stainless screws come in two lengths (65mm and 75mm) and install via the Quik Drive PRO300 screw gun. Not surprisingly, screw testing by BRANZ has revealed stronger hold than nails, which resists fastener pull out, making the structure stronger and reducing the risk of call-backs for the builder.

Installing these via the Quik Drive System allows the builder to accurately set and control countersink depth (no more running back through and punching nails), and the weatherboard clip removes the need to mark out the height and ensures the fastener never grabs the board below.

The trim head leaves a small hole for subsequent filling, and dramatically reduces damage in the back of the board meaning less risk of moisture ingress over time, making this the ideal solution for builders and cladding crews.

Trim Head Exterior Timber Screw (Collated & Loose)

Simpson Strong-Tie

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Simpson Strong-Tie Stainless Steel Trim Head screws are ideal fastners for many exterior timber applications, including weatherboards, window and door facings, boxed corners and even aluminium window and door jambs.

Suitable for NZS 3604 extra high wind zones:

Weatherboard cladding
Window Trims, Boxed Corners, Door Jambs
Timber cladding
Timber-to-timber
Wall cladding

In the opinion of BRANZ (Appraisal No. 1044[2019]) Simpson Strong-Tie Weatherboard Screws, if designed, used, installed, and maintained in accordance with the statements and conditions of this Appraisal, will meet or contribute to meeting the following provisions of the NZBC:

Clause B1 STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4. Simpson Strong-Tie Weatherboard Screws meet these requirements for loads arising from self-weight, wind and impact [i.e. B1.3.3 (a), (h) and (j)]. See Paragraphs 8.1 to 8.3.
Clause B2 DURABILITY: Performance B2.3.1 (b), 15 years and B2.3.2. Simpson Strong-Tie Weatherboard Screws meet these requirements. See Paragraphs 9.1 to 9.3.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. Simpson Strong-Tie Weatherboard Screws contribute to meeting this requirement. See Paragraph 10.1.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Simpson Strong-Tie Weatherboard Screws meet this requirement and will not present a health hazard to people

See also Producer Statement by Southern Pine Products

Installation Manual (Page 8) - by Clelands Timber

Producer Statement - by Niagara Sawmilling

BRANZ Appraised

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