Rafter Beams by Techlam NZ

Rafter Beams

Description

Lightweight, strong and aesthetically pleasing, laminated timber is far superior to solid timber, with stability and consistent structural properties key benefits. Laminated timber beams are also a simple method of construction, requiring no specialist building skills, unlike steel. Standard dimensions are typically 100-900mm in depth and 42-270mm in thickness; however larger dimensions are readily achievable, due to the flexibility of the manufacturing process.

The length range available is generally only limited by transport – beams up to 27m are quite possible. Beam strength grades available – GL8, GL10 and GL12. Typical uses range from pergola rafters right up to large clearspan warehouses and sheds.

Scope of Use

Techlam laminated timber posts and beams can be used in all forms of construction where the structure relies on AS/NZS 1170: 2002. The design and use must be in accordance with Techlam specifications, design criteria and selection tables.

Limitations on Use

Techlam Glulam products are supplied with one coat of temporary sealer applied. To preserve the aesthetics of the product, it should be further sealed with a high quality primer and two full coats of premium enamel or acrylic topcoat within 14 days.

All cuts and notches, holes and rebates must be sealed with protective coating to prevent shrinkage and swelling. All exterior timber products must be kept dry and protected from excessive heat, direct sunlight or prolonged exposure to the elements. Where specific fire performance is required Techlam laminated timber posts and beams must be designed in conjunction with a fire consultant.

Statement of Building Code Compliance

If installed in accordance with the Techlam installation requirements, Techlam laminated posts and beams and Techlam structural laminated flooring will comply with the performance clauses of the Building Code:

Structure B1/AS1: meets the requirements of B1.3.1, B1.3.2, B1.3.3 (a, b, f, j, m, q) B1.3.4 (a, b, c, d, e); AS 1170:2002 for engineering span tables; AS/NZS 1328:1998 and AS5068 for building element.
Durability B2/AS1: meets the requirements of B2.3.1(a) B2.3.2. All timber is treated in accordance with NZS 3640. Techlam does not carry out this treatment, Techlam relies upon its suppliers as they are all third party accredited.
Protection from Fire C: APA Evaluation of Char Rate (ASTM E119), TT-118, January 2015; meets the requirements of C6.3 C6.4. Where members are required to have a fire resistance rating the designer can use the following standards for FRR design: TT-118 OR: NZS 3603:1993 (section 9).
Hazardous Building Materials F2/AS1: meets the requirements of F2.3.1. Timber treatment suppliers meet NZS3640, which includes flash-off requirements.