Prolam PL8 H5 Posts

Built to perform, made to last
Prolam PL8 glulam posts are an engineered structural timber solution offering stand-out strength, dimensional stability and load carrying capacity. 
Manufactured from select quality New Zealand radiata pine and available in visual grades, PL8 posts are a smart and sustainable choice for contemporary residential and commercial builds where the natural beauty and enduring appeal of timber is a feature.

A cut above
• Solid strength and load carrying capacity
• High Dimensional stability (no twisting or warping)
• Available in a variety of sizes and lengths
• Custom sizing available
• Visual grade with a wide range of finishes
• No post brackets required
• FSC certified timber options available 

CodeMark Certified
The first and only engineered H5 timber posts CodeMark certified for strict building code compliance, Prolam posts are certified for above ground and in-ground structural use.

Prolam PL8 posts are ideal for:
• Pergolas
• Decks
• Entranceways
• Carports
• Gate posts
• Fence posts
• Supporting trellis
• Verandas
• Clotheslines

Click Here to view the full range of sizes and treatments.

Grades & Finishes

Visual - Appearance A

This grade is intended for use in applications where appearance of the member is important and clear or painted finishes are used. All surface voids are filled, small tight knots are permitted. The surfaces are planer machined to a high quality finish.


This is usually required in the visual grade, as it is used for its rustic visual appearance, the “roughness” of the bandsawn finish will vary as every saw will put a different finish on the product.


Sanded and Sealed

This is a premium finish added to a visual product, where all blemishes are filled, the whole product is sanded and then coated with a sealer that will protect the product from ingress of moisture for 6 weeks. This sealer is not a long term sealer. The product must be sealed for the long term as per our painting/sealing requirements.


This is a primary coat that is applied in our factory as a protective coat to stop ingress of moisture until the undercoat and top coats are applied. This primer coat is not to be used as the final finish and the product must be sealed for the long term as per our painting/sealing requirements.

Prolam structural laminated timber beams can be used in any form of construction where the structure relies on AS/NZS 1170: 2002 and NZ 3603 1993. The design can be from the Prolam online software, span tables or specific design by an engineer using Prolam’s structural properties. All structural timber products must be stored, handled and installed in accordance with all Prolam’s installation requirements. Prolam structural laminated timber works well in harsh environments, for example in corrosive chemical stores, fell-mongers, acid plants, salt-water environments and swimming pools, as it does not rust and the glues used are service class 3 certified.


Limitations on use

This laminated treated product must be protected from the elements until it is sealed, Prolam’s structural timber can be supplied with a temporary sealer if required. Timber naturally absorbs moisture from the surrounding environment. This can cause the product to alter dimensionally. All exposed structural timber must be sealed with a good quality paint or stain system within 14 days of delivery to dramatically reduce the incidence of dimensional change and increase longevity. All cuts, holes and rebates must also be sealed to prevent the ingress of moisture.

Prolam structural timber products can be used in specific fire performance situations and must be designed in conjunction with a fire engineer.

Building code statement of compliance 

Prolam structural laminated timber installed in accordance with the Prolam installation requirements will comply with the below performance clauses of the New Zealand 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); AS1170:2002 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 NZS3640. Prolam treats its own timber and is third-party audited to ensure compliance to the New Zealand treatment standard.
  • 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.

NZBC designed to comply



Protection from Fire

Hazardous Building Materials


Features & Benefits

Cost Effectiveness

High weight-to-strength ratio of Prolam allows for maximum loads over large spans with the smallest possible end sections.

Product Quality

Prolam manufactured in accordance with AS/NZS 1328 Glue Laminated Structural Timber standard.

Fire Safety

Extensive fire test data shows that Prolam beams maintain structural load support for measurable periods of time in fire situations.

Renewable Resource

Made from renewable New Zealand plantation timber, Prolam uses 14 times less energy to produce compared to the equivalent steel beam.

Chemical Resistance

Prolam works well in harsh environments as it does not rust and the glues used are service class 3 certified.