Prolam PL12 H5 Posts

Stronger by design
Manufactured in New Zealand from quality, sustainably grown pine, PL12 glulam posts are built to perform and made to last.
Engineered for a superior fit and optimal strength and design flexibility, PL12 Glulam Posts are available in visual grades, with increased bracing units, dimensional stability and load carrying capacity – reducing the number of posts required.

PL12 Glulam Posts are the ultimate choice for a wide range of building applications – from stand-out features like pergolas, decks and entrances to fences, gate posts and more.

A cut above
• Solid strength and high load carrying capacity
• High dimensional stability (no twisting or warping)
• Fewer PL12 posts required compared to PL8 posts
• Available in a wide range of sizes and lengths
• Custom sizing available
• Visual grade with a wide range of finishes
• No post brackets required
• Manufactured from sustainably grown timber. FSC options available.

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

Prolam PL12 glulam posts are ideal for:
• Pergolas
• Decks
• Entranceways
• Carports
• Gate posts
• Fence posts
• Supporting trellis
• Verandas
• Alfresco areas

Check our FAQ H5 Laminated Posts page here.

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-monger, 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 tempoary sealer if required. Timber naturally absorbs moisture from the surrounding environment. This can cause the product to alter dimensionally. All exposed structral 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 increases 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 conjuntion with a fire engineer.

Building code statement of compliance 

Prolam structural laminated timber installed in accordance with the Prolam installation requiements, 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 it’s 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 follow 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.