• Residential, light commercial and light industrial buildings with raked or mono-pitched ceilings.
• Designed for specific wind zones and seismic loading per AS/NZS 1170, including snow loading where applicable. 
• Suitable for open-plan and pavilion-style layouts where NZS 3604 bracing walls are not viable.
• Treatment specified to suit the exposure zone, from H1.2 for interior applications through to H3.2 for exterior.
• Portals fall outside the scope of NZS 3604 and are designed under NZS 3603.

Each portal is designed for a specific project and must not be relocated, resized or reused on another project without re-engineering. Substitution of any member changes the design and voids the PS1.

All members must be installed strictly in accordance with the issued design and connection details. No drilling, notching or rebating unless specifically detailed by the design engineer.

Timber must be protected from the elements until sealed, and all exposed members sealed with a quality paint or stain system within 14 days of delivery. All cuts, holes and rebates must be resealed.

Fixings must be selected for the corrosion environment in accordance with NZS 3604 Section 4. Requires building consent.

Designed and installed in accordance with the issued Prolam design documentation, the Prolam Raking Portal will meet or contribute to meeting the following provisions of the NZ Building Code.

• B1 Structure: B1.3.1, B1.3.2, B1.3.3 (a, b, f, j, m, q), B1.3.4 (a, b, c, d, e). Designed to NZS 3603 and AS/NZS 1170. Manufactured to AS/NZS 1328.1 and AS 5068.
• B2 Durability: B2.3.1 (a), B2.3.2. All timber treated in accordance with NZS 3640.
• C Protection from Fire: C6.3, C6.4. Char rate per APA Evaluation of Char Rate (ASTM E119), TT-118, January 2015.
• F2 Hazardous Building Materials: meets the requirements of F2.3.1. All timber is treated in accordance with NZS 3640, including the required flash-off period before dispatch. Prolam treats its own timber and is third party audited for compliance with the New Zealand treatment standard. Safety Data Sheets for treatment chemicals are available on request.

A Producer Statement PS1 is issued with each Specific Engineering Design.

Prolam has been supporting architects and construction professionals for 20 years to design and build with strength, confidence and ease with premium engineered timber solutions.

• Glulam construction provides dimensional stability, resisting the twisting, cupping and shrinkage associated with solid sawn timber.
• Timber sourced from renewable and sustainably managed New Zealand plantations. FSC certified options available under FSC-C181652.
• Lower thermal conductivity than steel portal equivalents.

Design Service

How the SED Raking Portal design to delivery service works

Prolam’s Raking Portal solution supports both Prolam-led Specific Engineering Design (SED) and collaboration with project structural engineers.

Where the project engineer is undertaking the SED, Prolam can assist with structural timber expertise, modelling data and defined connection detailing.

Alternatively, Prolam’s engineering team can develop the portal design and documentation to support building consent.

1. Either COMPLETE the Design Request form (optional) or email through any available project details (e.g. spans, pitch, loads, and site location)

2. SAVE AND EMAIL the completed form (if used) along with building plans to Prolam's technical team. If further information or clarification is required, the engineering team will be in contact.

3. RECEIVE a quotation for the Specific Engineering Design (SED). Once accepted and the design invoice PAID, structural drawings and connection details are prepared for REVIEW AND APPROVAL. 

4. Prolam ISSUE the finalised design package, including supporting documentation for building consent. A COST ESTIMATE for manufacturing the portal will also be received. 

5. PLACE an order once building consent has been approved. 

Prolam MANUFACTURE AND DELIVER the prefabricated Raking Portal kitset to the nominated timber merchant.