Shop - JM TPO





Reliable and cost-effective, JM TPO is a versatile waterproofing membrane suitable for a wide range of roofing installations including:

– Low slope roofs

– Cold roof systems

– Warm roof systems

– Decks and balconies

– Green roofs

– Ballast roofs

– Water collection

Allco JM TPO is a state-of-the-art TPO (thermoplastic polyolefin) roofing membrane. JM TPO is a reliable and cost-effective single-ply roofing membrane, reinforced with polyester fabric and manufactured using ultraviolet ultraviolet resistant formulation allowing extreme pliability, flexibility, and weldability during installation.

JM TPO is ideal for waterproofing membranes for a wide variety of new substrate surfaces or for rejuvenating failed worn-out existing membranes which are nearing their “use by date”.

Allco JM TPO is manufactured by Johns Manville (JM), one of the most respected and technologically advanced waterproofing membrane manufacturers in the world. JM was founded over 160 years ago and is a proud member of the Berkshire Hathaway family of companies, servicing customers in more than 80 countries globally.

Allco JM TPO is suitable for commercial and residential low-slope and pitched roofs, gutters, parapets, balconies, and under-floating decks.

JM TPO is also used as the waterproofing membrane on our ALLTHERM Warm Roof, ALLRITE Recover Roof, and Cold Roof solutions.


Allco JM TPO has undergone rigorous testing and is certified as a suitable waterproofing membrane for water collection.

Designed with durability in mind, Allco JM TPO has been engineered with a reinforced fabric scrim layer combined with a more substantial top-ply thickness, providing long-term weathering and UV resilience properties, along with high-strength tear and puncture resistance making it ideal for New Zealand’s harsh weather and UV conditions.

When durability and peace of mind is paramount, it is vital that you can trust the waterproofing system engineered to protect your home or investment from the elements. That is why we have selected JM TPO and its proprietary accessories as the ultimate solution for your low slope, pitched roof. Boasting the most substantial thickness over scrim available; Allco JM TPO goes unrivaled for durability in the New Zealand market today.


Allco supply the JM TPO Cool Roof Solution for use within the following

Scope: Designed, specified and installed in accordance with all Allco documentation.


In wind zones:

• Up to and including Extra High as defined by NZS-3604:2011.

• Where specifically designed up to (ULS) 3.0kPa.

In all climate zones as defined by NZS-3604:2011.


On new buildings that have been designed and constructed to comply with the NZ Building Code (NZBC), particularly B1 (structure) as it relates to the construction of the substrate and substrate framing and E2.3.1 (surface water run off) as it relates to the shedding of water. On existing buildings where the designer and applicator have ascertained that the existing building is suitable for the intended building work.

On the following substrates that incorporate a slope or gutters at with a 0.5° (1:100) fall:

• H3.2, CCA treated structural plywood

• Reinforced concrete


For more information please refer to our JM TPO Branz appraisal.

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