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 unrivalled for durability in the New Zealand market today.

  • Wide & Long Rolls .JM comes in 3m x 30m rolls
  • Highest Thickness-Over-Scrim in the Roofing Industry.  TPO attribute for top performance
  • Exceptional Ozone Resistance. JM building scientists worked with our polymer chemists to understand and apply breakthroughs in chemistry that have allowed us to utilize the industry’s best UV formulation. The JM TPO formulation was developed to maximize resistance to ozone degradation
  • Seam Strength 50% Higher Over a Wider Temperature Range. 
  • Highly Engineered for Tear Strength and Uplift Resistance. JM TPO is strong and flexible, helped by the scrim orientation and thickness of our polyester reinforcement.
  • Thickness Tolerances Have Over 50% Less Deviation than Other Major Brands. JM measured 10' wide sheets from other brands at 105 data points across the width of the membranes. 
  • Highly Engineered for Tear Strength and Uplift Resistance. JM TPO is strong and flexible, helped by the scrim orientation and thickness of our polyester reinforcement. 
  • Outstanding Climate Resistance as Measured by the Xenon Weatherometer. The ASTM test minimum standard is simulated exposure at 10,080 kJ/m2 . JM has maintained performance now to 19,800 kJ/m2 and continues to accumulate exposure well past the ASTM requirements. 
  • durability
  • externalMoisture


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 between 1.150 (1:50) 2.30 - 1.150 (1:25), or gutters at with a 0.5° (1:100) fall:

• H3.2, CCA treated structural plywood

• In situ reinforced concrete

• Pre-fabricated concrete panels

In conjunction with a drainage system, providing the rainwater flows to

An outlet that complies with the NZBC

B1 Structure (complies with)


B1.3.3 (a), (b), (c), (e),

(f), (g), (h), (I), (m), (o),

(p) & (q)

B1.3.4 (b), (c), (d), (e)

B2 Durability (complies with)

B2.3.1 (b), 15 years

E2 External Moisture (contributes to)



E2.3.7 (b) & (c)

F2 Hazardous

Building Materials (complies with)


The JM TPO Cool Roof Solution is a system that must be designed and

installed specific to the building project. The design of the system requires

the selection of all components applicable to the project.

Campbells Bay Early Learning Centre

When Adrian Rowan, from award-winning Auckland building business 505 Construction wanted to create a beautifully crafted and engaging space for young children to play in, he sought out Allco Waterproofing Solutions to supply crucial waterproofing systems and to input expertise.


Allco Concrete Substrate Checklist


Allco Plywood Roofing Substrate Checklist


JM TPO Installation Guide


JM TPO Warm Roof


JM TPO Warranty Request Form


JM TPO Cool Roof


JM TPO Warm Roof Solution




JM TPO Cool Roof

Product Datasheets

JM One-Part Pourable Sealer

JM TPO Datasheet


JM Single Ply Caulk

JM Single Ply Primer Low VOC

JM Single Ply Primer Low VOC

JM TPO Edge Sealant

JM TPO Membrane Bonding Adhesive

JM TPO Membrane Cleaner

JM Energy 3.E - Inherently Fire Resistant Polyisocyanurate


Branz Appraisal - JM TPO

Features & Components

JM Vapor Barrier - Features & Components


JM One-Part Pourable Sealer Features and Components


JM EPDM Seam Tape Plus Features and Components


JM Dynaply T1 Features & Components

JM Flat & Tapered Energy Features & Components

JM Flat & Tapered ENRGY3 - Roof Insulation



JM DEXcell CEMENT ROOF BOARD - Cement & Glass Mesh Cover


JM DensDeck Prime Roof Board - Glass Mat Faced Gypsum

JM Invinsa PlusRoof Board - Scrim-Reinforced Facer High Density Polyiso

JM Ultrafast Plates - Galvalume Metal and Locking Plastic Plates

JM High Load Pre-Assembled Fasteners & Plates - Roof Membrane Fastener

JM All Purpose Fasteners - Roof Membrane and Insulation Fasteners

JM Roofing System Urethane Adhesive

JM TPO Water Based Membrane Adhesive

JM 3 Oz Polyester SlipSheet

JM TPO Safety Walkpad

JM Single Ply Sealing Mastic

JM TPO 6" Reinforced Termination Strip

JM TPO Membrane Cleaner

JM TPO Membrane Primer

JM TPO Pipe Boots

JM TPO Edge Sealant

JM TPO Cover Tape

JM TPO T-Joint Patch

JM TPO Universal Corners

JM TPO Detail Membrane

JM TPO Coated Metal

JM TPO Penetration Pocket

JM Single Ply Caulk


JM TPO Walkpad


JM Membrane Bonding Adhesive (TPO & EPDM)

Safety Datasheet

SDS ALLCo JM Membrane Bonding Adhesive oct 2017

SDS ALLCo JM One-Part Pourable Sealer october 2017

SDS ALLCo JM Single Ply Primer oct 2017

SDS ALLCo JM TPO Edge Sealant oct 2017

SDS ALLCo JM TPO Membrane Cleaner oct 2017

SDS ALLCo Single Ply LVOC Caulk Oct 2017

SDS Allco Sure-weld TPO Bonding Adhesive June 2016 MSDS

Installation Instructions

JM Roofing Sytems - Urethane Adhesive - Installation Instructions