Weather Secure – continuous roofing sheets with no end laps or joins which rely on sealant; the slotted roof rail and fastening system negates the use of long fasteners through the roof sheet that would flex due to thermal expansion.
Breathes – slotted roof rail design allows the required amount of air movement to control moisture resulting in lower moisture levels than other systems year round, removes the need to rely on a vapour barrier and reduces the risk of moisture accumulating sufficiently to cause corrosion of the roof sheet.
Insulates – consistent R-Value across the roof, reliable for the life of the roof; fastening system reduces energy loss from thermal bridging.
Aesthetic – your choice of roof profile including Dimondek 630 clip-fastened roof sheets in continuous lengths up to 90m*.
Straightforward – easy to install to Building Code requirements using the Metal Roofing Code of Practice; building is closed in quickly enabling sequencing of sub-trades to be optimised. Easy to maintain as the roof sheet can easily be replaced if damaged without disturbing the insulation.
For NZ – designed in New Zealand specifically for the rigors of New Zealand’s environment. New Zealand Building Code compliant to clause E2/AS1 and H1.
Warranty – 15 year system warranty.
The next generation in roofing is available today, specify Tricore on your next commercial roofing project.
The Case for Ventilation vs Vapour Barrier
In any insulated roof system the surface on the inside of the insulation is maintained close to the internal air temperature and the moisture in the air will therefore not condense on the inside surface. However, when the warm air migrates past the internal surface and through the insulation it will eventually reach a surface that is cool enough to cause the moisture in the air to condense. Accumulation of this condensation will reduce the effectiveness of the insulation and will cause long term issues with the durability of the insulated roof materials.
Vapour Barrier as a Solution
A vapour impermeable layer can be installed below the insulation to prevent the warm inside air from migrating anywhere. However, reliance on a vapour barrier solution is not recommended because no vapour barrier is 100 percent reliable since there will be laps in the material, fastener holes and also penetrations for services and lighting.
Ventilation as a Solution
Given that some warm internal air will migrate through the insulation it is sensible and essential to provide ventilation within the system that will allow any condensation that forms to dry out. Condensation moisture adjacent to the roof underside can result in corrosion of the roof sheet, and to prevent this it is essential that the moisture is removed. Modelling of climatic conditions shows that a relative humidity in excess of 90% can occur under the roof sheet for up to 8 months of the year unless adequate ventilation is available. It is known that prolonged exposure to Relative Humidity greater than 90% causes premature corrosion of the underside of steel roof sheets.
The Tricore Solution
Tricore has a partial vapour barrier in the form of the profiled steel lining sheet. It is accepted that some warm internal air will migrate through laps in the lining sheets and through fastener holes.
The Tricore system includes a high quality roof underlay positioned on top of the insulation with sealed laps that permits transfer of water vapour but prevents condensation moisture from passing through to the insulation below.
The Tricore Roof Rail is positioned above the PIR insulation board and the roof underlay to create an air space immediately below the metal roof sheet.
Hence when condensation forms on the underside of the roof sheet (or in extreme cases possibly on the top surface of the underlay) it will be directly exposed to air movement in the air space and will dry out rather than accumulate. The air movement is facilitated by the design of the roof rail to allow sufficient air movement from eaves to ridge. The ventilation is driven by both air pressure difference between eaves and ridge and thermal buoyancy within the air space.
The Tricore insulated roof system uses high quality Enertherm PIR rigid insulation in a range of thicknesses that can be selected to achieve the required thermal resistance.
High quality Enertherm PIR with tri-laminated aluminium foil facing to both sides, with minimal shrinkage over time
– Large panel sizes can be used minimising the risk of loss of R value due to gaps at joins
– Density : 32 kg/m3
– Compression Strength : at 10% deformation ≥ 175 kPa (EN 13165)
– Fire Rating: Class E (EN13501 Part 1). FM approved for use wirh a roof deck construction to Class 4450 - 27 Mrch 2009
Available as square edge
Complies with EN13165 for thermal performance
* Based on PIR only without the additional R value from surface effects and additional Tricore components.
The Tricore system is fastened to the structure in a way that minimises the effect of fasteners penetrating the insulation and ensures that the roof fasteners on the cold roof side of the assembly only penetrate as far as the ventilated roof rail and therefore do not form a thermal bridge to the warm internal side.
Similarly, the ventilated roof rail is located on the cold side of the insulation, which forms a continues separation from the warm support structure.
The quality of the Enertherm PIR rigid insulation is such that shrinkage of the panels does not occur to any extent that would result on gaps opening up between panels over time.
Tricore details have been developed to ensure that the thermal envelope is continuous at gutter lines and ridge.
The potential for condensation to form within the Tricore system is minimised by the use of a combination of vapour barriers and air space ventilation.
The NPM 900 lining sheet forms a partial vapour barrier beneath the Enertherm PIR insulation. Consideration of a range of internal and external climate conditions has been carried out using WUFI computer modelling to ISO 13788, including NIWA data over a 1 year period for both Auckland and Queenstown environments.
Results indicate that the Dew Point will be on the roof sheet underside or on the roof underlay on the top surface of the PIR insulation, and therefore the Tricore system has been designed to provide a ventilated air space between the roof underside and the roof underlay. The ventilation that can then occur in the air space acts to prevent a build up of moisture and relative humidity against the roof underside. This prevention is critical to the durability of the roof material.
The WUFI analysis showed that a system without the ventilated air space immediately below the roof sheet could expect to have a relative humidity in excess of 90% for up to 8 months of the year, whereas the Tricore ventilated system could expect a relative humidity below 90% and thereby minimise the risk of roof sheet underside corrosion .
Prefinished Lining Sheet
NPM 900 profile in Zincalume or ColorCote finish if left exposed as visible lining, available in 0.40, 0.55 or 0.75 mm steel thickness to suit purlin spacing and construction loads.
Pan-fixed to purlins to achieve rapid enclosure of the building.
†Based on fastening every second pan of all sheets on all purlin lines.
Slotted Roof Rail
Enables free flow of ventilation air and drainage of any moisture that may be present.
Ventilated air space ensures moisture accumulation is removed from the underside of the roof sheet. Given this, Relative Humidity at the roof sheet underside is not expected to exceed 90%. By comparison, an insulated roof build-up that does not have a sufficiently ventilated space below the roof sheet could be expected to have a Relative Humidity at the roof sheet underside exceeding 90% for up to 8 months of the year, creating a significant risk of roof sheet corrosion.
Ensures that any leakage at the roof fastener is managed by the roof underlay, preventing fastener leakage entering the PIR.
Enables the roof fasteners to be separated from the fasteners that penetrate the warm side of the system.
Galvanised steel to provide sufficient screw holding fastened through the PIR board and into the structural purlin at 300mm centres.
Roof Sheet and Underlay
Choice of long run profile, with no end laps or reliance on sealant to achieve weather security, including clip fastened Dimondek 630 to remove fastener penetration of the roof sheet.
Proven load/span data for each roofing profile based on product testing and history of use.
Underlay is supported by the PIR boards and absorbs any moisture present below the roof sheet, releasing it to drying air in the ventilated space below the roof sheet.
Need a brochure for one of our roofing profiles? Here you can download one for each of our profiles with the basic information and details you need during the decision process.
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