VMZINC Standing Seam Warm Roofing - Non-Vented Warm Roof System

Warm, non-vented standing seam roofing for compact roofs, structural roofs, standing seam roof on plywood bonded to phenolic foam, or standing seam roof on metal-faced panels.

Compact Roof:

• Non-vented warm roof system for buildings with high humidity levels using VMZINC Plus and a continuous support as a substrate.
• FOAMGLAS cellular glass insulation is adhered to the substrate using a cold adhesive; the staggered joints of the board are closely butted with the cold adhesive ensuring a vapour tight seal (no vapour barrier is required).

Features and benefits:

• Suitable for buildings with high humidity levels (including class 5, swimming pools).
• BBA certified – 12/4900 sheet 2.
• Almost no thermal bridges.
• Excellent pull-out resistance.

System build-up:

• Interior finish.
• Metal purlins.
• Continuous support e.g. steel deck or plywood.
• Cellular glass insulation e.g. FOAMGLAS.
• Galvanized steel plates.
• Bituminous membrane.
• Polyurethane separation layer.
• VMZINC PLUS Standing Seam.

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Structural Roof:

• Non-vented warm roof system for buildings with humidity classes between 1 and 4 using VMZINC Plus and an engineered panel as a substrate.
• The supporting structure can be a steel or plywood deck. Either deck is covered by Aludex Max (an aluminium foil-reinforced bituminous vapour barrier with a high water vapour resistance of 7000 MNsg) installed with cold or hot glued joints. All insulation materials must have a compression strength of minimum 50 kPa (0.5 kg/cm²), at a maximum 10% deformation and must be dimensionally stable at up to 100°C and comply with current Building Regulations.
• Between the VMZINC PLUS and the insulation, a VMZINC Membrane is fixed with an overlap that varies depending on the slope. The insulation material must also comply with the fire resistance requirements of the Building Regulations.

Features and benefits:

• BBA certified – 12/4900 product sheet 1.
• 100 year service life following BRE EPP EN 15804.
• Weather tight to wind and rain.
• Reduced thermal bridges.

System build-up:

• Interior finish.
• Rafters.
• Continuous support (e.g. steel deck or plywood).
• Aludex Max (fully supported vapour barrier).
• Insulation (e.g. mineral board or PIR).
• VMZINC Membrane.
• VMZINC PLUS Standing Seam.

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Standing Seam Roof on Plywood Bonded to Phenolic Foam:

• Non-vented warm roof system for buildings with humidity classes between 1 and 4 using VMZINC Plus and an engineered panel as a substrate.
• The substrate of the Metdeck/ Warmdex composite panels (on the warm side of the roof panel) must be covered with Aludex Max a continuous aluminium foil-backed bituminous self-sealing vapour barrier. Condensation risk must be assessed for each individual project or individual project component in accordance with BS 5250: 2002. Specification may need to be adapted to the internal humidity load of the building.
• The VMZINC Membrane should be installed between the VMZINC PLUS and the Metdeck/ Warmdex composite panels, then dressed into the gutter.
• Metdeck/ Warmdex composite panels, incorporating 18 mm WBP plywood factory-bonded to a Resol insulation core, are mechanically fixed to the substrate (vapour barrier on concrete, metal or timber deck). The number of fixings required will vary with specific building details and geographical location, and must be assessed on an individual basis.

Features and benefits:

• Metdeck provides a continuous support to VMZINC PLUS.
• Easy installation using traditional clips.
• Reduces thermal bridging.
• Timber substrate can resist limited foot traffic.
• Minimizes the number of fixings required.
• Excellent pull-out resistance.

System build-up:

• Interior finish.
• Rafters.
• Continuous support (e.g. steel deck or plywood).
• Aludex Max (fully supported vapour barrier).
• 18 mm plywood factory bonded to phenolic insulation.
• VMZINC Membrane.
• VMZINC PLUS Standing Seam.

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Standing Seam Roof on Metal Faced Panel:

• Non-vented warm roof system for buildings with humidity classes between 1 and 4 using VMZINC Plus and an insulated metal panel as a substrate.
• The insulated metal-faced composite panel must be made from galvanized steel on both the internal and external facing (minimum thickness 0.7 mm for external facing). Fixings and clips must not inhibit the required expansion and contraction of the VMZINC PLUS or cause any damage to the protective coating underneath.
• The insulated metal-faced composite panel must provide a 100% vapour barrier. This is normally achieved using a panel with a vapour tight interlocking jointing system.

Features and benefits:

• BRE EN 15804 EPD.
• This solution provides good pull-out resistance
• Offers a fast track installation process over large areas.
• Reduced thermal bridges.
• Allows building to be temporarily weatherproofed rapidly.

System build-up:

• Interior finish.
• Steel purlins.
• Insulated metal-faced panel (0.7 mm steel thickness).
• Aluminium-faced tape .
• VMZINC Membrane.
• VMZINC PLUS Standing Seam.

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VMZINC PLUS:

A product which allows zinc to be installed on ventilated plywood as well as specific warm (non-ventilated) substrates. The product consists of VMZINC (in all finishes) having a 60 µm coating applied to the underside thus allowing a more varied amount of substrates to be used and eliminating the risk of the formation of white rust on the underside of the zinc standing seam panels. VMZINC PLUS resists to an abrasion of 140 L when tested in accordance with ASTM D 968.

Life Cycle Analysis (LCA):

VMZINC undertakes Life Cycle Analysis (LCA) tests on its products and publishes Environmental Product Declarations (EPDs), such as BRE Environmental Profiles.

These provide users with comprehensive, reliable and transparent information on relevant environmental characteristics. The information is also used by VMZINC as the basis for its eco-design approach.