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Areas of application
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Roofs with a pitch from 3° to vertical. |
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Classes of internal humidity load: 1 to 4. |
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Both renovations and new buildings. |
VM ZINC®, the choices
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Characteristics of this technique
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VM ZINC® is installed on the roof boarding. |
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A 40 mm continuous air gap must be left clear beneath the roof boarding, on all the roof pitches. |
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Continuous ventilation openings are made at the top and bottom. |
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In order to keep the integrity of the roof, it is recommended to install a breather membrane on the cold side of the insulation and a vapour control layer adapted to the internal humidity load of the building, on the warm side of the insulation. |
Structure
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Clean and dry 100 to 150 mm wide, 18 or 24 mm thick softwood boarding, according to the rafter centres. |
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Any wood treatment products (fungicides, insecticides) must be dry and completely neutral in relation to VM ZINC®. |
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The roof boards are fixed perpendicular to the direction of the pitch leaving a 3 to 5 mm gap between them.
They are securely fixed to the structure. |
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Maximum difference in height of 1 mm between roof boards.
The deflection measured under a rigid 600 mm long straight edge cannot exceed 2 mm in all directions. |
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The roof board nails are countersunk in order to avoid any contact with the VM ZINC®. |
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In case of incompatible support (e.g. plywood), one should use only VM ZINC® PLUS. |
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