HANDLING AND STORAGE
Store under covering, protecting the material from rain and excessive humidity. Boards should be transported in vertical position (edgeways), and must be handled carefully to avoid damaging the edges. To cut the board, first cut away the surface reinforcement mat on one side with a cutter, bend the board to break and then cut the reinforcement mat on the other side.
Before installation, the boards must be acclimated to environmental temperature and humidity. Temperature should be at least 5°C. The temperature should be between 5° and 40°C during filling and finishing works and for 24 hours after completion. Allow boards to dry thoroughly before mounting. Do not mount damp or wet boards.
All wall, double wall and false ceiling profiles must be in realised, as provided by UNI EN 14195, in cold-rolled steel hot coated with aluminium and zinc alloy (Aluzink) in accordance with UNI EN 10215. Profiles should have a thickness between 0.6 – 1.00 mm and positioned at a centre distance between 400 - 600 mm; the structure should be dimensioned according to the static requirements of the project and wind pressure. All fixing parts, accessories, nuts and bolts etc. should be resistant to aggressive environments, namely in stainless steel or treated to ensure resistance to salt spray (salt spray test) of more than 1.000 hours.
WATER-PROOF TRANSPIRING BARRIER
MGO Boards are resistant to water but are not waterproof; consequently, when they are used for outdoor vertical curtain walls an anti-condensation barrier consisting of a waterproof vapour-transpiring membrane, must be placed between the structures and MGO Boards. Fix the fabric temporarily to the structures from bottom to top, positioning the sheets horizontally and overlapping the edges of the different layers by at least 10 cm.
Install the boards horizontally (crosswise to the profiles) in staggered joints, with the rough surfaces turned outwards, then screw them to the metal framework with special highly corrosion resistant MGO Screws (Ruspert type treatment with salt spray resistance exceeding 1.000 hours) positioned at a maximum centre distance of 200 mm. Leave a space of 3-4 mm between the board edges, filling the space when the first coat of filling is applied.
The joints between the boards must be filled with the outdoor filler, MGO Filler Dry, which should also be used to finish the surface. Apply one 2-3 mm coating of filler interposing the alkali-resistant reinforcement tape; allow filler to dry then smooth off and finish.
Finish the surface with the same product MGO Filler Dry used to fill the joints, laying a coat of about 3 mm; bury the alkali-resistant glass fibre mat into the finishing coat, overlapping the edges by at least 10 cm. Wait for 24 hours, then apply the second finishing coat if necessary. Before applying any other finishing material, allow the finishing filler to dry and harden for at least 24 hours.
INSTALLING THE FINISHING PROFILES
Fix the PVC finishing profiles (edge beams, drips, expansion joint covers, cornices etc.) burying them into the mat on the finishing deck and overlapping the same over the edges of the alkali-resistant glass fibre mat. In particular cases, the profiles may be fixed to the metal sub-structure with the same screws used to fix the boards, or may be fixed to the boards with metal clips.
INSTALLING THE EXPANSION JOINTS
Expansion joints should be installed at every 6 m; joints should also be installed in the following cases:
- at the expansion joints of the building.
- at the floor division of the building.
- at points of variations of the materials of the structure or facing of the building.
The metal support framework should in any case be interrupted at the expansion joints.