Cutting Marvec sheets can be cut with hand or power tools. Hand saws with fine tooth blades e.g. metal cutting blades, are suitable. When cutting a Marvec sheet ensure that it is not under any stress and that it cannot vibrate. Support the sheet close to the saw and cut at a shallow angle with slow steady strokes.
	Drilling Holes must not be punched through Marvec sheet. Hand and power drills are suitable. Drill holes at a slow speed when using a power drill. Use a masonry bit and support the sheet underneath the hole position to avoid vibration. Fixings should be at least 50mm from the end of the sheet.
	Hole Size To accommodate thermal movement, holes for fixings should be drilled 6mm greater in diameter than the fixing shank for sheet lengths up to 2m and an additional 3.5mm per additional metre length of sheet. For example, in a 4m long sheet, holes should be overdrilled by 13mm. Failure to accommodate thermal movement will cause buckling of the sheet.

INSTALLATION

The following general guidelines should be following when installing Marvec sheeting:

1.      Ensure that any wood preservative used on supporting timber sections is thoroughly dry.

2.      The faces of purlins and any other section over which the Marvec is laid must be painted white. Where Marvec sheets lap over any other material, e.g. corrugated metal, the section of the metal that will be under the Marvec should be covered with a reflective aluminium tape. This helps reduce the possibility of distortion of the Marvec due to heat build up. All accessory materials should be light in colour, preferably white.

3.      Roof pitches must be a minimum of 5^o (87m rise per metre) to avoid ponding on the roof.

4.      Never nail or rivet the sheet. Always use the recommended fixings and drill holes as instructed to permit thermal movement. The minimum number of fixings required across each profile should be as illustrated in the fixings section below. On eaves purlins and when structures are exposed to strong winds, fixing frequency should be increased. Fixings should incorporate sealing washers of rubber or plastic. Fixings should be at least 50mm from the end of the sheet.

5.      Marvec should be laid so that side laps are away from the prevailing wind. Use a clear neutral silicone glazing sealant to seal the bottom of end laps.

6.      Marvec may be used on curved roof structures. The sheets must always be fixed over a central purlin.