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We have a series of installation guides to help you install any of the products we supply.  Today we will have a look at the installation of Eurosix Fibre Cement Sheets.

Eurosix installation guide

Key facts

•Minimum pitch: 5° (88mm fall in 1m)

•Maximum purlin centres: 1375mm for loadings up to 1.89kN/m2

•Always use two fasteners per sheet per purlin, no more and no less.

•Do not walk on the sheets – always use crawling boards, roof ladders, etc.

Lap requirements

You will need to consider your location to establish your need for lapping and sealing.

We consider areas of severe exposure to include buildings that stand above their surroundings, or that are located in areas with no windbreaks within 1km, such as on coasts or hilltops.

If you are unsure, please do contact us for advice.


Locate lap sealant using 8mm diameter butyl strip sealant as shown. We do not recommend gun grade sealants as these are not suitable. For double sealed end laps, the second strip of sealant should be sited 100-200mm below the fasteners.

Laying the sheets 

Sheeting on both slopes must start at one end of the building, rising in vertical tiers, one sheet wide from eaves to ridge. If you are using cranked crown ridges, it is vital accurate alignment of that the slopes are ensured


To ensure four layers of roof sheets never overlap corner mitring of two sheets is required, so they lay in the same plane. The nominal dimension of the mitre cut is the side lap (70mm) x the end lap (minimum 150mm). The gap between the mitre cuts of the two sheets must be 3-6mm.

If using cranked crown ridges, the sheet and the ridge must be mitred, but when using two piece ridges, mitres are not needed. Profiled translucent sheets are laid unmitred, as are the corresponding fibre cement sheets at these junctions.


2 fasteners per sheet per purlin is a requirement. All holes must be drilled through the sheet, do not use punches, and ensure the holes are 2 mm larger than the fastener diameter.

Topfix fasteners are often used as these drill through the Eurosix sheet, open up the oversize hole and drill into the purlin. They also have an integral sealing washer. There are a variety of fasteners for drilling into timber, light gauge steel and heavy gauge steel. We can advise on the correct fastener suitable for the roof pitch and purlin type. For single skin sheeting, the fastener sizes are usually as follows.

  • 6.5 x 130mm for timber
    • 6.3 x 105mm for cold rolled steel
  • • 6.3 x 110mm for hot rolled steel

Sealing washers and caps should be used with traditional fasteners, such as M8 x 120mm drive screws for timber, crook bolts for zed purlins and hook bolts for angle section purlins.

The fasteners should be positioned on the first full corrugation to the side of the side lap (see diagram). At end laps, the fasteners should be 50mm from the top end of the lap.

For vertical sheeting contact a member of our team for further advice.