| Fig 1.
Standard eaves fixings |
| The
overhang of the existing corrugated sheet is trimmed back in line
with the facia. A new raised facia is fixed to the height of the top
edge of the Onduline support battens. The rainwater goods are
re-fitted. The Onduline sheet is then laid with a maximum of 70mm
overhang at the eaves. A ventilator strip is fixed to eaves batten. |
|
| Fig 2.
Flush eaves fixing |
| The
flush eaves detail avoids cutting the existing corrugated sheet or
repositioning the rainwater goods. A ventilator strip is fixed to
the eaves batten sealing the existing roof corrugations; this is
overlaid with an eaves tray, its rear edge supported by a secondary
batten. Onduline sheet is laid with a maximum of 25mm overhang from
the front edge of the eaves tray. |
|
| Fig 3.
Eaves spar brackets fixing |
|
An alternative method of avoiding the
cutting of the existing corrugated material is to use a spar fixing
brackets fixed to the main support battens, allowing the rainwater
goods to be easily re-positioned. |
|
|
Fig 4.
Verge details |
| The verge
is formed by using the preformed Onduline verge section, or by
forming a verge cloaking piece from zinc or similar flashing
material. |
|
|
|
|
| Fig 5.
Ridge detail |
| In most
cases the existing ridge units can be retained. In these situations
the top of the main batten may need to be chamfered to suit the
raised ridge line. Onduline preformed ridge pieces can then be fixed
utilising an additional support batten as shown. |
|
| Fig 6.
Steel fixing detail. |
| Steel
oversheeting support structures can be fabricated following the same
basic principles applied to timber structures. Galvanised steel
multibeam rails are fixed from eaves to ridge with drill screws
through the roof covering into the existing purlins. These are then
overlaid with steel "Z" section purlins at 600mm centres to which
the Onduline sheets are fixed using the Onduline Stelfix drill
screw. |
|
