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Over
Fascia Ventilating System (OFVS)
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OFVS
is a one-piece ventilation system which incorporates continuous
ventilation with an insect inhibitor, underlay support,
maintenance free gutter drip and bird excluder (on units
for use with profiled tiles).
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4
Page Brochure
Detailing
characteristics,
range, installation & technical information.
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| Over
Fascia Ventilating System (OFVS) |
| Function: |
OFVS10
and OFVS25 Over Fascia Ventilating System for tiled roofs to
provide:
1.
Eaves level roof void ventilator.
2. Hinged underlay support.
3. Bird excluder.
4.
Insect Inhibitor.
5. Drip into gutter.
OFVS10/L
and OFVS25/L Over Fascia Ventilating System for slate roofs
(including interlocking slates and plain tiles) to provide:
1.
Eaves level roof void ventilator.
2. Hinged underlay support.
3. Insect Inhibitor.
4. Drip into gutter.
Complies
with the requirements of Part F2 of the Building Regulations
1995 and the recommendations of BS5250 2002 for eaves level
ventilation in slate and tiled roofs over 15° pitch.
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| Material: |
Polypropylene |
| Free
Vent Area: |
OFVS10
and OFVS10/L:
Equivalent to 10mm continuous opening.
OFVS25
and OFVS25/L:
Equivalent to 25mm continuous opening.
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| Colour: |
Black |
| Range: |
There
are 4 types of OFVS strip available, details of their general
characteristics, ventilation capacity and usage are as follows:
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PRODUCT
CODE
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VENTILATION
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ROOF
FINISH
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OFVS1O*
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10mm
continuous
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Profiled
Tiles
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OFVS1O/L
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10mm
continuous
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Flat
Tiles and Slates
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OFVS25*
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25mm
continuous
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Profiled
Tiles
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OFVS25/L
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25mm
continuous
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Flat
Tiles and Slates
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*These
items have integral bird excluder
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Roof
Pitches: 15° to 70°.
Note:
Below 23° additional support may be needed for the support
flap to prevent ponding.
Effective
Length:
OFVS10 and OFVS10/L 900mm.
OFVS25 and OFVS25/L 480mm.
Movement
Allowance: ±
5.5mm/unit.
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| Fixing: |
Installation
by the roofer in new build and re-roofing work to slated and
tiled roofs from 15° to 70° pitch.
Note:
Take extra care to prevent ponding below 23°.
Nailing:
3.35mm diameter 65mm long galvanised steel nails at 200mm
centres (ring shank nails; Scotland and N Ireland). For roofs
with ridges over 7.2m and in areas of high exposure, calculate
fixings in accordance with BS 5534.
Jointing:
The system's components have interlocking joints for forming
continuous straight lines. Mitre the strips at hips and valleys.
At inner valley joints, fix over a separate flashing extending
at least 150mm on each side of the joint.
Parapet/Valley
Gutter Situation:
In a parapet/valley gutter situation in the absence of
a fascia, it may be possible to introduce a timber fillet
on which the system can be fixed (as shown below).
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| Pack Information: |
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