V Flow GRP Valley Trough Slate Valley Standard Fixing from European Plastics | Swansea

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V-Flow GRP Valley Trough Slate Valley (Standard Fixing)

The GRP Slate Valley is a modern cost-effective
alternative to using a traditional lead valley when
used with natural and man made slate coverings.

At a fraction of the cost and weight of lead, GRP
valleys are supplied in convenient 3mt lengths,
which are easy to transport and handle on site.
GRP products are easy to cut, and sufficiently flexible
to allow for a variety of roof pitches.

GRP valley troughs are manufactured from a lead
grey, glass reinforced polyester, and applied with a
UV inhibiting film to the external surface.

Installation
Valley boards should be fitted of sufficient width to
provide support for the roofing battens, and must be
flush with the top of the rafters; or a 6mm ply-wood
laid over the rafters.

The valley is first lined with a strip of roofing
underlay along the length of the valley, to be 1mt
wide.

A length of valley should be pressed into the valley
and marked with a chalk line, where a longitudinal
batten will be fixed as support for the edge of the
valley.

Starting at the base of the valley, the troughs should
be nailed onto the longitudinal batten with large
head clout nail at 500mm centres.
Consecutive lengths of valley should have a
minimum overlap of 150mm. At the top of adjoining
troughs, the units should be mitred and dressed with
a code 4 lead saddle. The fascia board may need to
be trimmed to ensure full water flow into the rain
water gutter.