14
Gutter Capacities
Unifold can be used to improve either the water containment capacity and/or the drainage efficiency of
the gutter and outlets by a variety of means.
In ideal conditions, for built-up roof systems, given ample water capacity and sufficient access, any
gutter lining system will be installed to discharge the liner tray as well as the roof itself.
In practice, however, access beyond the eaves closure/drip flashing to the internal roof structure can be
extremely difficult without major roof work so it is sometimes inevitable that the gutter lining is installed
"gutter side" of these flashings.
More significantly, even if access is available to the roof construction at the eaves, if there is an
overwhelming need for depth improvement to the existing system due to existing gutter capacity
problems, then in order to achieve this, it may be necessary to ignore the condensation discharge from
the liner tray as being "the lesser of two evils".
Composite roof systems are not subject to interstitial condensation problems so the depth of
insulation can be readily used to increase gutter depth.
Use of roof construction depth
Composite
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UNIFOLD
roof example
Built up system
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UNIFOLD
roof example
Improvements to systems may use one or more of the following methods: -
1. Gutter capacities can be improved on many This action will dramatically improve the
occasions by using the roof construction depth drainage performance of the outlet, which will
and allowing the wings of the Unifold to extend discharge more quickly and in doing so, will
to the underside of the roof sheet, installing a relieve the water containment load in the gutter.
new eaves closure with a sealed filler above, to
close the construction.
3. Extra outlets are easily added to a Unifold
installation to greatly improve the gutter
2. Gutters, particularly
Conversion of square
efficiency. There is, of course some internal
ones with wide sole
shouldered spigot outlet
disruption whilst pipe work is installed to serve
to a coned orifice
dimensions, are rarely these.
freely discharging.
This situation can be
Nb: Additional outlets are provided with a
gutter lining system
corrected or at least
blanking plate to ensure the integrity of the
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improved, by cutting out
Unifold‘ system until the connection of pipe-
ovement of Gutter and outlet capacities
and removing the existing
work underneath is completed. Once the
outlet and replacing it D
serving pipe-work is complete it is a simple
1
=Existing outlet dia
with a Unifold metal and
D
0
=New effective dia=1.5
matter to open the outlet and render it fully
UNIFOLD Impr
L
membrane coned orifice.
T
=D
0
operational.
01384 252777 unifold@ampteam.co.uk www.gutterliners.com
The
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