Project1_Layout 1 07/05/2013 RAINWATER SYSTEMS
Primed or painted cast iron
Anthony Hitchman, commercial director at Rainclear Systems, discusses the options available when
Cast iron offers unrivalled bespoke
design options, as no other
manufacturing method can match the
versatility and bespoke manufacture
possibilities of casting.
So, why should you choose pre-painted
cast iron? While it is more expensive than
primed cast iron, the long-term cost benefits are
substantial. Properly protected and installed cast
iron can last in excess of 100 years.
Too often, primed systems that are painted
on-site will suffer from premature exposure to
the elements and if water starts to attack the
building, the cost of correction work will be
substantial when compared to the small initial
investment in the protection offered by factoryapplied
The cast iron rainwater systems we stock
are treated with a certified three-coat system
that is factory-applied under strictly controlled
conditions that won’t need repainting for 10
years. It is usually recommended that cast iron
rainwater systems are repainted every five years
to protect the core material correctly.
The paint is specifically developed to give a
smooth and long-lasting finish to the cast iron,
which is difficult to replicate on-site.
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choosing primed cast iron or pre-painted cast iron for a rainwater system
The long-term cost of choosing primed?
Priming and painting on-site is more difficult, as
several factors such as weather, skill, care of the
painter and paint quality have a huge impact on
Meanwhile, the factory-applied painting takes
place in strictly controlled conditions, which
means that it is applied to a consistently high
standard, so performs better.
When it comes to restoring cast iron
guttering, recycle what can be saved and only
replace what is needed, instead of replacing
wholesale with plastic.
Tips for restoring cast iron
Traditionally, cast iron guttering was chosen for
its durability as well as beauty. But this toughness,
that makes it last 100 plus years, does not make
it hard to work with. The system is made of
components so, although it is still often a two-man
job to install, the components can be replaced
as needed, while others can often be renovated,
restored and reinstated.
If you need to cut cast iron guttering or
downpipe components, you will need a diamond
blade for your angle grinder.
Should you need to drill an additional fixing
hole in the guttering, hopper, or other component,
you will require a steel drill bit. You may find that
the initial outer surface is hard – this is normal as
cast iron does form a hard layer during the casting
process, but once you are through this layer, you
will find it much easier to drill. The important
thing to remember when drilling cast iron, is to
use a slow revolution on the drill and maintain a
steady downward pressure.
Helping professional installers for many
years, we are able to share our experience and
knowledge with them. No question a customer
asks is a ‘silly’ question if it helps them to find the
right product or solution for their project. If we
don’t have the answer to hand, we’ll know who to
ask and will get back to them.
On our website rainclearsystems.co.uk,
visitors will find helpful discussions and articles
available. They will also be able to download
PDF installation guides and view videos on
cast iron rainwater systems on renovation and