What does EPDM stand for
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Ethylene Propylene Diene Monomer
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What thickness is the EPDM
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There are 2 versions available -
1.1mm which is generally used for light / smaller applications
1.6mm which is a heavier grade used for more demanding
applications.
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How is the EPDM joined
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Usually we do not need to join the EPDM as most roofs can
be fitted out of a single sheet.
If a join is necessary then we either weld the EPDM or splice
using the manufacturers preferred joining method
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How long does EPDM last
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The 1.1mm has a warranty for 20 years and the 1.6mm 30
years.
The actual life expectancy of EPDM is projected to be in
excess of 50 years
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Can the EPDM be layed
over existing felt
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As a rule , no , but there are exceptions.
- if the existing roof is sound with no leaks then new
boards can be fixed over the existing felt and the
EPDM applied to the new solid base.
- If the existing roof is sound and a warm roof is being
constructed then the old felt can be used as a vapour
control layer.
- If the existing roof is sound and a green roof or
ballasted system is being applied then EPDM can be
loose laid on top of the old roof. The weight of the soil
mix or ballast will retain the EPDM in position.
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What thickness boards are
required
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We always use 18mm as in our experience anything else is
not strong enough
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How is the EPDM fixed
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The EPDM is usually fully bonded to the new roof deck using
propitiatory adhesives.
In the case of a green roof or ballasted system the EPDM
may be partially adhered.
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What happens at the
edges?
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The EPDM is dressed over the edges and a specially
designed trim is applied either to direct any water in to the
gutter or act as a kerb to prevent water running down the
fascias/walls.
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What maintenance is
required
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Apart from sweeping off a few leaves in Autumn , nothing.
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Can the EPDM be repaired
if damaged
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Repairing an EPDM roof is very easy as a patch can simply
be over laid
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Can i walk on the roof
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Yes , as the EPDM is extremely tough.
Care should be taken if a sharp edge of a ladder is placed
on the roof or the roof area is used for storage purposes.
If area is to be used as a balcony or heavy foot traffic is
expected then specially designed non slip walkway mats
can be installed
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Can a deck be fitted over
the roof
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Yes , fitting decking over EPDM is very straight forward and
can be easily installed at any time with out penetrating the
roof.
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What happens round
skylights / pipes etc
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Specialised flashing is applied to any protrusions that moulds
to the shape of the object. This flashing cures in-situ to
provide a secure and long lasting waterproof seal integral to
the roof.
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under a green roof
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EPDM and green roofs work perfectly together
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Where can i use EPDM
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Repairing a flat roof , replacing a flat roof , on warm roof ,
repairing a roof valley or under a green roof , EPDM is very
versatile and can be used in many different applications
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