Cure It GRP - GRP Edge Trims - Specifics; E280 Expansion Joint; Felt Roof Transition; C5 Closure Trim

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GRP Edge trims
C5 Closures
The C5 closure is used to close a run of E280 rolled joint trim. The closure should be overlapped
by 50mm and sealed by a bead of trim adhesive. Nail to deck, bandage around edges and apply
topcoat layer over the top.
E280 Application diagrams (2 options)
Decking
E280
25mm25mm
GRP Layer and bandage
Noggins at 600mm centres Joist
Deckshouldbexedtojoist
each side of expansion gap
Fixings for attaching
second joist
Decking
xedinto
joist
E280 Expansion joint
The E280 trim is used both to create expansion joints on large roofs (over 100m2) and create rolls on any
ridgedetails.ItiscompatiblewithC5closures,C8BandC9A.Atevery100msqor12linearmetresthe
decking should be gapped by 25mm to allow for expansion of the boards.
It is of critical importance that roofs of this size include extra structural reinforcement along the gapped
area. This can be done in one of two ways:
• Where the decking is gapped, the joists underneath should have noggins installed at no more than
600mm centres with extra ones along the wall taking extra care to ensure that the joists are properly
 bedded/xedtothestructureofthebuilding.Eachedgeofthegappeddeckingissecuredintothe
 nogginswiththestandard40mmpenetrationat200mmcentresinadditiontothedeckingovertheadjacentjoistsbeingxedasusual.
or
• Anextrajoisttimbercanbexedintothesideofthejoistoverwhichthedeckingisgappedby25mm.Eachsideoftheboard
 overthedoublethicknessjoistshouldbexedintothejoistat200mmcentreswith40mmpenetration.
DonotlaminateoverthewholeoftheE280trim,onlyovereachoftheangesasthismakesthetrimmorerigid.
Thedeckingoneithersideoftheexpansionjointshouldnotbeallowedto‘oat’freelyasthiswillencourageundueexpansionandpotentially
lead to cracking of the laminate.
Joist Joist
Joining a GRP roof to a felt roof
The E280 can also be used to bridge between a GRP
andadjoiningfeltroof.TheE280shouldbexedto
the decking at the end of the GRP roof taking up the
felt at the edge if possible to lay the trim underneath.
The felt should be bonded to the trim with a liberal
coatingofTopexacrylicroofcoatingbothunderand
over the felt layer. You will then need a new piece of
felt 400mm wide and the length of your trim. Wrap
it over your trim from the GRP side and torch it onto
thetrimandexistingfelt(edgetrimprolesareame
resistant)orbonditdownusingTopex.Thisshould
be completed before the laminate is laid over the
other edge of the trim.
Felt Bandage
TheE280isxedtothe
decking on the GRP side
at 200mm centres.
New strip of felt 400mm bonded to
the E280 and existing felt.