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24

Warm roof

2013 Part L regulation specification

2013 Part L Reg’s Specification
A GRP roof can be easily configured in either a warm or cold roof specification. For a warm roof, a sub deck is first fixed to the joists at 300mm
centres. A vapour check and insulation sheet is then laid over the top. Insulation sheets can also be purchased with a vapour check adhered to
one side, following insulation manufacturer’s guidelines for satisfactory bonding and fixing.

The decking should then be fixed on top as it normally would be. Screws should be used to fix the boards to the joists, these should penetrate
through the insulation and into the joists by at least 40mm. It is imperative that all layers on the roof are pressed firmly together and that there
are no gaps between any of the layers.

The GRP should then be laminated over the top of the roof, these roofs will usually require larger edge trim sizes such as A250 and B300. To
comply with the Part L Regulations at the time of printing, the following specification would be required to obtain the following ‘U’ value as
shown below.

12mm Ply Sub Deck

Based on Celotex FR5000 or equivalently specified insulation*
U= 0.20 - 95mm
U= 0.18 - 105mm
U= 0.15 - 130mm
U= 0.13 - 160mm
Or equivalently specified insulation

18mm T&G OSB3 Board

Cure It Glass Reinforced Laminate

*Based on λ (lamba) value of 0.21 from Celotex FR5000 2012 version

Warm roof application

Joist

Subdeck

Insulation

with vapour

check

18mm

OSB3 T&G

GRP laminate

A250 or B300 trim would

be applied to this edge

Decking

Trim to be applied

Insulation with vapour check

Sub deck

Joist

Gutter

Fascia

GRP layer and bandage

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Summary of Contents for GRP

Page 1: ...Installation Guide Installation handling storage and technical information ...

Page 2: ...all Good environmental profile High security cannot be cut with a knife Cold applied free of the risks associated with hot works Maintenance free No seams joints or welds Easy to repair in the unlikely event it is damaged Completely UV resistant Can be used to convert an existing flat roof for use as a balcony or roof garden Can be used to permanently contain water for applications such as ponds o...

Page 3: ... Roof 8 Stage 1 Laying the Deck 9 Stage 2 GRP Edge Trims 10 13 Stage 3 Laminating 13 15 Stage 4 Topcoating and Finishing 16 Hardener Addition 17 Material Quantity Estimation 18 General Advice 19 Troubleshooting 20 23 Warm Roof Part L Specification Guidance 24 GRP Trims 26 CONTENTS PAGE Contents Training is recommended before using the Cure It system ...

Page 4: ...at roofing system comprising of a Cure It GRP laminate with Cure It Topcoat when tested to BS 476 3 2004 was designated EXT F AB no limitations on use F AA rating is available with the exposed aggregate finish Resistance to wind uplift The Cure It GRP roofing system is fully bonded to the roof substrate The system will be resistant to any wind uplift that could reasonably be expected during the pr...

Page 5: ...ter of the roof Use an expansion joint E280 trim if the roof is over 100m Applying the Cure it Resin Reinforcement Mat Bandage all joints between trim sections and between trim and decking Do not use Cure It roofing materials in wet or damp conditions or apply onto any damp or moist areas They WILL fail Never apply Cure It directly onto brickwork When dealing with a complicated detail that isn t c...

Page 6: ...00 Simulated lead flashing 2 The edge of this roof was masked off before the aggregate finish was applied 3 C1 preformed universal external corner 4 C4 Preformed universal internal corner 5 A200 drip trim Laid to facilitate water running off the roof 6 A slight fall is engineered into the substrate to avoid standing water 7 B260 Raised edge trim 8 D260 laminated into the substrate remains unattach...

Page 7: ...Mask Carbon filter mask optional Cure It roofing materials Cure It Roofing Resin Cure It Topcoat This is available in Graphite Grey as standard BS 00 A 13 or a selection of pre pigmented colours GRP Edge trims Cure It Reinforcement Mat This is available in 2 weights 450g m2 for most roofs and 600 g m2 for applications where the roof will be subjected to heavy foot traffic i e a walkway or balcony ...

Page 8: ...e boards Fixing the edge trims page 10 13 GRP edge trims are fixed to the perimeter of the roof and can be used to adapt the Cure It laminate to almost any application Laminating pages 13 15 Joints between decking gutters GRP trims and protrusions e g pipes are bandaged at this point The entire roof is then laminated with a layer of GRP Topcoating and finishing page 16 The roof is then topcoated w...

Page 9: ... off set between the joints in each row When two rows have been laid the boards can be aligned to run straight Fix the boards to the joists using a ring shank nail or screw with 40mm joist penetration at 200mm centres Continue to lay each row in turn using the off cut from one row to start the next row The last row is simply cut off in line with the fascia Fixing the deck to different substrates T...

Page 10: ...trim in place ensuring the face is vertical Drive fixings in at each end then the middle and then at 100mm centres thereafter Most common trim types and application instructions A170 A200 A250 Drip Trim The A type trim is a drip trim fitted to the lowest edge of the roof usually where the rainwater flows into the gutter Two support battens should be fixed to the perimeter of the roof to provide sp...

Page 11: ...p chase cut out with an angle grinder fitted with a mortar chase disc Apply the Cure It Trim Adhesive in a continuous strip to the back of the C trim Fit the trim into the slot and press firmly back to the wall to overlap the D trim Apply a lead sealant along the length of the trim into the slot to seal the trim in Do not topcoat TRIM DETAILS C100 Standard simulated lead flashing with 100mm vertic...

Page 12: ...ly be fixed to the deck along the bottom edge There are many other applications for the F trim including vertical details where laminating would be time consuming under the feet of air conditioning units to enable re roofing without disconnecting and use on some parapet wall details etc The trim should be nailed to the deck around its edges and bandaged over any joins or nail penetrations Any unla...

Page 13: ... each corner and 200mm strips of bandage for each trim joint Laminating the roof Cure It Roofing Resin Cure It Roofing Resin is supplied in tins of 20kg for ease of mixing simply use the measurements on the Cure It Mixing Bucket The Cure It Mixing Buckets are graduated in kilos which will allow easy calculation of the amount of hardener needed depending on the ambient temperature Hardener must be ...

Page 14: ...4 Continue across the 1m approximately 6 runs and then roll the roller over the whole area again to ensure good even coverage Wet out the next 1m of board in the same way remembering to use one third of the Cure It Roofing Resin on the board and two thirds of resin on the mat Roll out the mat over the next 1m of wet out board and continue to roll out the Cure It Roofing Resin as previously describ...

Page 15: ...he edge of the roof and in windy conditions as a fine spray will be emitted from the roller Make regular close inspections of the laminate as it is consolidated checking for pinholes and areas short of Cure It roofing Resin Pinholes in the laminate will lead to porosity and water penetration While completing the next metre wide run of laminate put a quick wash coat of the resin 1 roller full per 2...

Page 16: ...movable It is too time consuming to clean the roller sleeves Unscrew the nut with pliers and drop the used sleeve into the bucket of used resin Either use disposable latex gloves when handling hardener or resins or clean hands with hand cleaner Do not clean hands with acetone Wipes are also a useful addition to your toolkit As well as cleaning hands they are good for removing uncured resin splashe...

Page 17: ...o this can result in streaking on the laminate where streaks of uncured resin will remain visible and ultimately lead to a failure in the laminate Fast cures can result in an inadequate bond Deck Resin temp 22 35o C 18 22o C 12 17o C 0 11o C Percentage Hardener 1 Hardener 2 Hardener 3 Hardener 4 Hardener Table of Percentages in Millilitres Per Weight of Resin Used Amount of Resin Hardener Usage 1 ...

Page 18: ...g 8 1 x 10kg 10 16 5kg 400ml 1600ml 2 x 1kg 1 15 2 25 42 5 1 x 10kg 2 x 20kg 10 1 x 10kg 12 5 16 5kg 500ml 2000ml 2 x 1kg 1 19 2 30 50 1 x 10kg 2 x 20kg 12 1 x 5kg 1 x 10kg 15 16 5kg 600ml 2400ml 3 x 1kg 1 22 2 35 57 5 3 x 20kg 14 1 x 5kg 1 x 10kg 17 5 16 5kg 6 6kg 700ml 2800ml 3 x 1kg 1 26 2 40 65 1 x 10kg 3 x 20kg 16 1 x 20kg 20 16 5kg 6 6kg 800ml 3200ml 4 x 1kg 1 30 3 45 72 5 4 x 20kg 18 1 x 20...

Page 19: ... mixed with Cure It Roofing Resin and cover any exposed edges This will seal the deck and prevent moisture uptake until the laminate can be applied Always cover the edges of the roof and uncoated boards with a polyethylene sheet Always ensure the deck or substrate to be laid onto is completely dry before laying the laminate Sweep off any excess water and mop up the excess with dry cloths before al...

Page 20: ...minate 3 It begins to rain while laminating topcoating Description of problem Roof has not yet cured and it begins to rain Possible cause Remedial action N A STOP Cover the roof with a non woven polyethylene sheet and try to ensure that non of the laminate gets any moisture onto it Always ensure that you check the local weather forecast before you start a roof Always have enough polyethylene sheet...

Page 21: ...a new laminate If the debris is causing a significant lump it should be ground down with an angle grinder first 8 Spillages Description of problem Spillage resin spray Possible cause Remedial action N A Resins stick by mechanical adhesion they soak into a surface and cure It is essential to clean the resin off the surface before it cures The solvent for uncured resin is acetone This can be used to...

Page 22: ...ses Possible cause Remedial action This is usually caused by the topcoat being applied too thickly The only solution is to relaminate over the cracked area after topcoat should never be applied thicker than 0 5mm thoroughly sanding affected area and cleaning with acetone Area should be sanded to remove topcoat wiped with acetone coated with resin mixed with hardener 0 25m then re topcoated 4 Crack...

Page 23: ...er cannot properly form Tacky topcoat usually occurs at approximately 5o C surface temperature and this is usually caused by very hot conditions and direct sunlight 8 Colour fade of topcoat Description of problem This can take several years to appear and the problem may be worse if the topcoat was tacky when first laid Possible cause Remedial action This is caused by erosion of the topcoat and is ...

Page 24: ...f are pressed firmly together and that there are no gaps between any of the layers The GRP should then be laminated over the top of the roof these roofs will usually require larger edge trim sizes such as A250 and B300 To comply with the Part L Regulations at the time of printing the following specification would be required to obtain the following U value as shown below 12mm Ply Sub Deck Based on...

Page 25: ...solidly attached to the concrete at 300mm centres The Sterling board should then be fixed to the battens using the same fixings as would normally be used Ensure there are no gaps between the layers The laminate can then be laid over the top as normal Cross section of warm roof onto concrete or asphalt Topcoat layer Topcoat GRP laminate GRP layer Kingspan TR26 or equiv Kingspan TR26 or equiv Concre...

Page 26: ...ion at 200mm centres in addition to the decking over the adjacent joists being fixed as usual or An extra joist timber can be fixed 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 fixed into the joist at 200mm centres with 40mm penetration Do not laminate over the whole of the E280 trim only over each of the flang...

Page 27: ...27 Notes ...

Page 28: ...hnical cureit uk com Web www cureit com Technical Support Training Available weekdays 08 30 16 30 DOWNLOAD THE APP URE IT GRP WATE RPRO OFIN G SY STEM Downloadonthe Android Market Downloadonthe App Store FS 616789 ISO 9001 2008 ...

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