Cure It GRP, Руководство по установке

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Troubleshooting guide
Problems that occur after the roof has been laid
1) Delamination of the laminate from the boards
Description of problem - Laminate is raised and springy.
Possible cause Remedial action
• This is caused by poor adhesion of the laminate to the boards and is • The laminate can be completely removed and reapplied after
more likely to happen with plywood rather than OSB.
priming the boards with G4 (to ensure no further
delamination occurs).
• Possible indicator of water contamination. • Fixings can be used to secure the laminate. Fixings are then
bandaged over the roof. The roof is not leaking and there is no
contamination with water.
2) Delamination of topcoat
Description of problem - This will not cause the roof to leak in most cases, but will spoil its appearance.
Possible cause Remedial action
• Application of the topcoat to a contaminated surface (usually wet). • The topcoat cannot just be reapplied on top of existing topcoat.
• Application of the topcoat to a hot laminate may also cause this • Generally, the best solution is to clean and abrade the surface,
to happen. removing all of the flaking top coat, then wipe with acetone coat and
• Whenever the adhesion of the topcoat is poor, some topcoat re-laminate the entire roof surface and reapply the top coat.
delamination may occur.
3) Cracking of the topcoat
Description of problem - Cracks may appear as fine lines on the substrate. This will not cause the roof to leak in most cases.
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 (0.25m²) then re-topcoated.
4) Cracking of laminate
Description of problem - Could cause the roof to fail if cracking is severe enough.
Possible cause Remedial action
• The roof is over 100m
2
and an expansion joint has not been • Grind down and laminate over the crack with two layers of
incorporated into the roof. 450g/m
2
reinforcement mat.
• Impact. • It may be necessary to cut out a section and laminate and
• Structural Movement. incorporate an expansion joint at 100m² intervals.
• Always check the board fixings, these may need to be re-fixed if
they have been pulled away from the joists.
5) Ponding/standing water
Description of problem - A common problem and one which will not affect the performance of the roof but can be unsightly when a roof is
overlooked, or, worse still, if it occurs on a balcony.
Possible cause Remedial action
• The roof has been installed with an inadequate fall. • The best solution is to ensure that the original quotation confirms
• The decking has not been rebated where A-trims have been that the roof may be subject to ponding, and unless specified,
attached causing a lip which holds water back. it is difficult to guarantee that this will not occur.
• It is often not possible to improve the fall through the use
of decking boards with help to disguise the water.