Cure It GRP - Laminate Delamination; Topcoat Delamination; Topcoat Cracking; Laminate Cracking

22
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aking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ne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xings,thesemayneedtobere-xed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conrms
•ThedeckinghasnotbeenrebatedwhereA-trimshavebeen thattheroofmaybesubjecttoponding,andunlessspecied,
attachedcausingalipwhichholdswaterback. itisdifcult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.