Anyone had issues with grp dry valley leaking during heavy rain?

21 Jul 2004
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United Kingdom

Got a fairly new build property. Has been installed with dry fit grp valleys. Same as the ones in this link:

During very heavy down pours there is water coming into the property. Normal rain seems no issues.

Has anyone experienced issues with this type of valley system? The rest of the roof looks in excellent condition, and it seems the only area of possible leaks could be the valley.

I understand that there is no mortar used when doing this type of install. Can it handle large volumes of rain? Where could source of leak be?
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I have seen these leak caused by build up of crud damming flow and also poor fitting. any pictures?

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