We have had these on our roof for about 8 years. We chose a colour to match other roofing products. They have now lost almost all of their colour and are a very light grey. If the 'slates' will be exposed to UV, then you must assume that they will lose the majority of their colour. Our review on Amazon has a photo that shows a spare slate that was left over from the original install placed on top of the weathered roof, with it alongside the darker grey edge of our velux windows (that these slates originally matched). We have contacted Tapco and they have refused to discuss this with us as their guarantee does not cover discolouration.
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Synthetic and Metal Slate, Shake, Shingle and Roofing Accessories for all your modern roofing needs