Hi all, A neighbour is having a roof redone and part of the roof is an extension that was only done 20 years ago. I have 40 of those tiles off this roof now. I just noticed they are redland 90 on the back and not Marley moderns as they should be. Can I still use these Redlands with my Marley's on my roof? I know they were on my neighbours but that doesn't mean it's correct. Thanks all
