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Old Mod
Ok so just heard from Architect and he's getting back to me on grade!
Check and double check , everyday is a learning day on tilersforums 🙂
I'm with @3_fall on this one.....
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http://www.tilemasteradhesives.co.uk/docs/uploads/PrimePlus_TDS_2014.pdf
Could be worth a call to the tech guys but I've never known it to be an issue. If anything, new asphalt will be better than old as no or little oils leached out
Not a problem you with 3_fall but if it is exterior grade beware warranty. Webber won't guarantee it.
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Haha yeah I know mate no worries!
Yeah I've seen that by weber
I'm waiting on reply from architect, he's aware now, as am I!
And I'll be speaking with Tilemaster also.
As I said earlier, thank you for your question.
Might have saved me some grief!