Yep spot on there Keeza, 15 mm a must, also makes it easier to slide clips under. I think where most blokes get into trouble is they think that because they are using a levelling system they can take...
That is my main concern with this type of fixing system - drumminess.
Sounds like there are some golden rules:
1) Substrate needs to be near to straight as can be, grinding or filling may be...
bigbadwolf long time no word from you.No licencing down here .not even for landscapers. Have put pics up over the time ive been on here and have no problem posting for you , as Glen mentioned i do...
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