Had a call today from a visitor to the forum. She had a failed waterproofed shower and wanted to know how she might go about checking if her tiler was even certified. His website says he is but never showed his card when starting the job.. Once again if he isn't certified the homeowner really needs to sight and ensure the tradesman is what he says he is. The problem will need to be rectified by the tiler as he is responsible for the work he carried out, that's common sense but the customer still has to bear some responsibility for who they employ. For goodness sakes a little bit of research and investigation can reduce the chance of any problems later on. How are you guys for being certified. Your customer can ask for a producer statement for both product and tradesmen. If you aren't certified the customer won't get any manufacturers guarantee. I know what some of you will say and it's true you may have been applying liquid membranes for ages without any trouble but you won't get the backing of the products manufacturer if it's a product failure. A new code of practice for internal wet areas is about to be released so hopefully once and for all time we will have some rules that will protect both our customers and ourselves. If you aren't certified why not sit a course. It won't cost anything but your time. Late last year we had a course for Ardex and an hour and a half with BBQ and beers on a Friday afternoon went down well and now we can recommend those tilers as certified ARDEX applicators. How have you benefitted from sitting a course ? Apart from the free food and beers that is. If you aren't certified you can just ask your local tile store to arrange a course for the product you use, it's as simple as that.