I agree with both theory 1 and 2 as problems.
1 the training given can be very good as good as you can get in a day and in good faith from the manufacturer but remember it should be aimed at already skilled plasterers and renderers.
It is crazy to assume that after 1 days applicator training you can expect a guy to fit to any standard. like any trade the app training should be done in co-ordination with on site experience working with skilled experienced men guiding you. any lads you take with no previous experience should be carefully monitored and guided by skilled hands, but no reason why they cant be trained up to a good standard.
I dont believe that manufacturers are handing out a training day and letting loose men on the product - far from it they would have a fit if they thought firms were doing this, its prob the firms and the middle men and the chancers who mis read the situation and think "hey look we can a day course and be fully up and running as an EWI installer" which leads into theory 2 the men creaming of the top and keeping labour rates at rock bottom asking forcing faster faster mentality or cutting corners in other words - a man needs to eat he will do what he needs to eat not take care of someones house. thats where its at right now in terms of rates too -shocking really for a "specialist installation" its the most legislated highly accredited lowest paid job going ? ? baffling aint it
I dont think a good system will fail if installed properly at least for a reasonable life expectancy but then a small matter of maintenance should suffice thereafter.
there are some exceptions - one famous product is having de-lamination issues right now and I hear that is down to their own components
That fully answers my question, the product is not fail proof and therefore can fail after installation, so yes the warranty /gaurantee is worth having to cover eventualities as described in the post above which cant be blamed on fitting error.
I think EWI's biggest problem is damage. Even with render it's still vulnerable. Yes it's flexible and you can knock it but it punctures with a screw driver or Stanley blade etc.
I think for longevity reasons ewi slabs would benefit from a 9mm gtec render board on them. A thin coat on that would be hard and flexible. Of course it would cost more but as a premium option for ground floor etc it's something to think about.