We built some flats in Leith back in '87 and'88. Nothing fancy (although I was very excited at that time, hoping they would sell at £40,000), only four stories with a pitched roof.
One of the little debates I had with my architect at the time was the colour of the rough cast. He suggested beige because it would weather better. I went with white because it would look better at completion when we were selling them.
Seems to me much the same debate is still going on!
There is a lot of bad detailing out there with regards to components of buildings which interface with render systems. But a lot of this stems from the manufacturer's information and specification put out.
If you are doing roughcast or wetdash systems or indeed in any of the more traditional systems you keep the cills out, proper bellcasts at given intervals and usually have a soffit board or cope projecting out over the plane of the wall.
Some performance render systems are sold as all singing all dancing go anywhere need nothing systems.
Stick it on a base coat or cement particle board, don't bother too much about drips, have a wee skittery powder coated trim at the wallhead instead of a cope never mind soffit, and also you can recess into it feature beams at floor levels etc, oh and you can do without drips where these features such as mid floor beams break the render panel up.
Perhaps one of the reasons murdomac that your rendered flats from the late eighties look okay is the pitched roof and eaves / soffit offer some protection.
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