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Spunky - I know that now! Unfortunately that's what the architect specified and the brickie was more than happy to use them. I think we're just going to hack it all off and use standard s/c render.

Have just hacked off a bigger area and attached pics. The basecoat looks to be only 2mm thick. The blocks are wet over the whole area, but due to the size of the crack and the fact that we are fairly exposed I'm not that surprised. In some parts there seems to be another coat. The base coat is...

thanks for all your inputs. Just found the products used. The base coat was CPI's high bond (flex) render with a polymesh then topped with a their one coat render. The corner beads are the white plastic variety. Will take photos today and post. The render was put up in a period of 'heavy' rain.

The blocks are celcon. I believe the blocks haven't cracked as most of the cracks are in line with the render beads. The cracks started after 6 months and the render has deteriorated over the last 18 months. I'm guessing the basecoat is powdery, as Goody said, and where cracks are, water has got...

22jasper and 4400kevin, Not sure which the product was, although it was a grey basecoat with mesh and then a white topcoat. The render has blown mainly at the beads. Although in a couple of other areas it has cracked and blown. The first area that blew was from a corner bead, but stretched...

Hi All, A tale of woe. About 2 years ago we had a new extention, built of lightweight blocks, rendered in a CPI two coat system with a mesh set into the basecoat. About six months later we noticed that one corner of the render had blown. We contacted CPI and the rendering company who both said...