Existing rendered substrates
- Hammer test and remove all areas of loose, ‘bossed’ hollow render.
- Treat surfaces with weber CL150, a biocidal wash, to remove any traces of organic growth.
- Make good surface using weberend stipple and weberend TUC or weberend PUC.
New-build masonry or frame structure
Ensure all surfaces are clean, in plane and of adequate thickness to provide appropriate support and stiffness without deflection or edge protrusions.