After a year I have the following problem, pieces of plaster (1+ inch deep, 4"x5" on the surface) from vertical walls occasionally (every 4-5 months) fall off. The problem according to a contractor is the cement. I think that's without doubt as the plaster falls of with a small piece of cement always ( about 1/8" ) .
The reason for this was attributed to bad cement mix: The original fault I was told was the addition of too much water to the mix. does that sound plausible? provable? The gravel seems to be also a bit too oblong, slits rather than rounded, but of medium/fine size.
The remedy is quite expensive, injections into the cement. But only local treatment. Given the rather rare occurrences, and since I repaint every 2 years maximum, does it really worth it? ( total house surface
1600sqf)Other solutions - total replastering ? ( with global cement treatment) - glass fiber cloth ? ( on existing plaster, without cement treatment) - covering with prefabricated plaster on metallic trellis base, on top of existing regular plaster.
Your ideas?
I could also pursue legal remedies but... am not sure what is best. it's a bit of gutting experience.