Repairing render
Discussion
Are there any new methods to repair existing render?
Some of the render on the house is cracked and rather than traditional sand/cement which always cracks, I wondered if I can hack off the cracked bits (plus surrounding areas) and use something modern which is more flexible?
As well as the render repair, what can I use to repair/fill tired decorative elements such as this?
Some of the render on the house is cracked and rather than traditional sand/cement which always cracks, I wondered if I can hack off the cracked bits (plus surrounding areas) and use something modern which is more flexible?
As well as the render repair, what can I use to repair/fill tired decorative elements such as this?
Should find something suitable here, http://www.toupret.co.uk/business-customers/produc...
Some of them sand nicely, others cannot be easily corrected once set.
Some of them sand nicely, others cannot be easily corrected once set.
You can have a look at the data sheets, see which is most suitable for you.
I've found:-
The Murex can be applied as deep as you like in one hit, is white & paintable by the next day, sets very hard, you'll need emery paper to sand it and it's hard work - so you need to get the shape right before it sets. It goes off very quickly in hot weather. Consistency is a bit like dough but depends exactly how much water you add so you can make it stiffer/sloppier within sensible limits.
The 'F is more like a grey cement mortar, might need 2 or more hits for deep holes, sets a bit softer and sands nicely, it seemed to have a longer working time to me but it's says it's the same as the Murex in the sheets.
I've found:-
The Murex can be applied as deep as you like in one hit, is white & paintable by the next day, sets very hard, you'll need emery paper to sand it and it's hard work - so you need to get the shape right before it sets. It goes off very quickly in hot weather. Consistency is a bit like dough but depends exactly how much water you add so you can make it stiffer/sloppier within sensible limits.
The 'F is more like a grey cement mortar, might need 2 or more hits for deep holes, sets a bit softer and sands nicely, it seemed to have a longer working time to me but it's says it's the same as the Murex in the sheets.
Probably, but I've never used it, it seems to be reinforced Murex so will be equally 'unsandable', the Murex doesn't crack easily anyway. Obviously if the edges of the filled hole or the substrate move you will get hairline cracks at the join regardless of what filler you use. There is no magic answer.
I rang the Toupret UK office who gave me the mobile number of their 'technical specialist' or something. He didn't seem particularly interested but managed to get some answers!
He suggested Tourprelith F. He said that Murex can be used but it has crushed marble so it is a bit hard to sand.
Still a bit confused!
Yeah it's not a modern house.
He suggested Tourprelith F. He said that Murex can be used but it has crushed marble so it is a bit hard to sand.
Still a bit confused!
Yeah it's not a modern house.
If your house is Edwardian or earlier, it will almost certainly have been built with lime mortar rather than cement. Now, aside from breathability issues with cement, lime mortar is also flexible, so lime built walls can move and the lime pointing/render won't crack and fail. Cement on the other hand is totally rigid, so if a cement render is applied to a lime built wall, it will crack due to the constant flexing of the wall.
Hack the cement render off and redo it in lime.
Hack the cement render off and redo it in lime.
- if your house is 1930's or later, disregard all of the above because it will likely be cement built!
The house itself is old, however, the render appear to have been applied much later and is standard sand/cement. As far as I know, it was given a couple of licks of paint over the past 30 years and has generally faired well, however, there are some cracks (which do not seem too wide) which I'd like to sort before I repaint it.
Just a question of whether I use Tourprelith F or Murex.
Just a question of whether I use Tourprelith F or Murex.
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