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I have a gable wall that needs to be re rendered. It is an external rubble stone/granite and lime wall. It is currently rendered with cement thats cracked and letting in water, rotting a number of internal floor joists.
Im intending to hack off the old render and go back to the stone outside. Ive already done this inside(the old plaster came off easily with a shovel), so i will effectively have two bare stone walls on either side, a clean slate.
So what are your opinions on how i should progress. If i render the external wall in cement and sand and waterproof paint it will be waterproof. But not breathable. If I then coat the internal wall with lime plaster, this will enable the wall to breathe and all the water that is in the wall to escape(it is already drying out which i can see). Since the wall is now sealed from the outside, then this wall will dry out over time as heat from inside keeps the wall dry.
The other option is to render with lime outside, which im not familiar with and i suspect will be more much expensive. Ive been quoted 2k (minus scaffold) to rerender in sand and cement, its a 12m two storey, is a lime render going to be more expensive?
Do my suggestion sound reasonable and would the wall completely dry out as the wall breathes through the internal plaster. Can i assume that an interal lime finish would help? Opinions welcome.
Cheers,
Im intending to hack off the old render and go back to the stone outside. Ive already done this inside(the old plaster came off easily with a shovel), so i will effectively have two bare stone walls on either side, a clean slate.
So what are your opinions on how i should progress. If i render the external wall in cement and sand and waterproof paint it will be waterproof. But not breathable. If I then coat the internal wall with lime plaster, this will enable the wall to breathe and all the water that is in the wall to escape(it is already drying out which i can see). Since the wall is now sealed from the outside, then this wall will dry out over time as heat from inside keeps the wall dry.
The other option is to render with lime outside, which im not familiar with and i suspect will be more much expensive. Ive been quoted 2k (minus scaffold) to rerender in sand and cement, its a 12m two storey, is a lime render going to be more expensive?
Do my suggestion sound reasonable and would the wall completely dry out as the wall breathes through the internal plaster. Can i assume that an interal lime finish would help? Opinions welcome.
Cheers,