Preparing an internal granite wall for lime render

[thomo5949]

Hi all,

Does anyone have any advice as to how to prepare an internal granite wall for lime plaster.

I have cleared off the old plaster that almost fell off as soon as I looked at it. In the joints there appears to be a dry mud that can easily be rubbed out. I assume I need to prepare the surface so that the new lime plaster bonds well.

I was considering using a nail gun to clean out the joints and to clean the granite quoins that I want to leave exposed. Is this a good idea?

Some also suggested I PVA the wall with a watered down solution. I'd imagine that this would seal the wall which would defeat the object of using lime render. Is this right?

Thanks

 

[mointainwalker]

I don't know if granite has any special properties, but i found that a lime mix ( hydraulic lime 1/sand 3 1/2 ) stuck very well to my walls and i just wetted them.

I was considering using a nail gun to clean out the joints and to clean the granite quoins that I want to leave exposed. Is this a good idea

I don't understand. This makes as much sense as saying I was going to use my computer-screen to clean the joints. Nail-guns fire nails to fix things together not clean stone.

 

[Static]

I don't know if granite has any special properties, but i found that a lime mix ( hydraulic lime 1/sand 3 1/2 ) stuck very well to my walls and i just wetted them.

I was considering using a nail gun to clean out the joints and to clean the granite quoins that I want to leave exposed. Is this a good idea

I don't understand. This makes as much sense as saying I was going to use my computer-screen to clean the joints. Nail-guns fire nails to fix things together not clean stone.

Perhaps he means a needle gun?

 

[mointainwalker]

Hadn't heard of that before , having looked it up, seems likely .

 

[thomo5949]

Sorry, I did mean needle gun.

 

[marshman]

Give your walls a good wet down the day before you want to plaster to rinse off the dust and damping the mortar between the stones,
then before you plaster just give the wall a light mist to damping the stone, don't have your lime mortar to stiff it needs to be soft
and fatty, its better to fill out a deep bit with two or more layers of soft mortar than push in stiff mortar that will not bond properly.