Cement Render or Plaster

[Ziggy123]

Hi
Hope someone can help
I have recently hacked off the old render 1 meter high from my dining room as it was contaminated from a bridged DPM.
What I have removed was a sand and cement render and a skim top coat plaster. I was wondering if I need to replace with the same or can I use a standard plaster scratch coat with a multifinish top coat.
The walls were quite damp - is a sand and cement render more water resistant?
Can I add a waterproofing agent to either the render or plaster in case there is any more damp penetrating? Or is it best to tank with a bitumen latex before rendering.
Bricks are in reasonable condition
If cement render would the mix be 4:1 sharp sand

thanks in advance

 

[jbonding]

it sounds like you havent sorted the problem or the sorse of the damp.
unless the damp has gone theres no point rendering and gypsum plasters wont help

 

[Ziggy123]

Hi,
Thanks for the reply
I think I have sorted the source of the damp as there was a raised area of paving along the external wall which was bridging the damp proof course which I have removed. Also the internal render was joining the concrete floor. I was just thinking that it may be worth putting an additive in just in case the problem was rising damp and might give it a little more protection as I have to do it anyway.

many thanks.

 

[JohnD]

don't mention rising damp

 

[Ziggy123]

Okay
Sorry, won't mention it again!
thanks

 

[jbonding]

Hi,
Thanks for the reply
I think I have sorted the source of the damp as there was a raised area of paving along the external wall which was bridging the damp proof course which I have removed. Also the internal render was joining the concrete floor. I was just thinking that it may be worth putting an additive in just in case the problem was rising damp and might give it a little more protection as I have to do it anyway.

many thanks.

forget rising damp it doesnt exist

use a sand and cement with a waterproofer, do a search on here and you will find out a bit more