I have used an sand and cement render internally on 4 walls in my house following the removal of an internal chimney breast (with the intention of adding a little strength following the brick removal, etc).
On the upper floor there were 2 internal walls - each was brick, and was rendered with 12-15mm of sand / cement render at a mix of 1 part cement to 4 parts sand (and the sand was 3 parts plastering sand to one part building sand). On this floor no waterproofer was used in the render.
On the lower floor there was 1 internal and 1 external wall, both brick, which were rendered with 12-15mm of sand / cement render at a mix of 1 part cement to 4 parts sand (and the sand was 3 parts plastering sand to one part building sand) - on this floor wickes standard waterproofer was used.
I thought everything looked good - but the final surface of the render was finished with a wooden float and then scored in a wavy line using 3 screws protruding about 2-3mm about an inch apart on a wooden batton. Each set of these wavy scratches have a gap of around 3 inches before the next set, and I have been warned that this might not be ideal spacing to provide the best possible key to plaster on?
The rendering was done on a DIY basis using batons, but I was hoping to get a plasterer to apply a plaster finish.
Can anyone give me some advice about what options there are to get a plaster finish on this type of surface?
One plasterer has suggested he would apply a tight coat of bonding before plastering, but I have another friend who seems very against the idea of using any bonding (if possible) who says he thinks we should find a way of doing this without using bonding because of possible issues later on with damp, etc?
It would be great to get some advice on what could be done in this situation? Is bonding the way to go? Are there other options? Am I doomed? :RpS_unsure:
On the upper floor there were 2 internal walls - each was brick, and was rendered with 12-15mm of sand / cement render at a mix of 1 part cement to 4 parts sand (and the sand was 3 parts plastering sand to one part building sand). On this floor no waterproofer was used in the render.
On the lower floor there was 1 internal and 1 external wall, both brick, which were rendered with 12-15mm of sand / cement render at a mix of 1 part cement to 4 parts sand (and the sand was 3 parts plastering sand to one part building sand) - on this floor wickes standard waterproofer was used.
I thought everything looked good - but the final surface of the render was finished with a wooden float and then scored in a wavy line using 3 screws protruding about 2-3mm about an inch apart on a wooden batton. Each set of these wavy scratches have a gap of around 3 inches before the next set, and I have been warned that this might not be ideal spacing to provide the best possible key to plaster on?
The rendering was done on a DIY basis using batons, but I was hoping to get a plasterer to apply a plaster finish.
Can anyone give me some advice about what options there are to get a plaster finish on this type of surface?
One plasterer has suggested he would apply a tight coat of bonding before plastering, but I have another friend who seems very against the idea of using any bonding (if possible) who says he thinks we should find a way of doing this without using bonding because of possible issues later on with damp, etc?
It would be great to get some advice on what could be done in this situation? Is bonding the way to go? Are there other options? Am I doomed? :RpS_unsure:
