rendering over rend aid

[jmsplastering]

Hi lads...got a small gable to render,, can i rend aid it ,,then finish with sand and cement instead off ocr and would i need to scratch coat first or just go straight over in one coat....cheers

 

[carlos]

Why not rend aid the OCR and finish it in one go????

If you s+c you will need to 2 coat.

 

[jmsplastering]

Sorry mate,,rendaid the ocr???

 

[keithuk]

Hi lads...got a small gable to render,, can i rend aid it ,,then finish with sand and cement instead off ocr and would i need to scratch coat first or just go straight over in one coat....cheers

Ocr it job done ,but you can s/c over the rendaid if you want ,i don,t know if you still have to scratch coat out mate ,sorry

 

[keithuk]

Hi lads...got a small gable to render,, can i rend aid it ,,then finish with sand and cement instead off ocr and would i need to scratch coat first or just go straight over in one coat....cheers

Rigsby your guy ,he will advice you on that one :RpS_thumbup:

 

[Rigsby]

I wouldn't put s&c on rendaid myself. Ocr is in my opinion a bit more than s&c. I would apply a sbr slurry and scratch coat. But that's me.

 

[essexandy]

Use Parex Monogris E (Parex version of Rendaid) followed by Parmurex, wet on wet. Assuming it's a strong substrate.

 

[Arti]

how do people have time to start rendering over and SBR slurry when it seems to always suck in so fast and dry up before you get any gear over it?

 

[keithuk]

Use Parex Monogris E (Parex version of Rendaid) followed by Parmurex, wet on wet. Assuming it's a strong substrate.

Andy ,why is that better then rendaid ?

 

[malc]

how do people have time to start rendering over and SBR slurry when it seems to always suck in so fast and dry up before you get any gear over it?

it all depends on the suction , if it is a shuttered concrete wall i would let the slurry set and scratch next day. if it was a blockwork or high suction wall, we get set up to render, muck boards full, fully organized, sbr the wall and scratchcoat.
we work in a gang of two plasterers.

 

[essexandy]

Andy ,why is that better then rendaid ?

Not saying it's better mate just that now we're getting into the bagged products we're using Parex.

 

[S a plastering]

how do people have time to start rendering over and SBR slurry when it seems to always suck in so fast and dry up before you get any gear over it?

prime it first mate at 4-1sbr then slurry it stop it pulling in too quick

 

[Curry]

Andy ,why is that better then rendaid ?

Its cheaper

 

[keithuk]

Its cheaper

Cheap is not always best :RpS_wink:














unless you are supplying the materials :RpS_wink:

 

[Arti]

Its cheaper

how much cheaper is it?

 

[plasterjfe]

Its cheaper

are you sure ? rendaid is like £13 a bag plus, how much is monogris ?

and I have seen a few mention monogris lately - Up ere our specs of our reps always just say microgobetis and have never mentioned monogris - are your reps in the south telling you to use monogris ?

 

[daneside]

rend aid is in bags andy:RpS_laugh:

 

[xyzplasterer]

it all depends on the suction , if it is a shuttered concrete wall i would let the slurry set and scratch next day. if it was a blockwork or high suction wall, we get set up to render, muck boards full, fully organized, sbr the wall and scratchcoat.
we work in a gang of two plasterers.

If you let it set and render the next day the render will sit on top of the slurry coat...this is bad practice. A spatterdash coat for next day this will give you a key and control suction.

SBR slurries are messy and as others have said useless especially when temperatures are high. Better off rend aid or micro and rendering next day.

I've put CPI general purpose over Rend Aid. Went like a dream.

 

[solway]

A spatterdash coat the next day,can you explain a little more here.What does your spatterdash coat consist of? Cheers

If you let it set and render the next day the render will sit on top of the slurry coat...this is bad practice. A spatterdash coat for next day this will give you a key and control suction.

SBR slurries are messy and as others have said useless especially when temperatures are high. Better off rend aid or micro and rendering next day.

I've put CPI general purpose over Rend Aid. Went like a dream.

 

[Arti]

If you let it set and render the next day the render will sit on top of the slurry coat...this is bad practice. A spatterdash coat for next day this will give you a key and control suction.

SBR slurries are messy and as others have said useless especially when temperatures are high. Better off rend aid or micro and rendering next day.

I've put CPI general purpose over Rend Aid. Went like a dream.

How is it bad practise to let the slurry dry. its used to provide a key just like rendaid?

 

[carlos]

http://www.permagard.co.uk/media/uploads/SBR Bonding Additive Data Sheet.pdf

We use SBR a lot and it says on this data sheet that it should still be wet when rendered over.
we always do it wet but just because we do it don't make it right

 

[stuart23]

Last week we done a couple m2 over old sound render, Applied an sbr slurry coat then scratched over it. Went back to it few days later and it was cracked and loose, had to hack it all back off as the scratch was just sitting on the slurry as mentioned above. Took an angle grinder to the old render and scratched when sbr tacky and all fine now.

 

[stuart23]

Meant to say the first time we scratched we had allowed the sbr slurry to dry completely.

 

[xyzplasterer]

A spatterdash coat the next day,can you explain a little more here.What does your spatterdash coat consist of? Cheers

http://www.sovchem.co.uk/media/media/PDF/Specifications/Tec._H4_-_Different_key_coats.pdf