render help

[perfecto]

hi there im doing a job just now,its a balcony thats been lined with ply,breathable membrane and e.m.l. scratch coat then white s+c topcoat.
dont know if the guys that done it put any lime in because its all cracked.however i've been called in to fix it so i s.b.r.d it then pet a coat of scrim adhesive on then bed the scrim on.now i'm going to do a white s+c topcoat.what mix should i use??? cheers in advance.

 

[shaky1]

surely with name like perfecto u should know what mix u should do that is if u have rendered before:RpS_laugh:

 

[perfecto]

just want to know what u guys think cause a dont want to f**k it up so if u aint got a decent answer dont answer:RpS_laugh:

 

[shaky1]

no need to bite back only having a laugh do like a 4 and 1 every 1 has there own preference m8

 

[perfecto]

and a shovel full of lime because theres prob slight movement in boards.possibly why it cracked in first place.

 

[shaky1]

cant beat the lime also ur feds

 

[keithuk]

hi there im doing a job just now,its a balcony thats been lined with ply,breathable membrane and e.m.l. scratch coat then white s+c topcoat.
dont know if the guys that done it put any lime in because its all cracked.however i've been called in to fix it so i s.b.r.d it then pet a coat of scrim adhesive on then bed the scrim on.now i'm going to do a white s+c topcoat.what mix should i use??? cheers in advance.

Welcome mate ,is the Eml straight on the ply with the membrane behind it ,no gap to allow the render to key with the EML ?

 

[perfecto]

ply then membrane then eml then s+c scratch coat and top coat but theres big cracks in it thats why i scrimmed it
whats feds btw?

 

[johniosaif]

The first coat should of been allowed to dr
y for a week before second was applied, the should of had fibres and possibly embedded mesh, you may now have too much weight to allow any more added on. You need to know previous strengths to know what to apply now anyway. Pre bagged white render with embedded mesh may be a solution

 

[perfecto]

why pre bagged and not s+c? its only a 10 mm coat that i'm putting on the render was solid but just had hairline cracks all over it.
the only thing thing thats annoying me is the ceiling is getting done too so once iv'e done that again its prob gonnae be a 20mm coat which is a bit of a weight for a ceiling!!!

 

[keithuk]

Are architects still using this system , walked away , never done one without a problem and that was 20 years ago ,things have moved on , better products on the market , best of luck mate

 

[perfecto]

cant walk away its a builder i do regular work for.he got someone else when i was on holiday and this is what i come back to:RpS_mad:

 

[jmoss5]

Batton before eml to allow to breathe surly

ply then membrane then eml then s+c scratch coat and top coat but theres big cracks in it thats why i scrimmed it
whats feds btw?

 

[perfecto]

i'll just have to wing it then

 

[beddy]

Prime it and acrylic it

 

[keithuk]

i'll just have to wing it then

Ok mate ,just tell him you will do it to what ever spec he says ,but you are not happy ,the risk is yours , sign here please :RpS_thumbup:

 

[perfecto]

well cheers anyway,al manage...always do

 

[essexandy]

Batton before eml to allow to breathe surly

The batten doesn't just allow it to breathe but also helps deflect movement in the ply. I never seen a job where they don't batten the ply that hasn't cracked.

 

[beddy]

I've never seen that before. So you ply, batten, paper, eml?

 

[perfecto]

its about 15 mm thick marine ply.i've done a few jobs like that but none with a batton between ply and membrane.

 

[malc]

we pulled eml off ply that had not been battened ,and the eml had acted like a shield , stopping the sand and cement from keying.
it needs to have battens so that the sand and cement can get round the back of the eml to key.
we only use rib lath.

 

[essexandy]

I've never seen that before. So you ply, batten, paper, eml?

Yes mate it's the correct way to do it. Your welcome.