BAL sbr

[Wood's better]

Hi,

I hope you can help?

I have a fully dry screed that the Plasterer laid like a ploughed field. I have used a floor grinder to flatten, I have vacummed and primed with 1 coat of SBR today diluted 4 parts water 1 part BAL sbr (as recommended by BAL for dust suppression)
I forgot to ask technical if I needed to apply 2 coats, have checked all literature and cannot find anything mentioning second coat. Please could you answer?

For information this is the plan:

• Screed dry (over 4 months)
• 1 coat sbr applied today
• Marmox over that using BAL ptb
• lay UFH
• Mapei renovation screed
• tile with porcelain

Look forward to hearing from you.

Best regards,

Richard.

 

[DHTiling]

OK to me..

 

[Wood's better]

Thanks Dave,
So second coat not necessary.?
Appreciate you taking the time to respond
Richard.

 

[DHTiling]

Thanks Dave,
So second coat not necessary.?
Appreciate you taking the time to respond
Richard.

As long as the substrate is not dusty or overally porous then no..

 

[Wood's better]

Promise last question(s)!!!!
I think I hoovered well with my big Numatic Hoover, but will check tomorrow when dry for any residual dust.
However, is there a check for porosity? Drops of water pooling ??
By giving second coat of sbr can you over prime? And would it be same 4:1 ratio?
Thanks in advance
Richard.

 

[DHTiling]

A second coat will not hurt , but what you do not want is a skin... if you wipe your hand on the screed and it comes of dusty , then prime again.. other wise IMO it is fine.

 

[Wood's better]

Great, thanks very much. Have a good weekend. Very decent of you to take the time to reply.

 

[DHTiling]

hey no probs at all , and you enjoy your week end Rich ..

Will you pop back and let us know how you get on and treat us to some pics maybe..

 

[Wood's better]

Will do. I'll take some pics in stages.
Be in touch (won't say soon as its my own extension!!!)

 

[DHTiling]

Nice one... pop back if you need help .

 

[Aston]

Promise last question(s)!!!!
I think I hoovered well with my big Numatic Hoover, but will check tomorrow when dry for any residual dust.
However, is there a check for porosity? Drops of water pooling ??
By giving second coat of sbr can you over prime? And would it be same 4:1 ratio?
Thanks in advance
Richard.

the easiest way to check for porosity is to brush some water over and area and see how quickly it dries. if it stays damp for 2o mins, then the porosity is lower, if it dries within minutes, then its higher.

as for ratios, start off low and then reduce ie 4-1, then 3-1 etc...
hope this helps

 

[Wood's better]

It does help, thanks.