Rendering over new blockwork

[User___removed]

anyone got any idea what the recommended time is to leave new blockwork before render
I thought I read somewhere 4 weeks?
Cheers

 

[carlos]

Good question. No idea lol

 

[Pug]

As soon as the mortar's gone off I'd have thought.

 

[User___removed]

It's 3 houses with a timber frame structure.block outer leaf
The guy wants me there the day after the last block is layed

 

[malc]

time is money, they will want you to start next day.

 

[Pug]

Mortar is pretty much set after a week but reaches full strength after a month.

 

[BigK]

Crack city there bobby


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[Arti]

Crack city there bobby


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Manchester..........................

 

[Marshy]

Rooney Rooney !!!

 

[User___removed]

Crack city there bobby


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I don't understand?

 

[Jerseyboy]

I've rendered plenty of block houses with sand and cement.
Normally they would have sat for 2-3 weeks while the roof and slates get fitted. I can't see you having any problems.
It's not as if they will build the whole house in one day then tell you to render the next.

 

[BigK]

I don't understand?

I meant you are increasing your chance of cracks somewhat if you are gonna go on it that quick, especially single skin block tied into a timber frame.


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[User___removed]

I was thinking 4 weeks

 

[Andy0705]

a week mate is fine

 

[vfr12]

The longer the better.defo not a week tho

 

[Jerseyboy]

I meant you are increasing your chance of cracks somewhat if you are gonna go on it that quick, especially single skin block tied into a timber frame.


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I find with most timber framed houses that they do crack more than a cavity build. Some people let the scratch coat sit for a week before finishing but I've seen it finished the next day to avoid high suction on large areas.
I have never had a problem with rendering using 3+1 scratch coat and 6 sand 1 cement + half a lime top coat.

 

[BigK]

You might be OK after a day Bobby who knows for sure?
Ultimately though, you've two separate lots of shrinkage & settlement in the timber & block.
However if I was under pressure I'd probably be on it after a week, full mesh??


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[Rossi46]

If you wanted to be really thorough then use a moisture meter and wait until the mortar is within 20% of the block moisture content.