Lime not used in Top Coat ????

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Hi

We have just had our house pebbledashed ( dry harled ) and it looks great !

The roughcaster asked me to supply all the materials including hydrated lime.

The top coat consisted of Snowcrete Portland Cement and Sand to which he added a measure of Cementone Freeflo additive ( a combined plasticiser, waterproofer and retarder ).

For the job he used 27 bags x 25Kg of Snowcrete cement in total, however he hardly even used 1/5 out of one 25Kg bag of hydrated lime.

I am sure that he did not have his own lime as he asked me to supply everything which I did to the letter.

Am I going to have a problem - has there been a mistake ?

Many thanks.
 
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Lime will add a little fluff or workability to the render, some will add it to encourage a paler finish, but the lack of lime will in no way effect the strength or durability of the finished product.

In fact renders formed from sand/cement and water-proofers (no lime) are probably stronger but more brittle.
 
Cheers Noseall

I just found it strange that he had me supply it then not use it ?

The roughcaster is a great guy, nothing was too much trouble for him, so I can only assume that he changed the plan that he had in mind.

He did add a drop of exterior grade PVA to the mix and he said that this made the mix easier to work with and that it would set harder.
 
He'd need more than a drop for 27 bags to have any effect. If he used SBR they recommend five litres per bag of cement.
 
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