Why has my bricks gone white after using waterproofer on them ?

Question

Hi there I recently brought a sika waterproofer from tool station , I needed to attempted to seal the bricks outside my property , due to it being a end of terrace the corner gets hit by the bad weather , so seem to get mould from the cold wall , so I googled few things and it seemed that waterproofer would be best idea as it fills all the gaps up and water seal apparently  does not , but on use after diluting it’s made all the walls go white , I assumed it would if anything make it go shiny like pva type thing but it has not , so what’s best thing to remove this now and best thing to use as I was thinking of attempting water seal next ? Can anybody help with this cheers

David · Answer

It’s most likely efflorescence. Salt seeping out of the brick usually encouraged by water. There are efflorescence removers in the market but it’ll keep happening until all the salt has gone. Also with there now being a sealant over the top it’s not clear whether that would interfere with remover. 
It’s unlikely that it’s blooming from the Sika waterproofer, however there are better products on the market.

James · Answer

To treat wall will have to dry out properly what happens if done when not dryer out your just trapping the moisture in the wall maybe a blower on the bricks then apply the compound

Lewis · Answer

Salt makes bricks go white most likely had the product on two long caused this to happen.a brick acid clean should help but wash it off after 20 mins or so

Matthew · Answer

I work with lots of natural stones, granites marbles etc, we obviously have to seal them - if you let the sealant sit, once it dries it hardens (as that’s how it seals all the pore holes etc) and the colour it hardens is a white crusty type texture - because of the flamed finish on bricks you’re not going to be able to wipe it off so I’m guessing you’ll have to jet wash this off! There’s different types of sealants for different materials also, check the one you used is definitely the correct one.

Nick · Answer

bricks can be purchased with a lime run on them     or salt in rainwater

Why has my bricks gone white after using waterproofer on them ?

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