White Patches Over Indian Stone

[Philayl]

wasthe sandstone sealed prior to grouting?

No, done after

 

[Spud]

looks like the sealer has bloomed to me this sometimes happens if you seal moisture in the tile

 

[DHTiling]

Like i said.. for salts to come through sandstone it will take more than 2 days..

Same for sulphate attack Doug..


Looked at the pics and it looks like what has already been mentioned.. sealer has bloomed due to moisture..and could just peel off if topical sealer was used.

You need to call the builder back and ask what he used and how long did he wait for the stone to dry before sealing.

 

[Philayl]

Thanks for the info, will do as you have suggested

 

[siob]

Hi, did you sort the white patches? Ive had the same happen to me. Indian Stone patio layed and looked beautiful. Then the cement pointing was done with a dry mix brushed all over, then brick acid to remove any stains, then sealed. Hey presto lots of white patches all ove rthe stone and a grey-ish haze which has dulled all the colours which were fine before. Not sure whether its the stone soaking up the concrete below, the sry mix brushed on, the brick acid or the seal so.... im getting the stone sandblasted back to an original layer which has not been treated and leaving it to let any natural chemical reaction to the underneath cement happen and hopefully in time they will look good as new. Thats the idea anyway which seems better than ripping it all up!

 

[DHTiling]

Is yours black limestone..??

 

[siob]

No its a red/yellow stone. The red is more affected by the white patche, the yellow less so but im thinking thats just because its lighter and harder to see the discolouration

 

[siob]

PS. Dave i can upload pics later on to show the discolourations, any info/help is much appreciated and if youre doubtful the sandblasting will restore the stone to a level not affected by the chemical recation caused by any of the dry mix cement brushing or brick acid or seal trapping in any/all of these your advice would be greatly received. The sandblasting is planned for the next dry day, probaly Mon or Tue next week.

 

[Dan]

Bump