Stained Grouting - what has caused this ?

billyw · Post by **billyw** » Sun Oct 31, 2010 7:35 pm

Shower area tiled approx 1 year ago - white tiles & white grout used - white grout has begun to discolour - tiler suspects the discolouration has occured from behind the tiles and has not been caused by general use.

Plywood (15mm) was glued and screwed to 70 x 45 framing. Tiler treated ply with PVA and tiled using good quality materials

Appears to be no issue with tiles moving, falling off etc

Anybody got any idea why this grout has discoloured ? After 40 yrs experience in the joinery trade I've never seen his happening!!

Thanks.

wine~o · Post by **wine~o** » Sun Oct 31, 2010 7:42 pm

Soap...more likely the customer is using highly coloured soap...green would be shield/fairy....yellow is that yellow soap the name escapes me...if black..then it's mould and inadequate ventilation...

marc1106 · Post by **marc1106** » Sun Oct 31, 2010 7:51 pm

wot colour is the staining? probably due to womens hair products! could possibly be pulling the sap from the plywood too!!!!

dewaltdisney · Post by **dewaltdisney** » Sun Oct 31, 2010 9:00 pm

If it is an orange colour it could be the early stage of mould culture. This stuff is good for cleaning it up http://www.amazon.co.uk/HG-Mould-Spray/dp/B000IU40HQ

DWD

handyman · Post by **handyman** » Sun Oct 31, 2010 9:14 pm

does it look anything like the frist pictures in this link??
cleaning-grout-t16799.HTML

Only-Me · Post by **Only-Me** » Sun Oct 31, 2010 9:49 pm

If its a light coffee coloured stain, then its more likely drawing the stain from the ply. Should have used 12mm Hardibacker

PVA should NEVER have been used.

Colour Republic · Post by **Colour Republic** » Mon Nov 01, 2010 1:24 am

Could be many different causes most common would be

A) mould from poor air flow
B) mould from fatty deposits
C) resins from the ply leaching

And as has been said, pva should not have been used, even more so in a wet area

youngdevonray · Post by **youngdevonray** » Fri Nov 05, 2010 11:18 pm

i have the same problem my grout goes pink i think its a chemical reaction to the shower gel we use have replaced the grout once but it went pink again with in a couple of months so thinking of replacing it with silicone sealant any better ideas id love to hear

tictic · Post by **tictic** » Fri Nov 05, 2010 11:23 pm

all off the the above....and you may have a leak....

handyman · Post by **handyman** » Sat Nov 06, 2010 7:44 am

youngdevonray wrote:i have the same problem my grout goes pink i think its a chemical reaction to the shower gel we use have replaced the grout once but it went pink again with in a couple of months so thinking of replacing it with silicone sealant any better ideas id love to hear

See link already posted above

Stained Grouting - what has caused this ?

Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?

Re: Stained Grouting - what has caused this ?