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Stained Grouting - what has caused this ?
Posted: Sun Oct 31, 2010 7:35 pm
by billyw
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.
Re: Stained Grouting - what has caused this ?
Posted: Sun Oct 31, 2010 7:42 pm
by wine~o
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...
Re: Stained Grouting - what has caused this ?
Posted: Sun Oct 31, 2010 7:51 pm
by marc1106
wot colour is the staining? probably due to womens hair products! could possibly be pulling the sap from the plywood too!!!!
Re: Stained Grouting - what has caused this ?
Posted: Sun Oct 31, 2010 9:00 pm
by dewaltdisney
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
Re: Stained Grouting - what has caused this ?
Posted: Sun Oct 31, 2010 9:14 pm
by handyman
does it look anything like the frist pictures in this link??
cleaning-grout-t16799.HTML
Re: Stained Grouting - what has caused this ?
Posted: Sun Oct 31, 2010 9:49 pm
by Only-Me
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.
Re: Stained Grouting - what has caused this ?
Posted: Mon Nov 01, 2010 1:24 am
by Colour Republic
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
Re: Stained Grouting - what has caused this ?
Posted: Fri Nov 05, 2010 11:18 pm
by youngdevonray
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
Re: Stained Grouting - what has caused this ?
Posted: Fri Nov 05, 2010 11:23 pm
by tictic
all off the the above....and you may have a leak....
Re: Stained Grouting - what has caused this ?
Posted: Sat Nov 06, 2010 7:44 am
by handyman
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