Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


3267 posts

Uber Geek
+1 received by user: 77

Trusted

Topic # 160144 25-Dec-2014 22:23
Send private message

After 3 years in a brand new house, I got tired of the constant mould issue in our shower.  The kid's shower was tiled with epoxy grout, but ours with the usual grout (different style showers, different type grout).  The tiler used epoxy grout only on the floors and on the kid's plastic shower liner.  The kids have virtually no mould, but we have lots except on the (epoxy grout) floor.  Used lots of different things, including vinegar which over time etches the grout so makes it worse, and methylated spirits which (over)feeds the mould until it burst and dies but looks ugly.  In a year or two we'll get the tiler back to replace the silicone, will get him to also replace our wall tile grout with epoxy grout.

So this is what I've done yesterday in an attempt to get sanity for a bit longer, wonder what you guys think (and maybe give others ideas for their mould issues).  First I've used a (Karcher handyman's) water blaster to clean out as much as I could.  I though I'd need to be careful, but no issues at all.  Even silicone withstands a brief blast as long as you don't go in under a lifted edge.  You could see the mould wash away, leaving only some (light) black stains.  Wow, it is fun using a water blaster in a shower.  Glad we have a big shower about 1mx2m.

Next was cleaning (bleaching) with Janola spray to make it look better.  This one does not have bleach in it, it has peroxide so is a bit easier to deal with.  Then I've wiped down and dried it out with the assistance of a dehumidifier.  The bathroom was tanked out with a sealer membrane (including the ceiling) so no risk of moisture getting stuck in the framing.

After it was dried, I've applied some water based acrylic sealer.  It is a sample of Holdfast Armacrete that a supplier gave me a few years ago, easy to paint on and then rub excess off with a microfibre cloth.  Decided to also paint over the floor tiles, it might just make them less slippery.

So this morning I've tried the shower, and can say the sealer will make a big difference.  Normally the grout would get a wet look after a minute or so, but this morning it stayed its dry colour so with no water to feed mould, there should be no more mould.  And the floor tiles are less slippery.  It is just short of feeling like a sticky floor, very happy with it.  I might even paint the rest of the bathroom floor.




You can never have enough Volvos!


View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2
2277 posts

Uber Geek
+1 received by user: 370

Trusted
Subscriber

  Reply # 1203799 25-Dec-2014 22:30
Send private message

I've lost count how many times I've re-siliconed my one shower to get rid of some mold, even with a dehumidifier going it managed to survive. I might try some of your tricks and see how it goes.



3267 posts

Uber Geek
+1 received by user: 77

Trusted

  Reply # 1203811 25-Dec-2014 23:04
Send private message

Forgot to add that I've overcome soap scum on the glass panels with no chemicals, just once a day wipe down with a micro fibre cloth.  Does not have to be the last shower, just once a day get the cloth on the glass to rub off the grime.  First couple of times it was hard(er)/rough, but within a few days it smoothed out and no scum any more.  I've been doing that for a few months now.




You can never have enough Volvos!


1569 posts

Uber Geek
+1 received by user: 400


  Reply # 1203818 25-Dec-2014 23:52
Send private message

Think of mould as a weed in the garden with very deep roots and seeds that will be everywhere. If you just scrub it off at the surface it will come back and sorry there's no mould killer.

To remove it you'll need to be a bit more drastic.

2495 posts

Uber Geek
+1 received by user: 311


  Reply # 1203836 26-Dec-2014 05:15
Send private message

insane: I've lost count how many times I've re-siliconed my one shower to get rid of some mold, even with a dehumidifier going it managed to survive. I might try some of your tricks and see how it goes.


Hunt out the current installation instructions. They most likely don't have silicone where it shows on the inside.but up behind the channel when fitted. Where they do have it on the outside it is less likely to go mouldy.

304 posts

Ultimate Geek
+1 received by user: 66


  Reply # 1203839 26-Dec-2014 07:29
Send private message

You can get certain silicones with anti mould in them which seems good at stopping it

14066 posts

Uber Geek
+1 received by user: 2514

Trusted
Subscriber

  Reply # 1203840 26-Dec-2014 07:30
Send private message

Two year old bathroom and no mould or any sign of it. Massive extractor, not one of those light integrated ones, right over the shower. How's your air flow?




AWS Certified Solution Architect Professional, Sysop Administrator Associate, and Developer Associate
TOGAF certified enterprise architect
Professional photographer




3267 posts

Uber Geek
+1 received by user: 77

Trusted

  Reply # 1203843 26-Dec-2014 08:08
Send private message

Mould needs 3 things, irrespective of how deep the roots can go.  That is food, water, and heat.  Stop one of them, and you stop the mould (that is the theory).  I'll get the grout replaced eventually, but for now I want to see how well my sealing works and then (when this gets done) apply it over the epoxy grout.  At Bunnings I also saw an anti-mould additive for grout.  The anti-mould paint I've used in our previous house worked excellent, so I'll talk to the tiler about that as well.  It makes sense that epoxy grout would work better, because it seals and no cracks develop for mould to take root.

Air flow is not great, part of the problem as I have flies.  But the house is air conditioned 24/7 to lower humidity as I get frequent ear infections.




You can never have enough Volvos!


1569 posts

Uber Geek
+1 received by user: 400


  Reply # 1204160 26-Dec-2014 18:56
Send private message

Yeah some people don't realise that for an extractor fan to work properly there needs to be an inflow of air from somewhere. If opening the bathroom window isn't an option open the bathroom door.

2495 posts

Uber Geek
+1 received by user: 311


  Reply # 1204188 26-Dec-2014 19:38
One person supports this post
Send private message

Often the bathroom door has 20-30mm gap at bottom to ensure airflow.

14066 posts

Uber Geek
+1 received by user: 2514

Trusted
Subscriber

  Reply # 1204199 26-Dec-2014 19:43
Send private message

Those combined light extractor things are hopeless, my extractor probably moves ten times more air on high.




AWS Certified Solution Architect Professional, Sysop Administrator Associate, and Developer Associate
TOGAF certified enterprise architect
Professional photographer




3267 posts

Uber Geek
+1 received by user: 77

Trusted

  Reply # 1206162 30-Dec-2014 18:03
Send private message

Found this additive which I'll add to the grout when it gets replaced (sometime in the future).  Can also add it to paint in troublesome areas.
http://www.bunnings.co.nz/vc175-tropical-strength-mould-killer-50ml_p00500192




You can never have enough Volvos!


1735 posts

Uber Geek
+1 received by user: 348

Trusted

  Reply # 1209853 7-Jan-2015 12:22
Send private message

I have used an oven cleaner to remove mould, as well as soap deposits, scum, etc from shower wells. This was for stainless steel / formica combos - not too sure how it would go on grout though.

Sprayed on, waited 15-20 mins, brushed / washed off with a dustpan brush. Cleaned the aluminium metal trim a treat too. Shiney .

Do wear breathingsealed and eye protectioncool though. And gloves. Otherwise your skin will dissolve to soap. Great for removing your fingerprints from your fingers ......





My thoughts are no longer my own and is probably representative of our media-controlled government


858 posts

Ultimate Geek
+1 received by user: 53

Subscriber

  Reply # 1211424 9-Jan-2015 22:02
Send private message

When you are at the stage the grout and silicon are being replaced particularly the later make sure whoever is doing the work preps the surface thoroughly and hygienically - remove all the old material as thoroughly as possible - don't just patch the worst black parts of the grout cut it all out wash the surface with Resene Moss & Mould Killer or similar, wear gloves if a professional is dong it make sure you supervise don't let them use their finger to finish of the silicone as that causes mould to grow later unfortunately its still a common practice some don't know better others do it because its quick and easy.  Make sure a wet area silicone is used as that generally has mould resistant additives.

834 posts

Ultimate Geek
+1 received by user: 260

Trusted

  Reply # 1211431 9-Jan-2015 22:14
Send private message

SepticSceptic: I have used an oven cleaner to remove mould, as well as soap deposits, scum, etc from shower wells. This was for stainless steel / formica combos - not too sure how it would go on grout though.

Sprayed on, waited 15-20 mins, brushed / washed off with a dustpan brush. Cleaned the aluminium metal trim a treat too. Shiney .

Do wear breathingsealed and eye protectioncool though. And gloves. Otherwise your skin will dissolve to soap. Great for removing your fingerprints from your fingers ......



That's a very expensive way of buying and applying NaOH.  You'd be much better off using NaClO, or as most housewives have been calling it for years - bleach.  But you know, you probably don't want 6-7 times the product for a 1/3 - 1/2 the price.

1735 posts

Uber Geek
+1 received by user: 348

Trusted

  Reply # 1212361 12-Jan-2015 11:00
Send private message

Glassboy:
SepticSceptic: I have used an oven cleaner to remove mould, as well as soap deposits, scum, etc from shower wells. This was for stainless steel / formica combos - not too sure how it would go on grout though.

Sprayed on, waited 15-20 mins, brushed / washed off with a dustpan brush. Cleaned the aluminium metal trim a treat too. Shiney .

Do wear breathingsealed and eye protectioncool though. And gloves. Otherwise your skin will dissolve to soap. Great for removing your fingerprints from your fingers ......



That's a very expensive way of buying and applying NaOH.  You'd be much better off using NaClO, or as most housewives have been calling it for years - bleach.  But you know, you probably don't want 6-7 times the product for a 1/3 - 1/2 the price.


Bleach doesn't get rid of the soap scum, only hides it by bleaching. Bleach wont kill mould on porous surfaces.




My thoughts are no longer my own and is probably representative of our media-controlled government


 1 | 2
View this topic in a long page with up to 500 replies per page Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Intel introduces new NUC kits and NUC mini PCs
Posted 16-Aug-2018 11:03


The Warehouse leaps into the AI future with Google
Posted 15-Aug-2018 17:56


Targus set sights on enterprise and consumer growth in New Zealand
Posted 13-Aug-2018 13:47


Huawei to distribute nova 3i in New Zealand
Posted 9-Aug-2018 16:23


Home robot Vector to be available in New Zealand stores
Posted 9-Aug-2018 14:47


Panasonic announces new 2018 OLED TV line up
Posted 7-Aug-2018 16:38


Kordia completes first live 4K TV broadcast
Posted 1-Aug-2018 13:00


Schools get safer and smarter internet with Managed Network Upgrade
Posted 30-Jul-2018 20:01


DNC wants a safer .nz in the coming year
Posted 26-Jul-2018 16:08


Auldhouse becomes an AWS Authorised Training Delivery Partner in New Zealand
Posted 26-Jul-2018 15:55


Rakuten Kobo launches Kobo Clara HD entry level reader
Posted 26-Jul-2018 15:44


Kiwi team reaches semi-finals at the Microsoft Imagine Cup
Posted 26-Jul-2018 15:38


KidsCan App to Help Kiwi Children in Need
Posted 26-Jul-2018 15:32


FUJIFILM announces new high-performance lenses
Posted 24-Jul-2018 14:57


New FUJIFILM XF10 introduces square mode for Instagram sharing
Posted 24-Jul-2018 14:44



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.