background for tiling a shower

[Gazzer]

Seems we now have an answer to the question of weight limits with paint on tanking systems

 

[DHTiling]

We do yes and Mapei will post it here when they get this thread...

But to clear this up... paintable tanking systems DO NOT alter the weight limits for the substrate..

 

[Rich]

Sorry, I really dont want to push this any further but I am confused, does this mean that the info I was given is wrong or have I just made a mountain out of a mole hill by not being clear with my wording?

 

[DHTiling]

Your rep was wrong.. i too phoned my rep and he said the same as yours... but a call to technical cleared it up...

 

[Rich]

Right, I get it now. Sorry for the fuss I caused and thanks for putting me right

 

[DHTiling]

Not a case of putting right,, just wrong info passed on... And the question asked to technical was including aqua defence etc..

 

[doug boardley]

.....big sigh of relief here!

 

[dock]

The coverage of Mapei Mapegum 1.5Kg/m[SUP]2 [/SUP]/mm which we consider to be a little too much. Even at this a 2 coat application on to plasterboard will bring down the maximum weight of tiles and adhesive to 29Kg/M[SUP]2[/SUP].

Dock

 

[DHTiling]

Hi dock
What about skimmed Walls?


Sent from my iPhone

 

[dock]

plaster = 20Kg/M2 - 2 coats of Mapegum WPS = 17Kg/M2

dOCK

 

[DHTiling]

Sound, so just a 3kg reduction

Thanks for popping on and clarifying that


Sent from my iPhone

 

[Rich]

Thank you for clearing that up Dock

 

[DHTiling]

Thank you for clearing that up Dock

Tell you wot rich... wot a chew to get a proper answer..:lol:

Yes it does reduce.. no it does not reduce.. then ye it does but only 3kg.. make ya blinking mind up i say..:lol:

 

[marko56]

Glad you guys have sorted out your issues:lol: I have managed to source some wedi board at a good price - some of the wedi board will come outside of the shower enclosure and won't be tiled - can wedi board be skimmed? Thanks again

 

[DHTiling]

Yes it can, scrim tape the joint


Sent from my iPhone

 

[Rich]

Tell me about it Dave, I was struggling to keep up through most of that!

At least the answer is clear and a good answer at that, shouldn't make a huge difference to how its used, yet another win by the forum, would be well stuffed without it

 

[davebates]

I went to mapei training day and and i can clearly remember them saying that it stays the same ater tanking

 

[dock]

Dave

I will talk to Chris - it can't remain the same as it is weight applied to the board so has to be considered in the overall scheme of things, as does the adhesive.

dock

 

[HardieBacker1]

Marko56,
I have just had a scan through the messages, here are some pointers......

1 - you want to plasterboard and then tank?
2 - you want to load heavy tiles
3 - you looked at backer boards but expensive.

Ok.. to the first one you can just use HardieBacker as 1 its impervious to water so won't breakdown like the plasterboard and 2 you don't need to tank the product.
HardieBacker can hold much more weight than plasterbaord. Our literature states it can hold 50kg m2, we have since done some new testing which has resulted in over 80m2 using a good adhesive.
HardieBacker is not expensive, if you use plasterboard and then tank that will cost more! plus you need the tanking to dry for 24 hours before tiling!

Hope this helps.

 

[doug boardley]

Marko56,
I have just had a scan through the messages, here are some pointers......

1 - you want to plasterboard and then tank?
2 - you want to load heavy tiles
3 - you looked at backer boards but expensive.

Ok.. to the first one you can just use HardieBacker as 1 its impervious to water so won't breakdown like the plasterboard and 2 you don't need to tank the product.
HardieBacker can hold much more weight than plasterbaord. Our literature states it can hold 50kg m2, we have since done some new testing which has resulted in over 80m2 using a good adhesive.
HardieBacker is not expensive, if you use plasterboard and then tank that will cost more! plus you need the tanking to dry for 24 hours before tiling!

Hope this helps.

got to disagree, water can pass through hardie backer boards.

 

[Rich]

I was under the same impression as Doug, the boards will not degrade with water but they will let water through them??

 

[HardieBacker1]

Doug and Rich,

I think you are both missing the point of what a backerboards job is to do.
Gone are the days when plasterboard was your only option as gypsum simply fails when exposed to water. Using products like HardieBacker gives you a solution as they are water resistant, therefore won't breakdown which can then result in your tiles dropping off the wall.
Also mold grows on the paper facing on plasterbaord which again breaks the product down. HardieBacker is mold resistant so again will always stay stable under these conditions.

So with this being said a backer board protects your tiles from failing in wet areas, which a plasterboard cannot do.
Water from a shower head will not 'pass through' HardieBacker if installed correctly.

Thanks

 

[Rich]

No, no. We understand fully what Hardiebacker is meant to do, we both use and recommend the product happily, we just didnt agree that the boards are "impervious to water" as water will pass through the boards if it comes into contact.

 

[doug boardley]

that's what I meant Rich

 

[marko56]

Ok - after plenty of faffing about I've now put in my studwork and am ready to fix my wedi board (2500x 625 x 12.5 - £22 + vat from CTD), however I've been quoted £40 + vat for a 10m x 120mm roll of sealing tape for all corners and where the boards meet - I'll need 2 of these to do the job - £96!!!!!:yikes: - that hurts! - any alternatives that will do the job as well - I know Wedi won't honour any guarantee if I don't use their tape but that is way too expensive - thanks again for your help.