Additional tanking required ?

[duncan_ellison]

Hello,

This is my first post here.

I'm doing a wetroom for the first time and have tried to follow all the advice given here before posting.

I've tanked the floor of the room and up to 100mm around the walls using Contour Bitumen Self Adhesive as advocated by a number of posters here.

The walls are Aquapanel on stand off battens and glued together using genuine Knauf adhesive as recommended.

The tiles will be plain white gloss ceramics (from Homebase) held with waterproof latex adhesive.

I was going to leave it at that, but some posts I saw seem to advocate additional liquid tanking on the Aquapanels. Does anyone think this is really necessary ?

Duncan

 

[Ian]

Aquapanels do not need extra tanking as you say. What is the brand of the adhesive you mention? Is it ready mixed or a 2 part latex adhesive? Either way a cement based flexible adhesive would be more than sufficient for your job.

 

[jay]

Aquapanel is water resistant and will not stop water passing through it so yes waterproofing is required if you want to protect the substrate http://www.google.com.au/url?sa=t&rct=j&q= aquapanels pdf cement sheet&source=web&cd=1&ved=0CCgQFjAA&url=http%3A%2F%2Flaminex.com.au%2Fuploads%2Fbrochures%2FAquapanel-Installation-Guide.pdf&ei=jHMmT8LsAeOUiQf38djuBA&usg=AFQjCNGmvpyhidPuZtJvWm5zyWMNJKfqDw

 

[Ian]

I've got a different page here Jay, AQUAPANEL® Cement Board by Knauf USG Systems | products interior en no mention of extra tanking on this one, unless I've missed it. As far as I'm aware (and I have spoken to a technical guy at Knauf) so long as all the boards are joined in the correct manner, it creates the perfect environment for a wet area.

 

[jay]

This one states its 100% water resistant http://www.google.com.au/url?sa=t&r...g83eBA&usg=AFQjCNH9M0JIikSus2gd3MV2BVKII5dKgg

 

[Ian]

I've just given Knauf UK a call and they have confirmed that additional tanking is not required providing the boards are jointed using the correct aquapanel joint adhesive.

 

[duncan_ellison]

Hi Guys, Thanks for the quick replies.

Seems like Jay is looking at a different 'Aquapanel', the one I'm using is an engineered cement board product made by Knauf.

I gave the tanking membrane company (Contour) a ring and they said that as long as the membrane comes up about 100mm and forms a complete 'tray' there should be no need for additional tanking on the Aquapanels.

So the consensus seems to be that it should be OK without additional tanking.

Bri : I've not chosen the tile adhesive yet but it will be a one part mix-it-yourself flexible water resistant variety, not the ready mixed stuff.

I do have another question about fixing Aquapanels, but I'll start a new thread on that.

Best ... Duncan

 

[jay]

I've just given Knauf UK a call and they have confirmed that additional tanking is not required providing the boards are jointed using the correct aquapanel joint adhesive.

Cant argue with them then its there product looks like i was wrong sorry

 

[Ian]

Cant argue with them then its there product looks like i was wrong sorry

I'll be honest Jay, the post you put up got me really worried as I've fitted 4 wet rooms in recent months without tanking the boards, that's why I phoned them. I'll get hold of an offcut and see how long it takes for water to pass through it (if it does). If it needed tanking then there isn't really a market for it, because you may as well buy cheaper plaster board and tank that.

 

[jay]

I'll be honest Jay, the post you put up got me really worried as I've fitted 4 wet rooms in recent months without tanking the boards, that's why I phoned them. I'll get hold of an offcut and see how long it takes for water to pass through it (if it does). If it needed tanking then there isn't really a market for it, because you may as well buy cheaper plaster board and tank that.

Thanks the other post i thought was a clear answer but when i re read it its prob not clear

 

[Mike]

I've got a different page here Jay, AQUAPANEL® Cement Board by Knauf USG Systems | products interior en no mention of extra tanking on this one, unless I've missed it. As far as I'm aware (and I have spoken to a technical guy at Knauf) so long as all the boards are joined in the correct manner, it creates the perfect environment for a wet area.

you mean with tanking tape bri or do you use something else?

 

[Perry]

This is why i was telling you to use backerboards Duncan they are waterproof

 

[Gazebo]

aquapanel is water resistant, meaning it will not expand or contract, break down or crumble when moisture/water is added to d it.

It is not waterproof like a wellington boot, hence it is only suitable for timber framed walls, (stud) they then state that the moisture that enters the board can then disperse in the stud cavity.

if you want waterproof then you need to tank it.

to be honest aquapanel that is fixed with correct screws and jointed correctly will suffice in most situations.

if you want real peace of mind then use marmox/wedi and joint it.

or plasterboard and a liquid membrane.

ps. be sure not to breath in when cutting aquapanel.......

 

[timothy brain]

wedi board does not need tanking wich eliminates your problem and leaves you with a water proof instalation,only the joints need to be sealed this is a quick and easy solution.