Tilling on a floor with Karndean already on floor & underfloor heating - TilersForums.com

[ythan]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

Ajax - are you also going to take up the ''weak'' screed and the electric underfloor heating?

who is going to pay for all this???

 

[raylincs]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

Hi everyone again thanks for taking the time to answer my post.
The underfloor heating never goes above 25c so that shouldn't impact the glue line (glue is Karndean's own for underfloor heating, so I will check their temperature threshold), also the tiles should disperse any temperature build up, I would have thought.
The customer of course is hoping for the Karndean to be taken up, and all the problems and costs this would entail.
I take pride in my work and rely on repeat business, so in a fix about this job.
Thx

 

[peteablard]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

Hi everyone again thanks for taking the time to answer my post.
The underfloor heating never goes above 25c so that shouldn't impact the glue line (glue is Karndean's own for underfloor heating, so I will check their temperature threshold), also the tiles should disperse any temperature build up, I would have thought.
The customer of course is hoping for the Karndean to be taken up, and all the problems and costs this would entail.
I take pride in my work and rely on repeat business, so in a fix about this job.
Thx

If the customer wants it taken up then why are you asking about leaving it down?

 

[raylincs]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

Sorry missed the word Not, out..
The customer of course is hoping for the Karndean NOT to be taken up, and all the problems and costs this would entail

 

[ythan]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

if cost to the customer is no problem, then it's all down your own professional responsibility.

and if your customer is pleased & can put your way other customers, that also do not consider cost, then you've have even more professional responsibility and plenty of work.

beware damaging the electric underfloor heating.....

talk to your customer and get him/her to agree to what you recommend doing.

 

[Ajax123]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

Ajax - are you also going to take up the ''weak'' screed and the electric underfloor heating?

who is going to pay for all this???

I am not going to be taking any of it up at all.

If I were i would know that it would not be necessary to take up the weak screed or the heating cables. If necessary this can be repaired using a stabilising epoxy. However you should also ask yourself who is going to pay for it if it fails.

It is worth thinking about the fact that karndean is relatively flexible and elastic so will cope better with the rigours of a mobile screed. If it is weak then it will be more mobile than a correctly made and laid screed. A rigid tile face may not cope as well.

I just think this has problem stamped in big bold letters on it based on the info so far.

 

[Ajax123]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

Hi everyone again thanks for taking the time to answer my post.
The underfloor heating never goes above 25c so that shouldn't impact the glue line (glue is Karndean's own for underfloor heating, so I will check their temperature threshold), also the tiles should disperse any temperature build up, I would have thought.
The customer of course is hoping for the Karndean to be taken up, and all the problems and costs this would entail.
I take pride in my work and rely on repeat business, so in a fix about this job.
Thx

Does the room ever get warm?? The 25degrees will presumably be the surface temperature based on the room temperature of about 20degrees. As it is electric it will presumably have a floor stat which measures the surface temperature. If you overlay all this with a tile you WILL increase the core temperature of the screed. If you are certain of your facts about the temperature then fine but I would need a little more info personally.

If you take pride then don't take risks. Do it properly.

 

[ythan]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

I am not going to be taking any of it up at all.

If I were i would know that it would not be necessary to take up the weak screed or the heating cables. If necessary this can be repaired using a stabilising epoxy. However you should also ask yourself who is going to pay for it if it fails.

It is worth thinking about the fact that karndean is relatively flexible and elastic so will cope better with the rigours of a mobile screed. If it is weak then it will be more mobile than a correctly made and laid screed. A rigid tile face may not cope as well.

I just think this has problem stamped in big bold letters on it based on the info so far.

Yes, OK, Ajax there's risk/cost all around - hence the need to discuss it professionally with the customer and agree what's to be done.

sounds like you would be willing to take all the risk yourself of not damaging the screed and the under-floor heating when removing all the karndean etc.

what % of cost do you think removal of the karndean would be?

 

[Ajax123]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

It depends really on how difficult it is to remove. A hot air blower would make it significantly easier. You can hire a striping machine but I don't have any experience of ths personally.

Just a question... How do you know it to be a weak screed??

 

[raylincs]

Re: Tilling on a floor with Karndean already on floor & underfloor hea

Hi Ajax123
The customer has told me that the new extension which is two thirds of the tiling job, was a nearly dry sharp sand and cerment weak mix, laid on the electric cable underfloor heating, to a depth of 70mm. The a self leveling screed laid on top of that.
1/2 of this job is a kitchen with an island units, display units. A utility room and a sun room.
I think taking up the Karndean will take days even with a heat gun as the adhesive is heat resistance for underfloor heating.
Thx