Insulation board selection

[Tiling&bathrooms]

Hi all, some advice would be helpful here. I have a job coming up with natural stone. Part of the floor is being heated with a 12m2 mat. The substrate is a 20yr old concrete screed. My question is my insulation board choice. The mat will be a 200 pro warm mat. I believe that a 6mm board would be the best choice as I want to limit how much the level is raised. My usual suppliers are quoting around ###### a board (0.72m2) which are the cement skimmed foam boards however I am seeing several online retailers selling the foam only board which say that are suitable for my project at only #### a board (0.72m2). This obviously represents a good materials saving if they have the same properties as the higher priced ones.

Anyone used the blue or orange foam versions and will they do the job well if I fix them with a flex adhesive then fibre latex over the mat prior to laying the limestone?

Your thoughts are appreciated. Cheers



*****Edited by admin- no prices allowed in open forums please*****

 

[Ajax123]

how many square meters you doing

 

[One Day]

They're garbage and after faffing around trying to stick your mat and after compressing all over place, you'll wish you spent a few extra quid!

 

[Ajax123]

They're garbage and after faffing around trying to stick your mat and after compressing all over place, you'll wish you spent a few extra quid!

I agree but I was wondering how many square meters... if its 12m2 then the OP is querying maybe £90... not really worth quibbling about IMO. Spend the extra do it with proper gear and avoid having to revisit the site later when it fails....

 

[Tiling&bathrooms]

12m2 mat but area is 26m2 so instead of using so much latex I was going to board the whole area hoping for a similar cost anyway and additional thermal benefits versus just latex

 

[Uheat - Jake]

XPS Insulation would be fine for you're project and would give you better U-Values then a cement based backerboard. If it's a high quality XPS Insulation then you won't have the problem as Impish mentioned of them compressing. We've sold over a million of the 6mm XPS and haven't had one issue with them.

 

[Tiling&bathrooms]

What tech requirements please? Regarding adhesive primer etc?

 

[Uheat - Jake]

What tech requirements please? Regarding adhesive primer etc?

We recommend to prime the floor first, preferably a thermal primer. The boards then need to be stuck down with 2mm flexible tile adhesive.

 

[Tiling&bathrooms]

Super. Prime the boards before UFH mat and latex self levveller? Cheers

 

[Uheat - Jake]

Super. Prime the boards before UFH mat and latex self levveller? Cheers

Boards can be primed before mat and then 6-8mm slc over the top of the cables. Give me a call, I can sort you out a price for this project.

 

[Flintstone]

I used the blue un coated ones earlier this year on a 40m ufh job and they were crap compared to coated boards. I didn't supply materials so had to use them. Go on eBay and search Jackoboard, some decent deals on.

 

[Qwerty]

Im sure @Uheat - Jake can work on a price to try and compete with anything online

 

[Rookery]

I've used the blue stuff once, supplied by the customer. Utter garbage. I would only ever use the cement faced Tilebacker from CTD which is always easy to get, inexpensive and they'll deliver it for me along with the sticky and other stuff. Just remember, 10mm boards are only 4mm thicker than 6mm ones but give you twice the insulation. For little extra money.

 

[Chalker]

I would pay the extra for quality.

Lest say they are £3 a board more . That's about £90 on the job. Not worth the hassle.