Discuss New Build UFH Tiling in the DIY Tiling Forum area at TilersForums.com.

J

John Wingfield

Hi all

First post on here as need some advice. We are building a house and have got to the point where the floors need tiling.

The floor is a sand and cement screed that was NOT poured. It has been in the house since August.
The screed contains water based UFH which has not yet been turned on / commissioned.

I am going to be doing the tiling - done plenty before in previous houses, but never onto a screed with UFH. The chap in charge of the build has stated that we need to use a decoupling membrane on the screed to stop the tiles cracking.

I dont believe this is required, as the screed has had plenty of time to dry out (5 months) and I will have expansion joints between each room between the doorways.

Just after others experience / advice on this topic?

Thanks
John
 
O

One Day

Your risk lies in the fact that the floor hasn't been commissioned.
Once commissioned, and cooled - the cracks, if any should happen.
If you are fixing a porcelain, or strong stone then you'll likely be ok - especially if you have bays and expansion joints in the screed already.
If you're fixing a weak stone - marble / travertine etc then definitely uncouple.

Look at the cost of a membrane - even Mapeitex (probably the cheapest option at the moment) and you weigh up - how much do I value my stone/tiles?
- am I prepared to risk it?
- is the extra outlay worth the piece of mind?

Many of us have fixed long-lasting floors without Ditra, but never onto uncommissioned screeds without Ditra.
 

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New Build UFH Tiling
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