When can UFH be commissioned after tiling?

[Colour Republic]

So this is a question that has been asked many times on this forum.

So how long after fixing the tiles can you start to turn on the heating? This is from an addy point of view not taking into account the type of tile or grout.

[Dave]

Electric mat systems yes... and usually 14 days to commence slow warm up..

In screed heating then commission first..

[Colour Republic]

ok sorry my wording was wrong... I didn't mean commission I ment turing it on after installing the tiles

[Dave]

Then as above but do check with manufacturer of adhesive.

[Colour Republic]

would you turn on the UFH on after 24hours?

[Dave]

No way!!.. this can shock the adhesive before it has reached full tensile strength.

[Colour Republic]

alas Larsen don't seem to think so unless i'm reading it wrong

disclaimer: I'm not planing on doing this but is the very reason I didn't but the addy from a tile supplier recently because I didn't trust the data sheet


http://www.larsenbuildingproducts.co...e-fast-set.pdf

[Dave]

... say no more..

[Phil Hobson]

I am having a problem with this at the moment, this floor is in screed water heating. I layed a decoupling membrane over a month ago, having been told the heating had been commissioned. I later learned the floor had only been pressure tested, when they did fire up the floor weeks later. Instead of bringing the temp up gradually ( because there is no thermostat, it seems) the heat just went from 0 to full whack.


My problem now is, isolated areas of the floor are showing, what look like shrinkage cracks in the slc over the membrane. These are very small areas, but in two places it seems like the membrane has de-bonded with the sub-floor.


I have had the rep from Mapei down, and he thinks it could be thermal shock. He suggested I remove any loose areas of mat and replace. My gripe is why do the manufacturers of these heating systems not address the issue of having to commission the floor gradually, by not having a thermostat.

[Dave]

The heat on those piped systems are controlled via the manifold phil..

So why SLC over the matt..?.. was it a green screed,

[Phil Hobson]

The heat on those piped systems are controlled via the manifold phil..

So why SLC over the matt..?.. was it a green screed,

No Dave not a green screed, but I rang Mapei to ask as there was a bit of shape in the screed. could I use Trade plan latex slc to fill the mat (rather than using adhesive) and help level the floor. They said yes, the heating system is run from the manifold. I have been told that there is no way to bring it up slowly

[trevortine]

Hi phil, done quite a few of these in big extensions mainly through in edinburgh, temparture can be controlled by heat source, ie boiler. We used to run them up five degrees per day to max and then same on way back down.