Help! SLC fail - Self levelling compound failed Pro 50

[Budha7]

This is why the forum is so good, so much info.
From now on I will be glueing and screwing..

i hope this stat can give me some much needed info.
it appears from the general consensus that it is thermal shock, I just need to find out how/why/who..

 

[Budha7]

Geoff, I'm not disputing at all.
on the flooring section, marmox says use adhesive steps 1 to 4, I think.
Then it says screw flooring, separately as step 1. Implying that screwing is another form of fixing as oppose to glueing and screwing.

 

[Budha7]

Purely, for gathering info.

 

[lizzardtong]

I always aim for overkill.

 

[thompsonbrown]

Did you position heating probe in correct position also did you use less than 100w psm heating kit.

 

[Budha7]

Hi
Yes probe was installed as per warm up instructions.
I believe the warm up loose wire to be 150w per mtr, but don't quote me on that.

 

[thompsonbrown]

Hi
Yes probe was installed as per warm up instructions.
I believe the warm up loose wire to be 150w per mtr, but don't quote me on that.

Max wattage for a suspended floor (wooden 100w). In my personal opinion this isn't the reason for your failed floor. However Manufactures will differ.

 

[Budha7]

Does using an insulated backer board not dispell the fact that it is on timber (wattage), as the heat is forced up through the tile instead of down into the timber?

 

[Budha7]

I'm not being awkward! Just asking.

 

[Budha7]

Sorry...It's late...

 

[One Day]

Max wattage for a suspended floor (wooden 100w). In my personal opinion this isn't the reason for your failed floor. However Manufactures will differ.

That recommendation though is assuming a direct fix to timber. All manufacturers will ignore the use of insulation boards on timber just to avoid any potential issues, so it's always 100w for timber, 150 for concrete (who the flip fixes ufh to concrete anyway?!)

 

[One Day]

Sorry I'm thinking of floating... It's late...

Floating? Oh Ohhhh!

 

[Budha7]

Ha ha! Sorry, It's a late and a few beers on board, I'm off to bed....
i should of just deleted it!

 

[White Room]

Know your substrates before tiling....

 

[Rich Midge]

Anything resolved yet? Over the last 18 months I couldn't tell you how many fails I've heard about regarding Norcros in N Wales. The latest reason they provided for a failed floor, cheap European timber being used in the construction not quality British wood! This was a new build they'd been out to spec. I've had pro 50 fail twice, looked almost like curdled milk the next day. They told me I hadn't primed the floor correctly! It was only after the main contractor, who was putting alot of money through Norcros, had the pro 50 independently tested that they admitted there was some kind of contamination in the powder before it left the factory. I'll never use Norcros powders again, shocking performance from there products and absolutely no backing from there customer service