Floor Screeds

redonly

Trying to decide on what type of floor screed to use with UFH. I have been researching self levelling types like Screedflo/Easyscreed both from my research are not concrete based i think (from what i can gather this is a good thing, no cracking etc):

Are they as good as the salesman says they are?

Whats the difference between the two above?

whats would be the recomended depth to use?

Is there any major cons as only pros on websites!!

Mellor

A couple of regular users have direct experience with some of these screeds, so i'll let them go into details of pros and cons.

but, you are correct, they aren't (traditional) concrete based. They come in a few different forms, which can be laid to various min thicknesses (5mm-25mm minimum bonded)

The two above are entirely different afaik. One being Anhydrate (sp?) based and the other based on something different (name escapes me).

As for requirements such as minimun thickness, curing times, refer to manufacturers date. Also check IAB certs, which should have key points outlined.

One cons would be reduced tolerances, and stricter prep needed I think.

sinnerboy

redonly wrote: »

Trying to decide on what type of floor screed to use with UFH. I have been researching self levelling types like Screedflo/Easyscreed both from my research are not concrete based i think (from what i can gather this is a good thing, no cracking etc):

Are they as good as the salesman says they are?

Whats the difference between the two above?

whats would be the recomended depth to use?

Is there any major cons as only pros on websites!!

yes

don't know - think they are same

35-40mm

cons
costs at least double vs regular screed
cant be used in permanently wet spaces
very poor mechanical resistance - get your tiling / carpet / timber flooring down ASAP after pouring

big advantage - UFH does heat up much faster

redonly

Thanks lads for the info it looks like i will go with ground floor 120mm kingspan or xtratherm insulation and 40mm screed and first floor 50mm insulation and 40mm screed.

By the way what is a permanently wet space?

sinnerboy

redonly wrote: »

Thanks lads for the info it looks like i will go with ground floor 120mm kingspan or xtratherm insulation and 40mm screed and first floor 50mm insulation and 40mm screed.

By the way what is a permanently wet space?

a wet room - where you don't have a shower tray but instead a floor drain under the shower

redonly

What is the best way to put engineered floor over anhydrate screed floor with ufh......float or stick? From what I gather moisture is a major problem with these screeds