Liquid screed for UFH

[Walshie]

HI all,

I have a reasonably large area to screed over UFH.

The pricing for liquid screed seems to be pretty good - only a few hundred more than concrete.

 

I like this as an idea, especially if I don't have to do it, it's more thermally efficient for UFH and it dries and is walkable faster than concrete.

It all seems great - but is there anything that I need to be aware of before I commit?

 

Does anyone have any recommendations for a supplier in the South West - I'm in Porlock, Somerset.

 

Thanks for your help,

 

 

Sean

 

[JohnMo]

Couple of ways to look at UFH.

 

1. Low and slow, so run at lowest temperature, to keep house temperature stable. For this thermal capacity of the floor is helpful.

2. Batch charge, using floor as a storage heater, again thermal capacity is needed.

3. Run like a radiator system, so thermal capacity acts against you. Here you low thermal capacity is needed and thin screed.

 

22 minutes ago, Walshie said:

it's more thermally efficient for UFH

So what do you actually mean by this?

[nod]

Liquid screed drys out much quicker than semi dry and works out about a third more expensive 

More thermally efficient than semi dry I wouldn’t think there would be much difference If any 

[BotusBuild]

I can recommend Screedmaster SW Ltd. We had the Cemfloor screed.

I let them lay the necessary DPM and foam edging. Not as neat as I would have done it but I'm a neat freak. 

Clean and accurate (level) pour.

[Walshie]

14 hours ago, JohnMo said:

actually

What I was getting at is whether a liquid screed will warm more quickly, hold heat better etc?

[JohnMo]

12 minutes ago, Walshie said:

What I was getting at is whether a liquid screed will warm more quickly, hold heat better etc?

The screed depending on specific heat capacity will do one or the other not both well.

 

Idea of concrete storage

Slab storage

 

For ~100 m² × 100 mm slab:

 

Concrete volume = 10 m³.

 

Mass ≈ 23,000 kg.

 

Heat capacity ≈ 0.88 kWh/K per tonne.

 

Storage ≈ 20 kWh per 1 K rise.

 

So find the heat capacity of screed and compare

[Walshie]

BotusBuild!

Thanks for the recommendation. I've been in contact with them and they have been great so far - very helpful and the quote is good too!

I was impressed with the information which they send over with the quote too - really informative and gives me faith.

 

Thanks for the recommendation.