Concrete Floor - Make Up

[richo106]

Hi 

 

I am planning our renovation starting in the next couple of months or so

 

I started another topic regarding my new concrete floor make up, currently my property is joisted and floor boarded with a decent sized void beneath (need to take measurements once flooring is up)

 

The planned make up is: 

 

200mm Type 1 MOT

50mm Sand Blinding

150mm Concrete slab

200mm PIR insulation

UFH Pipes

50mm Screed

 

So total depth around 650mm, there is 2 DPM layers also

 

Some comments and research have suggested their could be better ways to do this but i can't find a definitive answer

 

I would really appreciate some advice/information and some potential floor make ups, We will be using wet UFH with ASHP for heating throughout

 

Thanks in advance

 

 

[Nickfromwales]

50mm of screed is very little if this is to be a low energy dwelling. To take advantage of different types of energy consumption and to maximise efficiencies, I am always an advocate of a bigger slab so you can store slow release heat energy in it. I would dial back the type 1 to 150mm depending on how much you 'need', reduce the sand blinding layer to 20-30mm, install a sacrificial 25mm EPS layer atop the sand, and then the DPM. 

That would allow you to get closer to 80-90mm of screed which will then act more like a storage heater than a radiator.

 

In absolute honesty, I would flip the whole lot on its head if it were my place, and have the 150mm of concrete as my heated ( and cooled ) slab with the insulation atop the type 1. 

[tonyshouse]

You say :-

200mm Type 1 MOT

50mm Sand Blinding

150mm Concrete slab

200mm PIR insulation

UFH Pipes

50mm Screed

 

I would go thinking top down :-

 

75mm Screede, 150mm concrete, dpm/vb, 300 EPS, no sand blinding compacted recycled crushed concrete.