Flooring question, concrete screed insulation

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Hi All,

I hope you are well. I need some advice please.

I have a concrete floor in my conservatory, and need to build it up to match the floor level of the kitchen.

I have 100mm to play with. I'd like to add inulation and screed.

Whats the best approach please, should i split it 50mm insulation and 50mm screed?

I'm worried incase 50 mm screed directly ontop of insulation may not be enough and may start to crack.

Also, will 50mm insulation be enough to keep the floor insulated?

I say its a conservatory but in reality it has a warm insulated roof, but windows and doors as walls.
 
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Hi, can anyone advise on this please? I would appreacite it so much
 
What were you planning on finishing the floor with?
I'd suggest more insulation and ply floor under whatever finish you were planning.
 
50 mm would be plenty thick enough for an Anhydrite (liquid) screed, you would just need to sand the latency off once cured and use an Adhesive such as Anhyfix if tiling.
 
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What were you planning on finishing the floor with?
I'd suggest more insulation and ply floor under whatever finish you were planning.


Im not sure as yet, but most likely tiling.

However id like to finish it with my options open laminate, tiling, or even carpet if ever needed
 
50 mm would be plenty thick enough for an Anhydrite (liquid) screed, you would just need to sand the latency off once cured and use an Adhesive such as Anhyfix if tiling.


Hi, thanks for the reply, will this be ok directly ontop of insulation?

Whats the best type of insulation i can use?

Ideally i would have liked to have been able to use 100mm insulation, but givent the restrictions i have , is there a superior 50mm insulation out there that maybe more costly in price but can match the thermal value of a 100mm celotex i wonder?
 
If you do decide to use a Flow screed, you need to "make a tub" over the insulation out of thick polythene. If you don't do this, the liquid will flow underneath the insulation and the whole lot will float on top!
If you have an existing concrete slab you would need to add a thin layer of soft sand over it as a blinding layer, then some decent thickness DPC polythene, then your insulation boards packed in nice and tight. Once this is done some more polythene can be laid but cut oversize and taped up the walls by about 6 inches to create the "tub". Old school tilers are often not keen on anhydrite screeds but trust me, if you sand the scum layer off (latency) and use Anhyfix, the tiles will not be coming up any time soon! I had to break one up after cracking it (vid below).

 

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