wet under floor heating system

[nvhelectrical]

Howdy all
I am renovating a full house but this one is going to be one for my family to live in. i can and have installed C/H systems before and have a lot of professional plumbers on back up (i'm a sparky by trade).
I understand the aluminum spreader plates are going to be the best to install but they are also pretty damn expensive, so is the foiltec any good as a alternative?
what about the foil backed kingspan is this a viable option to install under the pipe work then install noggins to support the pipes or is the heat loss to great or not spread evenly.
thanks for looking i would be grateful for any help or suggestion
neil

 

[Boilerman2]

The Aluminium plates "Conduct" heat giving an even floor temperature
foil faced insulation products such as Kingspan or Cellutex would not produce the same results - i'd go with the correct alloy spreader plates!
putting a UFH system right POST installation can be Very Very expensive!

 

[nvhelectrical]

another user (foxhole) has informed me that aluminum spreader sheets can cause hot spots and the 25mm sand cement screed is a better option.
what about weight issues? all floors (3) are suspended and fairly large areas would the i need a structural report to determine how much they can take. and how does the heat transfer through the sand cement mix

ta

 

[doitall]

If it joists use the plates.