DIY first floor underfloor

[mark138]

I’m considering replacing my first floor radiators with underfloor. I had an idea to attach underfloor heating pipe to the underside of my existing floorboards. I’m thinking it would be cheaper and less wasteful than removing the floorboards and replacing with a proper system like Omni Torfloor. Given it’s upstairs I’m not worried about insulation under it.

 

Curious if this is a really bad idea or reasonable compromise to make it affordable?
 

Are foil diffusers worth it or could I get away without? 

 

Planning to do heat loss calculations but haven’t yet.

[HughF]

You’ve got so many options….. personally, I’d look at something like the torfloor2 system as I really like the technical aspects of it. 
 

If you have access from below then you could use spreader plates but they seem a bit 2005….