Gypsum or Chipboard Floor?

[Kicken]

Planning to build a 1.5-story house with water-based underfloor heating on the second floor.

Choosing between two HVAC companies;
Supplier A is happy to deliver heat distribution plates where the water pipes are mounted, which work well with chipboard on top.

Supplier B wants the pipes laid in gypsum board flooring, meaning a layer of gypsum board + a layer where the pipes are embedded + another layer of gypsum.

Option A:
- Surface material
- Chipboard
- Battens 22x100, with water pipes in heat distribution plates
- Joists cc450

Option B:
- Surface material
- Gypsum board
- Gypsum pieces with embedded water pipes
- Gypsum board
- Battens 22x100
- Joists cc450

The price is about the same for both options.

The chipboard option is easier to do.

The gypsum floor will be quieter, I suppose, how big is the difference?

What do you think?

 

[gadu^]

Dumb question maybe, but why should you have a plasterboard over embedded pipes in Alt B?

 

[noone70]

Shouldn't option A provide better heat distribution due to the plates?

Now, I'm no expert on underfloor heating but option B seems more complicated than it needs to be. If it becomes quieter, it's probably marginal, as insulation likely has a much greater impact.

 

[Kicken]

Maybe a dumb question, but why should one have a gypsum board over embedded pipes in Alt B?

That's how it is usually done, it's probably to make it sufficiently strong.
But if one were to use something like a plywood board instead of furring, it would probably work too?

Can't find anything on Swedish Gyproc but there is on Finnish http://www.gyproc.fi/ratkaisut/lattiat/lattialammitys

If you have a thicker parquet floor or similar, you can omit the top layer.

 

[gnuttisch]

What do both suppliers say about the matter? Why should one choose one over the other?

 

[Kicken]

Supplier A offers the plates precisely because it is easier to install. But if we prefer to lay them in drywall floors in the same way as option B, they would deduct 1150€ (10000kr) for the plates (but that benefit goes to gypsum and filler).

Supplier A uses the brand Roth
http://www.roth-nordic.se/glespanel.htm

Supplier B claims that the plates can chafe the pipes, which I find strange since several manufacturers have plate systems. They use the brand Nereus
http://www.nereus.fi/lattialammitys/tekniset_ohjeet (Finnish)

 

[noone70]

The idea that the plates would chafe on the plates sounds like sales talk.

 

[gadu^]

If you have a thicker parquet floor or similar, you can remove the top layer.

That's kind of what I was thinking, and I couldn't figure out why you need a layer of plaster...