What dimensions should we use for our subfloor

[pjop]

Hello,

we are in the process of turning our house upside down.
The plan is to
- change the layout on the upper floor
- glue in a parquet floor (40-60 cm long strips)
- install water-based underfloor heating.

To fit the kitchen under a window, we are considering lowering the subfloor, which is currently built up with
- Floor masonite
- Floorboards
- 13 cm floor beams with sawdust in between
This rests on a cast concrete vault.

Is it OK to instead go with
- Parquet
- Double floor plywood (masonite?)
- 7.5 cm floor beams with hanging floor heating plates
- Some thin insulation

Or how would you pros do it?

Thankful for a response

Petter

 

[imported_Byggaren]

It is perfectly possible to lower the subfloor if it rests on a btg.valv that is not in contact with the ground.

The material you call "Dubbel golvplaywood (masonit?)" is very likely a floor called Duofloor.
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Byggaren

 

[pjop]

Thanks for the answer Builder,

what is Duofloor? I tried searching for it but can't find anything.

- How much does it cost?
- What are the advantages compared to regular floorboards?

Petter

 

[imported_Byggaren]

Duofloor consists of two hard wood fiber boards (Masonite, which is a brand name) glued together with the wire side (grooved) facing each other, offset by approximately 2 cm in length and width, and beveled around the edges so that the offset functions like tongue and groove on a tongued board.

Advantages: Manageable size (approximately 1.2x0.6 meters). Requires a complete subfloor. Easy to install. Becomes perfectly smooth like a tongued chipboard of sawdust. Only builds up 8 mm in height. Intended for renovation. Holds up much better than so-called renovation plaster for flooring purposes and does not require joint spackling. Available in building supply stores, possibly under a different name than Duofloor, which is the original designation just like Masonite.
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Byggaren

 

[pjop]

Sounds clever.

-Where do I find and pay for these skivor?
-Are they suitable for gluing parquet onto?
-Do they work with hydronic underfloor heating?

P

 

[imported_Byggaren]

Sounds clever.

-Where can I find and pay for these boards?
-Are they suitable for gluing parquet on?
-Do they work with waterborne underfloor heating?

P

Go to a real lumberyard, and they will probably order them for you. If you lived nearby, I could have mentioned Högströms on Orust (which has them in stock). The cost today, I shouldn't really speak on, but I think you'll end up around 100-150:-/sqm.

Both yes and no. Suitable yes. But gluing parquet on??? You usually don't glue parquet on a subfloor regardless of what it's made of. It's instead laid loosely so that it can move due to thermal factors; otherwise, there's a risk it will buckle at the seams when the planks expand.

If the heat is underneath, yes. On top, you'll need to lay thin foam, a baffle of aluminum sheet with grooves for the pipes, and then the parquet on that. And even then, you have nothing to 'glue' the parquet on.
__________________
Builder

 

[pjop]

The idea is to install stave parquet and I assume gluing is the best option?

P

 

[imported_Byggaren]

The idea is to install stave parquet and I assume gluing is the best option?

P

I have never experienced gluing stave parquet directly onto the subfloor. And if you mean stave parquet with loose staves, they are usually nailed down with brads on sawdust-covered lumber felt without gluing at all. The staves are rebated and fit into each other like tongue-and-groove boards do. Whether you lay them in a Dutch pattern, herringbone pattern, or grid pattern.

But there are also parquet boards with glued parallel staves on them. Even with the Dutch pattern. But they are not glued to the substrate either.

You should therefore ask a parquet installer what they recommend.
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Byggaren

 

[pjop]

I might be expressing myself a bit unclearly. After talking to the seller at Casco, he says that it is possible to install the floor in the following way:
- Joists
- Grooved chipboard for waterborne floor heating
- Casco ProFlex or Elastic Plus
- The parquet

Could it work?

P

 

[imported_Byggaren]

I might be expressing myself a bit unclearly. After talking to the salesperson at Casco, he means that it's possible to lay the floor in the following way:
- Beams
- Routed chipboard for waterborne underfloor heating
- Casco ProFlex or Elastic Plus
- The parquet

Could it work?

P

I am not familiar with Casco's products in this case, but it certainly works with underfloor heating. What concerns me is that you plan to glue the long strips to the chipboard. I am doubtful that it works well because the wood in the parquet strips is hygroscopic and needs to be able to move with moisture and heat.
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Builder

 

[pjop]

Isn't that why you should use a rubber-like glue? It should allow movement in the wood, right?

P