How to insulate fluted joists?

[witten]

I think the Dalmasen interpreted the concrete as a TRP.

 

[Dalmas71]

I think Dalmasen interpreted the concrete as a TRP.

You are quite right about that... I asked about the sheet metal in a previous post... Didn't get an answer that it wasn't sheet metal, so I continued to believe it was. I thought it was concrete and TRP or a variant with composite decking... It's not common in residential buildings, but you never know who designs a property...

Concrete is not a vapor barrier, so there will always be moisture to some extent...

 

[oskarsch]

I describe it as "the concrete cassettes in the floor slab are ribbed" in the first post, and thought you were talking about "sheet metal" as some sort of technical term

 

[Dalmas71]

I describe it as "the concrete cassettes in the floor slab are grooved" in the first post, and thought you were talking about "sheet metal" as some sort of technical term

There is nothing to discuss.. I misunderstood you.. Drop it...

 

[Daniel 109]

You may realize that your statement is more applicable to someone else.....

Totally OK, you don't know what you're talking about...

 

[Dalmas71]

You may realize that your statement fits better on someone else.....

Still on you... What you claim is not true in all situations...

Is it important for you to be right and get the last word, or that the user gets help? You seem a bit unstable...

 

[Rabbithole]

So it's just concrete, excellent! Then it's just a matter of doing according to the picture you posted.

 

[Dalmas71]

It's just concrete, excellent! Then just do according to the image you posted

It's just concrete, excellent! Then just do according to the image you posted

Johannes.. User writes "ångspärr" in the image but links to ångbroms.. What did you think they should follow? Broms or spärr?

 

[oskarsch]

Meant ångbroms and confused the terms in the sketch.

Ångbroms is what I understood I was being advised about.

 

[Dalmas71]

I meant vapor barrier and got the terms wrong in the diagram.

Vapor barrier is what I understood I was being advised about.

I think a vapor barrier will work just fine for you... You have underfloor heating, say you're going to have a dehumidifier in the crawl space... Install an extra humidity meter so you can keep track.. (Battery-operated wireless little thing). Make sure to have a barrier against the ground...

 

[Rabbithole]

I was thinking about the one that TS linked to, and it's the type that insulation manufacturers usually recommend in connection with cellulose insulation. Vapor barrier, that is, the terms are often somewhat confusing.

 

[Daniel 109]

Vapor barrier works too, and is generally cheaper.

 

[Dalmas71]

A vapor barrier works too, and is generally cheaper.

The user benefits from the floor heating being able to heat up a part of the upper insulation and thus allow moisture to pass through the vapor retarder. Sure, moisture will also be drawn towards the colder part, but the heat carries moisture that vent takes with it... Did I read about Ftx somewhere or was it in another thread?

 

[Daniel 109]

No, there is no advantage to a steam brake.

 

[oskarsch]

No, there is no advantage with a vapor barrier.

So I shouldn't install a vapor barrier anymore?

The user has the advantage that the underfloor heating can heat up part of the upper insulation and in this way allow moisture to pass through the vapor barrier. Sure, moisture will also be drawn towards the colder part, but the warmth carries moisture with it that vent takes... I read somewhere about Ftx or was it in another thread?

Yep. Have FTX installed in the house.