Insulation options

[Dallelkpg]

Hello

I'm planning to start insulating my upper floor soon and I'm not quite sure which option to choose.



Option 1: The red line, insulating the entire roof into the attic.

Option 2: Yellow line, insulating down the wall and keeping the attic uninsulated.

According to the design from the home suppliers, they do it according to option 2.
One of the neighbors did option 1 and thought I should do the same.

Are there pros and cons to each option?

/Best regards, Mattias

 

[Ola78]

I agree with your neighbor, option 1. But it's enough if you insulate in the sloped ceiling down to the knee wall and then insulate a thick layer in the crawl space. That's what I did in our house. Check out, for example,

http://www.isover.se​

where there are instructions for insulating an unfinished upper floor.

 

[Dallelkpg]

Hello

OK, but just insulating the sloped ceiling down to the knee wall sounds like a silly idea?
Then you have a cold space right behind the drywall in the knee wall?

That sounds similar to option 2 except you skipped insulating the wall?
The attic space is already insulated in the floor joists.

/Mattias

 

[Ola78]

I was a bit tired when I wrote my first post, meant option 2, sorry :blushing: it was a bit carelessly written by me. I insulated the slanted ceiling down to the support beam wall, nailed additional studs on the support beams and insulated between them and also insulation on the floor in the attic crawl space. The thing is, I'm in the process of renovating our house from the 1920s, so I built new support beam walls where I laid in the thickness I wanted, then plastic, then horizontal 45*45, tongue and groove boards, and finally plasterboard.