Insulate concrete porch

[Lindgrenski]

But I will also insulate the underside since the basement is below the veranda.

 

[huggan]

If you are going to use plastic, it should definitely be over the cellplast. How warm is it in the basement?

 

[Lindgrenski]

If you're going to have plastic, it should definitely be over the cellplast. How warm is it in the basement?

Around 8 degrees it should be.

 

[Rabbithole]

Lay PIR insulation and skip the plastic.
58mm PIR is equivalent to 100mm S80 EPS

 

[Lindgrenski]

Have framed and insulated the walls now and was going to tackle the last 45 for the electricity. Should I place the sill at the bottom with tar paper underneath as usual, or should I place it higher since the floor will be built up around 100mm? If I put it at the bottom, it will end up below the plastic along with the cellplast.

 

[Rabbithole]

Had laid the floor insulation first and then the 45 on it

 

[huggan]

Agree with the previous. So you can nail the floorboards then.

 

[Lindgrenski]

Now my brother-in-law came by and said that I don't need to put any insulation in the floor except possibly a few cm along with the underfloor heating, if I put some foam boards in the basement ceiling. It would be nice to avoid raising the floor a lot, but is it that smart?

 

[Rabbithole]

It doesn't really matter that much. It gets warmer in the basement. Do you have a radiator there?
Insulate as much as you can without creating strange level differences.

 

[Lindgrenski]

No heat in the basement at the moment. Additionally, it's like a vestibule to the basement under the veranda.

 

[Lindgrenski]

Leaning towards going with Flooré 25mm, so there will be some insulation at least.