Air gap

[Aja]

We have listened around the neighborhood and most seem to have used 2" * 2" and masonite.
Is it a luxury or budget option?
What is the cheapest versus the best?
So many of you know so much!

/aja

 

[Mjölnaren]

Where is the air gap located???
Wall, ceiling................

 

[Aja]

I forgot to mention... There are walls and ceilings on the upper floor of a 1½ story.

Didn't know there were air gaps in other places. :-[

 

[dymlingen]

I did the same, with masonite, and it feels quite solid.

There are insulation boards with a paper backing with folds that create an air gap. It may not feel as sturdy, but it saves a lot of time.

I chose masonite because I didn't have standard dimensions between the rafters. It was a hassle to fit the masonite pieces since the rafters were alternately fastened on different sides.

 

[Mjölnaren]

Placing boards for ventilation yourself can be tricky.
But by screwing a couple of battens between the two rafters (on the inside), you can secure the board at the outer edges with a couple of solid "wedges." After that, you just need to screw/nail the board in place.
Regarding 2"x2": Wider ventilation gap = Better ventilation.
Start with the boards from the highest point and work downwards so the overlap joints align correctly.

 

[ledighetskommiten]

Hardly budget or luxury. Rather quite ordinary.

 

[cubix]

I think this thing with air gaps is exaggerated. The dimension of the air gap is probably dependent on the type of construction and insulation material used. I myself have a house from '54. Wood shavings as insulation, and not a hint of an air gap or vent. Mold - no way. Glass and rock wool manufacturers usually recommend 25 mm, and I think that is more than sufficient.

 

[ledighetskommiten]

The glass and stone wool manufacturers usually recommend 25 mm, and I think that's more than enough.

In practice, yes. Often you need a little more theoretical air gap for it to actually be 25mm in reality.