Air gap?

[John J]

How many millimeters must the air gap be at a minimum?

 

[andersmc]

Which air gap? Where?

 

[John J]

Which air gap? Where?

Wall to be insulated with fiberglass or similar.

The stud is 2x4' and I was planning to insulate this entire space.

 

[andersmc]

And you should have an air gap between something windproof and the outer panel...? Well, 28mm should be fine.

 

[John J]

And should you have an air gap between something wind-protective and the outer panel...? Well, 28mm should be fine.

Hmm 5 mm then?



Seriously, I need to have the minimum since I've already exceeded the building permit size by 5cm.

 

[John J]

If I interpret this correctly, they have no air gap at all, can that be right?

http://www.stenull.paroc.se/produktdat/pdf_down/3044_Nr8_jan08.pdf

 

[andersmc]

You should not have an air gap INSIDE the wall, if that's what you're wondering about. However, you should have an air gap between the exterior gypsum board/asfaboard/wind paper and the panel. That is not included in the PDF you referred to. It only shows the inside of the already constructed walls.

 

[John J]

You should not have an air gap INSIDE the wall, if that's what you're wondering about. However, you should have an air gap between the exterior gypsum board/asphalt board/weather barrier and the paneling.
That's not included in the PDF you referred to. It only shows the inside of the already built walls.

No, of course, I shouldn't have an air gap inside the wall.

However, I interpreted the document as they installed insulation without an air gap in that old garage.