How to fix draft from the crawl space in the best way?

[Ewald]

Hello!

What is the best way to address the draft from the crawl space on interior walls? Should one use expanding foam, or are more extensive measures required? ... and how much does it cost?

Is there anyone here who has had this problem and can share some insights?

 

[Larsa]

Drafts/cold drafts near exterior walls can be due to insulation settling, allowing the cold to find its way in under the floor. You can investigate if this is the cause, and if so, look at how you can supplement the insulation.

 

[Ewald]

It is right between two interior walls and the floor, and it is located a bit away from the exterior walls. But with most interior walls, there are no problems.

 

[Larsa]

It was strange, have you figured out where the draft is coming from? If it's a gap, foam sealant works.

 

[Ewald]

The draft comes from below and is only present in these places where the floor meets the interior walls.

 

[Överstyvt]

Do not seal with foam sealant, it expands and risks creating cracks in the wall covering or moving the moldings. Caulking cord or glass wool strips are better choices. Possibly latex sealant if it's difficult to press in the caulking cord.

I have the same problem, which is because it is not completely sealed between the wall sheathing and the subfloor, allowing cold air to rise from the crawl space.

 

[Ewald]

Do not seal with expanding foam, it may expand and risk causing cracks in the wall cladding or moving the moldings. Caulking or draught strips of fiberglass are better choices. Possibly latex sealant if it's difficult to fit the caulking.

I have the same problem which is due to it not being completely airtight between the rough-hewn wall and the floor joists, allowing cold air to come up from the crawl space.

Thanks for the tip! I'll keep that in mind!