Get vapor barrier tight around wooden stud?

[mikle]

I am decorating the upper floor of villa Nybro from Smålandsvillan. I am contemplating the diffusion/vapor barrier and how to make it airtight everywhere.

In some areas, I intend to insulate down to the eaves, which presents problems with the support beams passing through the plastic sheeting. What is the best way to ensure the plastic is airtight around these, and how should the plastic be cut for a good overlap?

My idea is to cut a long slit and then draw the plastic with the support beam through the slit. Then make a corresponding slit in the overlapping piece and pull it the other way past the beam and tape the slit with appropriate tape. That should seal the seam, right?

Then there's the problem of sealing the "collar" around the support beam. How would you handle that?

I'm also pondering a bit about how to best wrap the plastic around the chimney pipe.

 

[mikle]

No tips on sealing?

 

[storkarp]

I sealed around duct pipes through a frame of 45s that I filled with foam sealant. Other seals were made by folding up the plastic a bit on the wood, stapling and taping a bit extra if needed. I'm not 100% satisfied with my sealing. Hopefully, a 98% seal will still provide a sufficiently good effect.

 

[Tiger79]

Around stove pipes there are special sealants. Check with the chimney manufacturer.

 

[JOW]

Clamp it with a läkt/list.

 

[Forbo]

Check the manufacturers' websites for assembly instructions, there are a couple of different ones...in one of the instructions, I found a template for just the support legs and sealing around the intermediate floor, etc...it was quite clever. (Then it's still a bit tricky and I also used silicone around and in the joints for maximum sealing.)