Why do you nail into the vapor barrier...

[sepani]

Have renovated the loft, replaced insulation, installed a new vapor barrier, and the old one was completely perforated. Among other reasons because they installed ceiling tiles in the rooms and nailed them right through the vapor barrier. Is this common? Shouldn't you be careful not to damage the barrier? I guess the previous owner was mostly concerned with keeping costs down…completely sore in the knees after replacing the old vapor barrier. To get it right, I need to tear out all the ceilings. But what do you do then? Glue?

 

[SueCia]

[image] [image] Have renovated the loft, replaced insulation, installed a new vapor barrier, and the old one was completely perforated. Among other things because they had installed ceiling tiles in the rooms and nailed them right up through the vapor barrier. Is this common? Shouldn't you consider not damaging the barrier? I can imagine that the previous owner mostly thought about keeping it cheap…completely sore in the knees after replacing the old vapor barrier. To make it right, I need to tear out all the ceilings. But what to do then? Glue?

Tear down the ceiling and battens, place plastic, nail battens. Then nail the ceiling with nails that go through the battens but not through the plastic.

Or you could just leave it as is

 

[sepani]

Tear down the ceiling and furring strips, apply plastic, nail furring strips. Then nail the ceiling with nails that go through the battens but not through the plastic.

Or you can just leave it as it is

Just leave it… don't have furring strips, just solid råspont…

 

[Rickard.]

A vapor barrier does not need to be 100% sealed under pressure and yes, it is very common for it to be nailed through, screwed through, and generally poorly installed compared to what the average buildahouse member believes is standard.

 

[SueCia]

If I were to post a picture of my vapor barrier (70s house), some people might have trouble sleeping

"Here we need to go through with a 100 pipe, better make a 500mm long cut just to be safe!"

 

[tergo]

In the 70s, vapor barriers weren't very crucial; it wasn't until around the late 70s to early 80s that overlapping and taping started to become important.

 

[Fotografen]

...at the same time as the isolation began to thicken...

 

[Rickard.]

in the 70s, vapor barriers were not as stringent. It wasn't until around the 70s-80s shift that overlap and taping started to become more stringent

The overlap is more precise today, but tape is still used quite sporadically on regular constructions. Overlaps that are clamped in one way or another are the best.