Vapor Barrier, to be or not to be
![](https://images.finehomebuilding.com/app/uploads/2019/01/24124059/picture-727-profile-1x1.jpg)
Hi, Mike, welcome to Breaktime.
Do us all a favour and fill out your profile. That way when you post in the future, we can see at a glance what conditions you face.
IMHO, I think you want to have the VB inside. That’s where I put it, in thsi climate.
Quality repairs for your home.
Aaron the Handyman
Vancouver, Canada
Replies
Thanks Aaron. Will do re: profile.
How hot/humid does it get in Vancouver?
Hot and humid summers in philly. You dont know what hot and humid is till you survide a summer in the deep south
LOL!
It gets to about 28 on a really hot day and humidity can be at about 90Quality repairs for your home.
Aaron the HandymanVancouver, Canada
The vapor barrier goes on the inside. In Florida it might go on the outside, but not in Philly. (I lived in Pine Hill, NJ for two years, so I'm familiar with the climate.)
You are in a mix-humit region.
http://www.buildingscience.com/housesthatwork/mixedhumid/default.htm
Thanks for the link Bill. It was very helpful.
MikeAll you need for invention is a great imagination and a pile of junk.
Thomas Edison
inside.
Jeff
Buck Construction
Artistry in Carpentry
Pgh, PA
The vapor is created by cooking, washing, breathing, etc. The barrier goes on the inside to keep the vapor from moving to the outside where it can condense and wreck insulation or rot framing. Never put it on the outside or use two barriers. In tightly insulated homes with proper attic ventilation, we don't use one on the ceilings. Any knowledgeable insulation company will tell you the same. You are not in the tropics.
Beat it to fit / Paint it to match