I have the opposite experience. we've not put felt on any building's sheathing in the last 15 years I've been working at my current job. the closest we came was using square edge gypsum sheething on a steel structured masonry building.quote:
Originally posted by Amkeer:
Bret,
Never had problems with felt, ever. I have torn into very old homes with felt and the sheething was like the day it was installed. Now if you have a home that is not properly built no moisture barrier will help.
yes, yes and yes.quote:
Originally posted by drm7:
Is the felt on the outside of the wall instead of tyvek? I thought tyvek allowed water vapor to escape whereas tarpaper would trap the vapor, right?
the "whole house envelope" has created alot of today's problems. houses used to "breathe" (i.e. be drafty) so you didn't get the mold or radon problems.quote:
Originally posted by drm7:
I've tried to do some research on the whole "house envelope" thing and it is very interesting reading and actually seems to me like all the puzzles haven't quite been solved. I see ads from GP Gypsum now where paper on drywall can feed mold so they have some new line of drywall.
don't use the kraft paper, it's just not effective and too easily damaged. what you want is a vapor barrier (polyethylene sheeting), then your framing and UN backed insulation, then your sheathing then an air infiltration barrier (tyvek/typar, et. al.) having 2 vapor barriers (poly/kraft paper and rosin paper or felt) causes moisture to build up and tends to rot things from the inside out.quote:
Originally posted by drm7:
You put paper backed fiberglass insulation behind the drywall and a vapor barrier on the outside to allow moisture to escape w/o condensing inside the wall.