Hardiplank siding that sweats
Hardiplank siding that sweats
(OP)
Why Does horizontal Hardiplank siding develop vertical sweaty appearance on so many houses in the Houston TX area.
These sweaty areas turn green and appear to be a type of algae, which has to be removed by pressure washing every year.
Does this have something to do with lack of moisture barrier paper or something to do with the studs?
These sweaty areas turn green and appear to be a type of algae, which has to be removed by pressure washing every year.
Does this have something to do with lack of moisture barrier paper or something to do with the studs?

RE: Hardiplank siding that sweats
I believe that it has something to do with the relative porosity of the material and acrylic paint combination.
A solution may be to seal before painting with a suitable waterproof sealer and/or use oil based paint rather than acrylics (which allow moisture to pass through them).
RE: Hardiplank siding that sweats
Me, I'm going to invest in vinyl. The homeowner's association will fine me for doing so, but it will be money well spent, IMO.
Good luck
Ben T