Installed by Side-Pro Exteriors across Seattle, Bellevue and Tacoma
The reason to specify WeatherSmart is not the sheet. It is the warranty behind the wall it goes into.
WeatherSmart is Henry’s polymeric housewrap — mechanically fastened, and an air barrier once the seams are taped. On its own it is a competent wrap. Paired with a Henry flashing and a Henry sealant it becomes part of the 1-2-3 Moisture Control System, and Henry will then cover materials and labor for fifteen years if a leak traces back to a product failure. That is a materially different promise from a warranty that replaces a roll of housewrap.
Its vapor permeability is 8 perms — noticeably tighter than Tyvek at 56 or Typar at 11.7. That is a design decision rather than a defect: a lower-perm wrap slows outward drying, but it also slows inward vapor drive. Which you want depends on the wall, and we would rather talk it through than pretend one number wins.
Henry publishes a six-month limit on UV exposure before the cladding goes on. On a Seattle or Tacoma re-side that runs long through a wet winter, that limit is the thing worth watching — and it is the figure most often left out of a product description.
We install it on homes and light commercial buildings from Seattle and Bellevue down through Tacoma.
DuPont Tyvek · Typar BuildingWrap · Jumbo Tex building paper · Henry WRB range
One correction to what you may read elsewhere, including on this page until recently. WeatherSmart is often described as offering higher vapor permeability and improved resistance to surfactant-induced water entry. Henry publishes neither claim in testable form: permeability is 8 perms, the lowest of the three wraps compared above, and the surfactant resistance is stated without a test method or a result. If you are cladding in cedar or redwood, ask us about it specifically — tannin-driven surfactant water entry is a real failure mode, and it deserves a real answer rather than a marketing line.