Tion, it was hard to see how water had leaked We looked carefully at the siding's installa. Where water had leaked under the unprimed The worstĭamage was around door and window openings and under clapboard joints, exactly Of their trim and clapboards, we stood backĪnd marveled (photo right, p. However, when my crew stripped this house's walls Past a properly detailed, standard siding job. You might argue that rain should never get Of wind-driven rain being forced or drawn Finally, this ventedĪirspace helps to equalize the air pressure onĮach side of the siding, reducing the chance Vented top andīottom, the siding has a way to dry from the The airspace in a rain-screen wall providesĪ capillary break, stopping water driven behind the siding by capillary action from ever Top of another, then to the wall sheathing, is
Long distances in this way, so a raindropĬlimbing the back of one clapboard to the Stalk of celery into a glass of colored water,Īlong a continuous surface. But it does nothing to address capillary action. The siding would do the same thing, and it isĪ good practice. Plane, minimizing any chance of extractiveīleed (sidebar facing page). The siding, typically clapboards, is nailed to these strips. This airspace is created byĪpplying vertical furring strips over theĭrainage-plane material.
Either one makes up what is called theĭrainage plane). I prefer #15 tar paperīecause of its century-old track record. The siding and the building paper or housewrap. Rain-screen walls have an airspace between Turn,the Ice&WaterShieldlapsthe tarpaperbelow.Ĭounterflashing covers step flashing, Ice &Water Shield and tar paper.The counterflashing is layeredover the lower clapboardto drain,while the upper clapboardstops Note how the tar paper to the rightof the opening laps over the top of the Ice &WaterShieldflashing. Reason why the one sure way to correct it was toīuild a rain-screen wall (sidebar facing page).įirst,flash vulnerable spots such as rough sills to drain water. To me the science behind the failure and the None of this surprised Joe, who explained Source of moisture to be rain that found its Pattern of wetting, coupled with the lack ofĪny interior moisture source, indicated the Furthermore, weįound no flashing deficiencies that could Ture source that could account for the damage and peeling paint. This belt-andsuspenders approach can contribute to the longevity of both Tar paper and flashings behind the furring strips create what isĬalled a drainage plane, which alone would protect the houseįrom water, even if there were no siding.
89, for more information about housewrap failure.įurringstrips space the clapboards away from the wall, creatingĪ vent space that helps to dry the back of the siding. Any rain that got past the siding soaked the sheathing, creating a reservoir that kept the siding wet and the paint Tannins leaching from the back of the cedar siding, which had not been back-primed, ruined the housewrap's water THE PAINT ON THIS HOUSE NEVERSTOOD A CHANCE There was no evidence of any interior mois. Both the clapboards and the plywood sheathing were saturated. Housewrap, soaked like blotter paper (photoīelow right). Off one clapboard revealed tea-colored Tyvek Wrong if we can pull one clapboard." Pulling When Joe saw the house about a week later, he said, "I'll tell you in two minutes what's Homeowners agreed when I suggested calling in a consultant, Joseph Lstiburek. Jittery about hiring yet another painter, the Was done only two years before, I knew that When I learned that the previous paint job Even more alarming, the paint peeling from the walls was The sheets of paint dangling from the cedar I was there to bid on painting the eight-year-old, multimillion-dollar home. Spacing the siding away from the housewrap promotes ventHation andĭrainage for long-lasting siding and paint
TABS RAIN SCREEN WRAP ON BLOCK WALL INSTALL
Rain-Screen Walls: a Better Way to Install Siding
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