![]() Is DELTA®-DRY a water resistive barrier ? However, it absorbs far less solar heat radiation than conventional building paper. Although DELTA®-DRY is grayish-silver color, it does not act as a radiant barrier in the wall system. While the special high density polyethylene can prevent the movement of air through it, the way it is detailed and the necessity for ventilation does not permit it to be designated the air barrier in the system. DELTA®-DRY is not an air barrier in the wall system. When it is ventilated, it cannot form the continuous barrier that would be necessary to act as a vapor barrier. While it is true that DELTA®-DRY is impermeable to water vapor, it must be ventilated. ![]() DELTA®-DRY doesn't act as a vapor barrier in the system. The water vapor pressure increases within the cladding and the vapor pressure differential forces the moisture to move inward where it can wet the structural components of the wall if there is no barrier to prevent it. The moisture remaining on the surface evaporates, but the moisture within continues to heat up as the sun continues to heat the cladding. The sun then hits the surface of the cladding and begins to heat it up. ![]() Water from sources like rain, snow or lawn irrigation is sprayed onto these claddings that easily absorb it. Solar-driven moisture is an effect that occurs on absorptive claddings such as conventional stucco, manufactured stone, natural stone, clay brick, and cement board siding. The better the ability of a system to cope with moisture, the less likely the moisture is to cause decay, rot and mold in the wall. The higher the drying capacity of a wall system, the better the system is able to cope with moisture within it. What is “drying capacity” and why is it important?ĭrying capacity refers to the ability of a wall system to manage and rid itself of water and water vapor. While trim and/or a drip edge may be necessary along with a bug screen to keep out unwanted intruders, the ventilation will allow the drying effect of air moving through the cavity to occur. This is critical to the proper functioning of DELTA®-DRY. It is very important to have open ventilation at the top and the bottom of the wall. Is it important to have open ventilation at the top and the bottom of the wall? Both of these natural forces will cause air exchanges within the wall cavity. Warm moist air will rise and exit through the top ventilation while cooler drier air will move in through the bottom ventilation to replace it. Normal convection currents within the wall cavity will also move air. Differences in air pressure (wind) will move air through the ventilation cavity. Several natural forces will create ventilation in the cavity. The ventilation cavity must be open at both the top and the bottom of the wall for any ventilation to occur. With a contact area of less than 9%, air may move freely across the wall in all directions. It allows walls that get wet to dry as quickly as possible to prevent mold, mildew and structural deterioration.ĭELTA®-DRY will resist the inward movement of solar driven moisture.ĭELTA®-DRY has a unique dual sided 3-dimensional drainage profile with channels that guide liquid water that hits it downwards and out of the wall where it will do no harm.ĭELTA®-DRY has a unique dimple structure that creates maximum free area with minimum contact with the wall sheathing. As well, DELTA®-DRY adds drainage behind the wall cladding. It creates a continuous drainage path outside of the sheathing boards to prevent the build up of condensation. DELTA®-DRY is a premium ventilated rainscreen that helps protect the structure of the building by providing moisture control in the walls and allowing for ventilation and drying of the building enclosure.
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