Weather Resistant Barriers (WRB) Reduce Moisture In The Home.
Weather Resistant Barriers (WRB), a key structure to long lasting siding repairs is a moisture and air resistant envelope created with high-performance building wrap, specialized fasteners, penetration gaskets and flashings, polypropylene seam tape, and butyl flashings.
There are many benefits of WRB’s. Besides protection against water infiltration and better control of air flow WRB’s can improve your home’s energy efficiency and lower your energy costs. They also are essential in prevention of rot, mold, and mildew and help enhance your indoor air quality. In the past homes used tar paper and the newer composite materials truly outperform this dated material and are longer lasting and safer.
A few Portland rain ready Weather Resistant Barrier options are:
DuPont Tyvek Drainwrap
Drainwrap helps provide enhanced drainage behind claddings such as primed wood (all six sides), fiber cement siding, and foam board applied over flat substrates. Vertical grooves on the surface of Tyvek® DrainWrap™ make it a superior moisture barrier, engineered to channel bulk water away from wall systems and drain safely to the outside. Its unique structure helps hold out bulk water, while allowing water vapor to pass through it, promoting drying in the wall system, which can help prevent mold and water damage. This also helps prevent air movement through the walls, contributing to a more energy efficient home.
Benjamin Obdyke Hydro Gap
This product effectively eliminates excess moisture which protects against the damaging effects of mold and rot. Hydro Gap sheds bulk water away from the structure, up to 100x more than standard house wraps on the market.
HardieWrap® Weather Barrier
HardieWrap is a high performance weather barrier made by James Hardie, the top producer of siding in the United States. HardieWrap weather barrier offers a balance of water resistance and breathability. This allows moisture from inside your home to escape which, in turn, keeps the area within the wall dry.
Moisture and water infiltration is a significant problem in the Pacific Northwest, especially in Portland. As a result Oregon has adopted a new code to help eliminate moisture infiltration. A weather resistant barrier (WRB) is your home’s best defense against the elements.
How a Siding Rain Screen protects from the Portland Weather.
New Oregon Siding Repair Code
Below is a link to the new Oregon siding repair code that was adopted on January 1st 2010. The new code requires that there is at least 1/8″ gap between the siding and the weather resistant barrier (rain-screen). It’s important to consider Oregon’s new siding regulation when completing a siding or dry rot repair project.
There are a few exceptions to this rule.
The space is not required where:
- Window sills are equipped with pan flashing.
- An enhanced drainage system is installed that meets 75% drainage efficiency.
- It is matching the existing exterior finish as in additions, alterations, or repairs.
These details are crucial to siding repair and replacement. See here for a full description of the code.
Be sure that your siding contractor understands the Oregon siding repair code and does the job right the first time! Though you may want to familiarize yourself with this document, it is not your job to know these specifications, it is ultimately the responsibility of the contractor you hire to work on your home. At SFW Construction LLC, we make sure to research all the latest building codes and keep our practice up to spec while passing along superior customer service and quality craftsmanship to you – our valued customer.
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Work Was Excellent
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Finished Product Was Great
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"...the work was excellent and I would recommend them to anyone needing dry rot repair completed on their home."
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Result Was Flawless
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