Masonry Magazine August 2016 Page. 20
AIR BARRIERS
Fully adhered air barriers, like DELTA-VENT SA, eliminate many of the potential problems caused by ordinary air barriers.
Leaks: A Big Issue
AIR LEAKING INTO THE WALLS can be a significant prob�lem for buildings. Air penetrates through the cladding or masonry, through penetrations and fasteners, or through window and door openings, wasting energy. This non-con�
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ditioned air makes the insulation less effective. Contractors are the last line ofdefense to ensure that the structure is air�tight. Attention to detail during installation is critical, but using high-performance air barriers makes it easier to end up with an energy-saving, airtight structure.
Reducing Risk
HOUSE WRAPS have been the generally accepted weather enclosure solution for many years. Over time, however, house wraps have gone from being an adequate solution to one that is now viewed as just "good enough" to meet code. Technology has made higher-performance air and water barriers a preferred choice for contractors and builders who aren't satisfied with just meeting building codes.
Typically, building codes take time to catch up to prod�uct improvements. However, forward-thinking builders and contractors are using higher-performing air and water barriers before they are required by building codes. Not only does this keep them up to date with current thought in building science, but it also keeps these builders ahead of their less progressive competitors.
A contractor can be at greater risk because mechanically attached (nailed) house wraps are more prone to installa�tion problems. Frequently, the wrong type offastener is used or seams and penetrations are not completely taped and sealed, allowing air to flow past the air barrier.
House wraps are also prone to being ripped, torn or even blown off due to high winds that hit the structure before the cladding or masonry exterior has been installed to protect the house wrap.
As more homeowners go online to educate themselves, they have access to home energy auditors with tools like thermography and infrared thermometers. What used to be an acceptable level ofair leakage is no longer acceptable.
18 I MASONRY � August 2016 � www.masoncontractors.org The Voice of the Masonry Industry