Masonry Magazine June 2012 Page. 36
FLASHING
Unitized flashings are single-component flashing systems that can be offered with any of the different flashing membranes that have been discussed. Inclusions to the system consist of a membrane, pre-designed laps, screws, weeps, termination bar, drip edge and a mortar collection device that has passed the requirements of the ASTM E-514 water test. Unitized flashing solutions also come with manufacture-supplied, pre-engineered flashing take offs, special-cut panels for window and door heads delivered to the jobsite, and technical supervision and training. This additional service is provided by one flashing system manufacturer for no additional expense to the project. Unitized flashing can carry a premium cost. However, the economic benefits have been proven over the years with no failures reported.
New to the market this spring is the roll flashing that has been made with the mortar collection system attached directly to the membrane. With clean lap spaces available every six inches and weeps built into the roll, the TotalFlash Roll product has taken off like it was shot from a cannon. The membranes offered for the TotalFlash Roll Solution are any of the membranes and composites that were discussed earlier, which allows the design or construction team to choose the correct membrane for the project.
Manufacturer support for the TotalFlash Roll Solution can include a manufacture pre-engineering flashing quantity take-off and personal technical assistance to aid the mason contractor with installation support.
All of the flashing membranes mentioned in this article are compatible with all of the high-loft, non-woven and unilateral mesh products used in mortar-collection devices and mesh-wall fabrics that cover the entire inner wythe of the structure.
It is critical that the wall mesh not be placed behind the termination bar. Placement of the mesh should extend over the termination bar and lap about one inch over the flashing.
The last major improvement observed in the sealant and flashing market is that contractors now can obtain answers to their technically based questions, regarding anything masonry. One of the companies, Mortar Net USA LTD is offering flashing solutions and has created a specialized staff to answer questions posed by the mason contractors regarding all masonry questions. Today's technical departments are free to the design and construction personnel answering anything masonry.
As with any industry, parts of the flashing and sealant industry constantly are changing the rules for the benefit of the design and construction team found on many of the projects that you currently work on. We are trying to help mason and roofing contractors by preventing one leak at a time. IMAS
Steven Fechino is an engineering and construction manager with Mortar Net USA LTD.
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