Volume 50, Issue 12 - December 2015
Tales From The Jobsite
Nothing Stays the Same
by Craig Carson
One of the reasons that I look forward to coming to work is that each day is different from the one before. This is true for all of the months and years I’ve been working—this is how our industry changes and how we respond to new ideas.
Glazing installation means and methods have changed a lot over the pastA Better Way
Well, that has changed with the evolution of weatherproofing. It has become a larger and more important factor in energy-efficient construction. We now see frames and glazing installed before the veneers. We also see the glazing systems tied into the weather barrier systems. On many projects, we now provide secondary flexible flashing glazed into the perimeter pocket and apply it over either the liquid allied membrane or some type of paper air barrier (such as Tyvek).
When using a storefront or window in a punched opening, flexible flashing is applied to the frame’s perimeter and to the barrier and insulation is installed to also protect the thermal break. This allows for a superior primary seal for framing the building’s air and water barrier.
This is a significant change from the way we installed systems as few as 10 or 15 years ago. Of course, it also helps the GC close the building earlier, allowing him to start on the interior. It does mean, though, that we need to be more diligent in the placement of the windows if there are panel joints or masonry courses that have to match up to the exterior elevation grid.
There are also added cost issues for this application. In addition to the material and labor cost of the flexible flashing installation, you still need to make one more pass over the skin to caulk between the windows and the adjacent veneer. There are no free rides. To provide a better-designed structure, you are going to add value to the building, and the owner will receive a better product.
An Eye Ahead
New ideas and concepts are always being proposed and implemented. We need to study them and even challenge them to make sure that we understand what they represent and how they will impact our projects. All these new solutions also impact our costs. We need to be sure to understand how they affect us and account for them. Remember, the devil is in the details!
Craig Carson is the regional preconstruction manager for Alliance Glazing Technologies Inc. in Littleton, Colo.