Replacement Window Guide

The most under-appreciated drivers of comfort, energy efficiency, and longevity when replacing windows, is the installation method and expertise of the installer.

Notwithstanding the horror stories that are all too easy to find, we as homeowners tend to focus on what replacement window to buy but take for granted that the windows will be installed the right way. Or we close the sales with the in-home sales person and never see the installation crew until the old windows are being removed.  Immediately after the installation, a poor job could be “invisible”.

In short order, the caulk used for your replacement windows will open gaps and allow moisture to attack the foam and other materials used to “seal” the window. Depending on the installation, moisture can infiltrate the wall and cause significant damage to the framing and drywall that will be discovered only after the damage is done and expensive to repair.

Protecting yourself is not hard. The most widely known and trusted certification for window installers is the Installation Masters Institute founded by the American Architectural Manufacturers Association. The course takes one and one-half days and cost just $350-400. Once certified, the installer is given a card to prove their competency. Given the low cost and minimal time commitment, we strongly recommend you demand to see this certification and accept nothing less when choosing an installer for your replacement windows.

Part of the Installation Masters certification specifies the use of nailing fins on the replacement window whenever possible. The nailing fin allows the window to be well attached to the home and more importantly provided a surface for protective flashing to be applied to the window, directing moisture away from the interior. There are replacement windows that are manufactured without nailing fins. It takes significantly more time to attach a window and properly seal it (the Installation Masters approach) than to slide one into the opening, screw it in place, and use foam and caulk as the only lines of air and water defense. Since time is money, fast beats quality, particularly if homeowners are not aware of the inherent compromise.

Seek Certification
Many major window manufacturers train and certify installers on their lines. Using the same contractor for purchase and installation can avoid finger-pointing if there is a problem later. Also look for certification from the American Window & Door Institute (www.awdi.com) or InstallationMasters (www.installationmastersusa.com).

Expertise is harder to nail down. Checking references is a must and relying on the aforementioned AAMA certification will help. Beyond that, ask if the installation crew has a current job underway. If so take the time to visit the job and talk to the owner. Trust your eyes. Is the work neat and organized? Are the home’s furnishings well protected? Would you feel comfortable with the installers in your home? Lastly ask for proof of general liability and workman’s compensation insurance. There are smaller, high quality installation companies that do not have workman’s compensation but don’t allow anyone to work on your home who does not have general liability insurance.

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