By Paul Bianchina
Q: What is the optimal way to replace old windows? My house has outdated aluminum windows that I want to replace with new vinyl ones. Some installers want to remove the nailing fins from the new windows and install them by attaching through the sides of the windows into the studs. That way they won't disturb my vinyl siding. Others want to cut back siding and install the new window with flashing. Is this overkill? --Mark E.A: As far as optimal is concerned, the preferred method for installing a vinyl window is to flash the opening and then install the window with the fins over the flashing. This is done to help create a seal around the window so that any moisture - wind-driven rain, for example - that might penetrate through the joint between the window and the siding will not get all the way into the house.
That being said, retrofit windows are certainly an acceptable alternative. Properly fit and installed, and properly caulked and sealed into place, they should form a weather-tight seal that will be safe and effective. Unfortunately, with the ridiculous proliferation of construction-related lawsuits that builders and consumers alike are having to pay for, some contractors have begun to shy away from retrofits because of the potential liability.
If the cost difference between the finned window (including all the work on the siding and trim) and the retrofit window is not too great, I would suggest going with the finned window. However, if it's a substantial jump in price or there is a risk of damage to the siding, you should be fine with the retrofit alternative.
If you do go with retrofits, I would ask the contractor for a couple of references, and go check out one or two of their installations for yourself. Make sure you like the way the windows fit and operate, and like the appearance of the installation. After the windows are installed, you'll need to check them once a year to make sure the caulking between the window and the siding is in good condition, and recaulk the joints as needed.
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