Good windows still need good installation. Check the flashing, shimming and sealing details before the first unit goes into the wall.
You can put the best made, highest rated window in a new home, and still feel a cold draft next to the frame. But if that happens, chances are it’s your fault, not the window maker’s. You didn’t follow the exacting, precise instructions they provide, free of charge.
It used to be that window installation tips were often simplistic—or considered the builder’s responsibility. But companies such as Pella, Kolbe & Kolbe and Marvin have poured a lot of research, experience and money into educating the end users of their products. The Internet, of course, has made that process much easier. But the building science of installation has improved alongside new flashing systems, expanding foam sealants and clad and composite window frames.
Flashing, fastening and air sealing work together. This montage from the original article illustrates the details; use the current guide for your window and wall assembly.
If you’re still hanging windows the way you always have, you may want to take a few minutes and bring yourself up to speed. Take a look at the following sites, and you’re likely to learn something that will save you labor, prevent a callback, or improve energy efficiency. They also include tips to increase the product’s durability.
The sample instructions below were quoted in the original 2012 article. They illustrate why the details matter, but are not a substitute for today’s complete, product-specific instructions. Match the guide to the window, wall assembly and local requirements.
Sample Instruction: “If a flexible adhesive membrane is not used to pan the sill, be sure to properly seal the bottom corners of the rough opening.”
The original article referred to Marvin’s Integrity line. For current products, use Marvin’s collection-specific instructions; its current collections include Elevate and Essential. The Elevate new-construction guide covers new wood-frame construction and directs installers using other wall or replacement conditions to the appropriate details.
Veteran journalist Matt Power has reported on innovation and sustainability in housing for nearly three decades. An award-winning writer, editor, and filmmaker, he has a long history of asking hard questions and adding depth and context as he unfolds complex issues.
Windows: Installing Them Right
Good windows still need good installation. Check the flashing, shimming and sealing details before the first unit goes into the wall.
You can put the best made, highest rated window in a new home, and still feel a cold draft next to the frame. But if that happens, chances are it’s your fault, not the window maker’s. You didn’t follow the exacting, precise instructions they provide, free of charge.
It used to be that window installation tips were often simplistic—or considered the builder’s responsibility. But companies such as Pella, Kolbe & Kolbe and Marvin have poured a lot of research, experience and money into educating the end users of their products. The Internet, of course, has made that process much easier. But the building science of installation has improved alongside new flashing systems, expanding foam sealants and clad and composite window frames.
Flashing, fastening and air sealing work together. This montage from the original article illustrates the details; use the current guide for your window and wall assembly.
If you’re still hanging windows the way you always have, you may want to take a few minutes and bring yourself up to speed. Take a look at the following sites, and you’re likely to learn something that will save you labor, prevent a callback, or improve energy efficiency. They also include tips to increase the product’s durability.
The sample instructions below were quoted in the original 2012 article. They illustrate why the details matter, but are not a substitute for today’s complete, product-specific instructions. Match the guide to the window, wall assembly and local requirements.
PELLA
Sample Instruction: “Wood/Plastic Composite shims work very well, they are easier to use and will not absorb water, unlike some wood shims.”
Marvin
Sample Instruction: “If a flexible adhesive membrane is not used to pan the sill, be sure to properly seal the bottom corners of the rough opening.”
The original article referred to Marvin’s Integrity line. For current products, use Marvin’s collection-specific instructions; its current collections include Elevate and Essential. The Elevate new-construction guide covers new wood-frame construction and directs installers using other wall or replacement conditions to the appropriate details.
Kolbe & Kolbe
Sample Instruction: “Primed wood and metal must remain dry and finishing should be completed immediately.”
Updated content: October 20, 2026.
By Matt Power, Editor-In-Chief
Veteran journalist Matt Power has reported on innovation and sustainability in housing for nearly three decades. An award-winning writer, editor, and filmmaker, he has a long history of asking hard questions and adding depth and context as he unfolds complex issues.Also Read