• Inventors of the patented Rain Jacket Flashing System

Rain Jacket Flashing System




Did you know that most window installations are not done properly? According to the director of the American Architectural Manufacturers Association (AAMA), nearly 8 out of 10 replacement windows are installed incorrectly! Common problems include the use of low-grade sealant without nail fins and a lack of integration into the existing building paper—leaving windows vulnerable to water damage, air penetration, mold, and rot.



Instead of taking a gamble on the installation skill of local window companies, turn to the proven experts at 2FL Windows & Siding! We’ve eliminated the common problems of shoddy window installations by inventing and patenting our own method, the Rain Jacket Flashing System. By using this revolutionary installation system, we guarantee windows that live up to our motto: Integrated-Leakless-Flawless!


Shield Your Seattle and Tacoma Replacement Windows With a Protective Rain Jacket



During our more than 25 years of industry experience, we’ve seen nearly every kind of window installation method: glue and screw, nail on, cut out, and stucco fin. Though these methods are quick, easy, and popular, they often result in serious long-term problems, including:


  • Compromised weather barriers from torn or broken building paper
  • Vulnerable spots in exterior caulking, which may crack or peel
  • Smaller windows (due to the need to fit into the existing frame)
  • New entry points for water along exterior fins


To prevent these costly issues, we invented the Rain Jacket Flashing System, an installation method that utilizes multiple layers of flashings, back pans, and high-grade membranes. This system takes more time and requires more specialized components, but it provides three separate barriers against air and water infiltration. Because our innovative system integrates to your existing building paper, a true weathertight seal is created—one that passes AAMA pressure tests and can withstand 120 mph winds.


This system is so effective that we’ve never once had to make a service call, even with thousands of Seattle and Tacoma replacement windows installed!


Learn More About Our Revolutionary Window Installation Method Today


Your Washington replacement windows are only as good as their installation, and nothing beats the weather resistance and durability of 2FL’s patented Rain Jacket Flashing System. To see how our system can reduce the risk of mold and rot in your home, give us a call today! If you’re ready to start with a free consultation and estimate, fill out our quick online form to get started.


  • “A great experience … spending money (for me) usually isn’t ….”

    S Diane
  • “We have spent hours just walking through our home saying, ‘Wow!! Unbelievable!!’… it truly is gorgeous!”

    R Wright

We service the I-5 corridor, included but not limited Seattle WA, Tacoma WA, Bellevue WA, Everett WA, Federal Way WA, Kent WA, Renton WA, Auburn WA, Lakewood WA, Shoreline WA, Redmond WA, Kirkland WA, Olympia WA, Edmonds WA, Sammamish WA, Lacey WA, Puyallup WA, Marysville WA, Bremerton WA, Lynnwood WA, Bothell WA, Burien WA, University Place WA, Mount Vernon WA, Des Moines WA, Issaquah WA, SeaTac WA, Bainbridge Island WA, Mercer Island WA, Mountlake Terrace WA, Maple Valley WA, Kenmore WA, Mukilteo WA, Mill Creek WA, Tukwila WA, Covington WA, Arlington WA, Monroe WA, Tumwater WA, Bonney Lake WA, Centralia WA, Lake Stevens WA, Lake Forest Park WA, Enumclaw WA, Woodinville WA, Newcastle WA, Snoqualmie WA, Edgewood WA, Snohomish WA, Sumner WA, Shelton WA, Burlington WA, Poulsbo WA, Port Orchard WA, DuPont WA, Fife WA, Chehalis WA, Gig Harbor WA, Milton WA, Brier WA, Normandy Park WA, Fircrest WA, Pacific WA, Orting WA, Duvall WA, Yelm WA, Stanwood WA, North Bend WA, Buckley WA, Black Diamond WA, Granite Falls WA, Medina WA, Clyde Hill WA, Algona WA, Everson WA, Gold Bar WA, Carnation WA, Tenino WA, Roy WA.

  1. R Wright