How best to air/water seal a retro-fitted window for EIFS installation?

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Posted by: from Ottawa
7/13/2020 at 6:06:23 PM

Background. New windows have been installed that are only about 1 inch proud of the OSB siding, and foamed into place. They have no flanges. I need to properly seal them for a new EIFS installation, which is 2 inches thick, and with at least 2 water barriers. The issue is complicated by an existing EIFS installation which needs to be removed as it did not meet code. The current EIFS contractor does not want to deal with this so it's up to me to find a way forward. See the attached file for what I propose. What is not mentioned is that a bead of silicon caulking would be put in between the window and the flashing. Will this theoretically to the job?

How best to air/water seal a retro-fitted window for EIFS installation?
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Date/Time7/14/2020 at 2:24:38 AM

It sounds like you're thinking to enter round #2 of being non Code-compliant. Assuming this is a Part 9 building (i.e. a house), the Building Code goes into great detail with respect to referencing window installation standards (CSA A440.4), EIFS standards (CCMC Evaluation Reports), sealant standards, etc.

If you're planning to not fully comply with the Code & referenced standards obviously you will be at risk & in a few years will be contemplating round 3.

Additional sources of information (aside from contractors) are the suppliers & related online info (CCMC Evaluation Reports can also be viewed for free).

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