GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Exterior insulation – How to install metal flashing around window

bonai | Posted in General Questions on

Hi there,

Like in the attached picture, I am planning to install custom made metal flashing to accommodate 1 1/2″ of exterior foam around already installed windows.

Does the flashing need to be flushed around the window or should a small gap be left?

I am planning to to caulk the corners. Should I also caulk between the window and the flashing?


GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. Expert Member


    Are you using flanged windows?

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |