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Community and Q&A

Paint exterior before rigid foam?

Bbrown3381 | Posted in Energy Efficiency and Durability on

Zone 2…1962 block one story house…bare painted block is interior look. Installing 2″ exterior ridged foam..
The question….since the foam is a vapor barrier do I need to seal the block prior to foam installation.
House has a couple coats of structurally sound paint…but could use a repaint.


  1. wjrobinson | | #1


  2. GBA Editor
    Martin Holladay | | #2

    The last time this topic came up, Dana Dorsett raised an interesting point concerning window flashing. If you aren't able to install new flashing in your window rough openings, you may need a plan to address wind-driven rain.

    Here is a link to the thread I'm talking about: Insulation design.

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