How to Keep Mildew off Your Porch

Here’s a question from our 6/1/2019 Today’s Homeowner Radio Show.

Joel from Maine says, “I have a wraparound farmers porch. The overhead of the porch is white and has substantial black mildew on it.

I wash it each spring with soap and water, but it always comes back. I want to paint it — what steps do I need to follow, to kill the mildew and coat with a mildew-resistant (if such a thing exists) paint?”

We tell Joel to clean the surface really well using either Zinsser Jomax or TSP. Then add 3 coats of paint to the wood.

To add extra protection Joel can mix in M-1 to the primer before the overhead is painted.

Listen above for the segment!

Read the blog from the June 1 show and listen to the full broadcast here


  1. Zinsser “Mold Killing” primer paint – interior/exterior! Kills existing mold, mildew and bacteria. Check it out!


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