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Im putting a r panel roof over shingles do i need  1x4s for spacers to keep out moisture

Hi Roger. Good question. I get asked things like this on a regular basis.

Here are a couple of articles I have written before about this subject:

I hope that these provide the answers you're seeking.

Please feel free to contact me anytime.

Todd Miller


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Todd E. Miller


I am available to answer any questions pertaining to residential (or other sloped) metal roofing. I have knowledge of most available products but I like to approach projects from a "needs" basis and analyze them individually. Additionally, I can answer most questions about building ventilation.


I have worked for a manufacturer of residential metal roofing since 1980. I currently serve as President and have been involved with a wide variety of projects of all types across the world.

I am a board member for Metal Construction Association, Metal Roofing Alliance, the local United Way, our church, and our son's school.

Over the years, I have had articles appear in several trade journals including RSI, Remodeling, and Qualified Remodeler.

I have a B.A. in Communications and have also completed three years of training with the E-Myth Academy.

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