re: Spray foam insulation

quote:

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To do it right the existing insulation on the ceiling needs to be removed and the entire attic needs to be sealed.

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This is what I have always thought, but I'm interested if any of these guys just added the underroof insulation alone. My attic has to be 130 degrees in the summertime. I'm not super interested in a full insulation removal and sealing, but would consider just adding the roof insulation if it had a decent benefit.