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How do you put spray foam insulation into a hollow core door?

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Answer

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Wiki User
11/14/2014

You can't unless you build your own. Commercially available hollow core doors are manufactured with a cardboard "honeycomb" inside that makes the door stiff and keeps it from warping.

This is correct don't mess with the door. If it's drafts you want to cure fit excludes. If it's noise then confront your neighbors.