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Finishing a Sunroom Ceiling

KelliSean | Posted in General Questions on

We have a sunroom that was originally a covered porch.  The previous owners had it enclosed.  It has air supply and return and two walls of windows.  The ceiling was left as the Original porch vinyl.  I want it finished like an indoor room.  I removed the vinyl so now the ceiling is chipboard sheathing.

I would like tongue and groove or drywall.  Should the sheathing be left in place?  What are the steps to finish this correctly.  I’m in St. Louis which I think is zone 5.
Thank you


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  1. Expert Member
    Akos | | #1

    If you can vent the attic space above the porch, the simplest is a standard vented assembly with batts between the ceiling joists. You can also blow insulation in there if you don't want to take the OSB down by drilling a couple of holes for access.

    If the OSB under the existing joists can be left in place with the seams taped with a quality sheathing tape (Zip or 3m 8067) for air sealing, than the T&G can be installed right over it.

    1. KelliSean | | #2

      Thank you for the advice I didn’t think about the zip tape. There is some blown insulation and the roof is vented at the ridge and soffit.

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