Question about construction of a lean-to greenhouse

kudzu9(Zone 8a - PNW)November 19, 2011

I have a friend who wants to construct an attached, lean-to greenhouse consisting of a wood frame and salvaged, double-pane windows and a sliding glass door. The footprint would probably be about 8' X 10' or 8' X 12'. The backside of the greenhouse would be a south facing wall. This wall is a garage wall clad in wood siding; it is insulated, and the garage is heated. We live in the Pacific NW and the winters are mild: most of the season it only goes below freezing for a few days.

Here is the issue. He wants to attach the structure directly to the existing exterior wall, but I raised a concern with him that he might end up with some kind of moisture problem within the wall. Can anybody advise on whether this is something to worry about? And, if so, what is the best way to deal with this?

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I think I would use something like Tyvek house wrap against that wall from inside the lean-to. It breaths but keeps moisture out.

    Bookmark   November 19, 2011 at 9:02PM
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mksmth zone 6b Tulsa Oklahoma(6b)

I built mine exactly this way. My siding is the hardy plank. Of course without opening the wall I wont know if any moisture gets in but I will suggest that he puts a good bead of caulk around the outside frame and all should be good. Teds ideas of the Tyvek is a good one also.


    Bookmark   November 22, 2011 at 8:40AM
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wertach zone 7-B SC

Would a brick house need Tyvek?

    Bookmark   November 23, 2011 at 7:14AM
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poppa(z5 MA)

For what it's worth.

My first greenhouse was a pit/leanto built onto the side of a garden shed. It was 8x12 and had a door leading into the shed. The moisture from the GH got into the shed and the drywall panels i used to finish the shed ceiling (was a nice shed!) all sagged like 3-4 inches! I might not have had that issue if I used greenboard but i don't know.

The shed was 12x12.

The point being, there is considerable moisture in the GH.

Note: I did use a rubber membrane along the south wall to prevent moisture from getting into the wall framing.

    Bookmark   November 23, 2011 at 9:04AM
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kudzu9(Zone 8a - PNW)

Thanks for the info. Did the shed wall have any kind of tarpaper or other moisture barrier under the siding? Was it very moist inside the greenhouse? And did you heat the greenhouse?

    Bookmark   December 1, 2011 at 2:35PM
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