How to Build a High-Tunnel Greenhouse | Ask This Old House

Roger Cook helps a homeowner build a simple, affordable backyard greenhouse. (See the shopping list and tools below.)

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Roger visits Biloxi, Mississippi where he builds a high tunnel greenhouse with a homeowner.

Shopping List for How to Build a High-Tunnel Greenhouse:
- 1-inch-diameter PVC pipe [amzn.to/31pKO4k], to create frame of high tunnel
- 1 1/4-inch-diameter PVC pipe and reducer coupling [amzn.to/2IBbsyn], to make sleeve that fits over galvanized pipe
- Pressure-treated 2x4s [amzn.to/2WynL3s], for building end walls and base
- Pressure-treated 2x2s [amzn.to/2WvmZEf], for framing two doors
- 4-mil clear plastic sheeting [amzn.to/2X5QnFy], to cover the PVC frame
- 3-inch screws [amzn.to/2WvnX3l], for attaching 2x4s
- Galvanized pipe [amzn.to/2F4we8N], to secure the PVC pipe to the ground
- PVC primer and cement [amzn.to/2X6MeBh], for gluing together PVC pipe and fittings
- Metal pipe brackets [amzn.to/2WZqLKD] with 1 1/4-inch screws and washers [amzn.to/2Wz567y], used to secure PVC pipe to 2x4 base
- Six 3-inch butt hinges [amzn.to/31rKemj], for hanging two doors
- 1/4-inch staples [amzn.to/2WZrDyT], to secure the plastic sheeting

Tools List for How to Build a High-Tunnel Greenhouse:
- Cordless drill [amzn.to/2KaQUQt], to drill holes
- Impact driver [amzn.to/31tcEwj], for driving screws
- Circular saw [amzn.to/2Ka2paZ], to cut 2x4s
- Auger [amzn.to/2KduJt5], to drill holes in soil
- Small sledgehammer [amzn.to/2XE1x1t], for pounding in galvanized pipe
- PVC saw [amzn.to/2Kd59V4], to cut plastic pipe
- Staple gun [amzn.to/2wLBYzt], for attaching the plastic sheeting
- Utility knife [amzn.to/31tkuX4], to cut plastic sheeting

All of the materials for this project, including 20-foot lengths of 1" PVC pipe, Pressure-treated 2x4s, and 4 mil plastic sheeting, are available at home centers.

Expert assistance with this project was provided by the Mississippi State University Coastal Research & Extension Center [coastal.msstate.edu/].

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How to Build a High-Tunnel Greenhouse | Ask This Old House
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