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A stick-framed 12x16 greenhouse glazed in twinwall polycarbonate — real stud walls, real trusses, a storm door. House framing at garden scale.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Side wall plates Top and bottom, both side walls. Treated for bottom plates on ground/concrete. | 4 | 1 1/2" × 3 1/2" × 192" | — | ☐ |
| Side wall studs | 14 | 1 1/2" × 3 1/2" × 65 1/2" | — | ☐ |
| Side wall end posts | 4 | 3 1/2" × 3 1/2" × 65 1/2" | 4x4 | ☐ |
| Knee-wall sheathing Rip more strips as needed for the front and back walls. | 4 | 1/2" × 24" × 96" | Plywood | ☐ |
| Front/back bottom plates | 2 | 1 1/2" × 3 1/2" × 137" | — | ☐ |
| Front/back top plates | 2 | 1 1/2" × 3 1/2" × 87 1/4" | — | ☐ |
| Front/back studs | 8 | 1 1/2" × 3 1/2" × 79" | — | ☐ |
| Truss top chords Both ends 30° off square, parallel, long point to short point. Bottom foot cut comes later, in the steps. | 4 | 1 1/2" × 5 1/2" × 83 1/8" | — | ☐ |
| Truss bottom chords Both ends 60° off square, NOT parallel, long point to long point. | 2 | 1 1/2" × 3 1/2" × 87 1/4" | — | ☐ |
| Truss king posts Long-point measurement, top cut to a 30° point — see the plan diagram before cutting. | 2 | 1 1/2" × 3 1/2" × 21 3/4" | — | ☐ |
| Ridge | 1 | 1 1/2" × 5 1/2" × 189" | 2x6 | ☐ |
| Eaves | 2 | 1 1/2" × 3 1/2" × 189" | — | ☐ |
| Rafters Both ends 30° off square, parallel, long point to short point; birdsmouth foot cut in the steps. | 14 | 1 1/2" × 5 1/2" × 80 1/2" | — | ☐ |
| Purlins | 8 | 3/4" × 3 1/2" × 192" | 1x4 | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 2x4, 16 ft Side wall plates — do not cut, the full length is the point. Treated where in contact with ground or concrete. | 6 each | ☐ |
| 2x4, 12 ft Front and back bottom plates. Treated if on ground/concrete. | 2 each | ☐ |
| 2x6, 16 ft The ridge. Full length, no splice. | 1 each | ☐ |
| 2x4, 8 ft Studs and blocking. Expect to buy a few more for blocking once the glazing layout is real. | 30 each | ☐ |
| 2x6, 8 ft Rafters and truss chords. | 18 each | ☐ |
| 4x4 post, 12 ft Side wall end posts. | 2 each | ☐ |
| 1x4, 16 ft Roof purlins — the polycarbonate screws to these. 8-footers work but add joints. | 8 each | ☐ |
| Plywood, 1/2" exterior, 4x8 sheet Knee-wall sheathing, ripped into 24" strips — it holds the walls square. | 4 each | ☐ |
| Twinwall polycarbonate, 4x8 sheet The single biggest line item, and worth pricing before committing — sheet prices vary a lot by thickness and supplier. | 18 each | ☐ |
| H-channel, 8 ft Joins polycarbonate sheets edge to edge. | 11 each | ☐ |
| Polycarbonate end-sealing strips Per the sheet manufacturer — open flutes grow algae and condensation. | 12 each | ☐ |
| Metal corner trim, 10 ft | 6 each | ☐ |
| Ridge cap for 30° roof, 10 ft |
| 2 each |
| ☐ |
| Rain gutters with downspouts Catch the roof runoff — a rain barrel here waters the greenhouse. | 32 linear ft | ☐ |
| Storm door, 36" x 80-1/2" finished opening | 1 each | ☐ |
| Framing nails, 16D and 8D, or exterior structural screws 3" #10 and 1-3/4" #8 if going all-screw. | 3 box | ☐ |
| Exterior pocket hole screws, 2-1/2" Truss assembly. | 20 each | ☐ |
| Polycarbonate fasteners Per the glazing manufacturer — the source build used roofing screws with sealing washers. | 2 box | ☐ |
Overall cost: $$$$$. Lumber varies by region, species, and season, so we give a band rather than a figure.