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Greenhouse Construction Tips

Great greenhouse tips and useful information to keep your greenhouse running efficiently.

  ::Construction Tips
  ::Garden Tips


How To Build With Fiberglass

1. Use any good quality wood for your greenhouse framework. Be sure to treat the pieces with a wood preservative before assembly, even cedar or redwood. Copper or zinc based preservatives are safest.

2. 2 x 4 lumber is adequate for framing, but use heavier lumber in snow zones or where rafter length is more than 8 ft. (Check your local building code.)

3. Space rafters and studs 2 ft. apart and install blocking every 24" to 36" in walls and between rafters.

4. Flat fiberglass is rolled out horizontally on roof, but can be installed either horizontally or vertically on walls. (Corrugated fiberglass should always be installed vertically.)

5. Caulk all fiberglass seams.

6. Secure flat fiberglass with wood lath on rafters and studs (no horizontal lath). Nail fiberglass to blocking with aluminum washer-head nails.

7. Provide for ventilation with an exhaust fan system, or large vents in walls.

Framing Notes for Fans & Shutters

For the greenhouse:

Frame wall openings square and 1/2" larger than fan blade and shutter sizes.

For finished sunroom:

Frame rough openings 3-1/2" larger than fan and shutter size. Line opening with 2x4, offset enough toward outside to project past siding. Install fan or shutter. Finish inside by lining rough opening with 1x3.

Bayliss Solar-Powered Vent Controls

These "top of the line" controls will open and close greenhouse vents automatically without electricity. Bayliss vent openers convert energy from the warmth of the sun into mechanical energy to open vents. The hotter it gets, the wider the vents are opened.

Materials: Bayliss openers are made from the best corrosion resistant materials: brass, stainless steel and satin-anodized aluminum. They are designed to give many years of service, are covered by a 2-year guarantee, and can be repaired should the need arise.

Capacity: The Bayliss can exert a force of 14 lbs. at the point where it is attached to the vent. A threaded adjuster bolt can set the Bayliss to start opening the vent at temperatures between 55 F and 75 F. Maximum opening of 12" is reached at approximately 20 F above the starting temperature.

Openers can be installed in a series on a long vent to replace worn out electric vent motors. The adjuster bolt can equalize the loading
so the lifters work in unison.

Installation: Easy to install with screws: top arm to vent, bottom arm to greenhouse frame. Illustrated directions included. Openers are about 12" long and fit neatly up close to the glass.


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