12x18 passive solar greenhouse kits

12’×18′ DIY Greenhouse Kit

  • Included: Custom cold weather exhaust fan, circulation fans, 20 sheets of precut 8mm polycarbonate twin wall, aluminum base and cap trim, aluminum U channel trim, poly U channel trim, thermostat for exhaust fan, hinge s for roof vents, sidewall vent and window, closing mechanism for window, 4 Gigavent openers, door knob, Montana Canvas shade fabric, screws for lumber and twin wall, 4 custom powder coated greenhouse anchors, 1” metal strapping for X-bracing, printed and 84 page assembly instructions and material list with a digital copy, unlimited phone/email support
  • Price: $7,900*
  • Sold Separately: lumber (approximately  $2400) or galvanized steel (approximately $2900), corrugated metal siding and trim $1,000), door $400, 1.5” rigid foam insulation with reflective foil ($210)
  • Tools Needed for Assembly: Cordless Drill, Circular Saw, Hammer, Measuring Tape, Framing Square, Torx #25, #30, and #40, 5/8″ and 1/4″ drivers, 4” grinder, stapler and utility knife
  • The labor hours to build this structure will take 1 person 120-160 hours. This is assuming that person has some basic skills in carpentry

*50% deposit required. Everything included in the kit is delivered following the 50% deposit except the polycarbonate twin wall. Upon receipt of 2nd payment twinwall ships from Amerilux in Wisconsin inside a large wooden crate 6’ wide and 15’ long.

*Shipping costs not included (approx. $1,600)

If you would like to purchase an Alpine product please contact us via EMAIL or TEXT. We will be happy to send you an invoice through QUICKBOOKS which you can easily pay online. Quickbooks’s accepts credit cards, debit cards, Apple Pay, PayPal, Venmo or ACH bank payments.

Features Summary

  • Custom truss and top plate design is stronger than hurricane ties
  • Designed to withstand 100+ mph wind (industry standard is 60mph) and 100 lbs per square foot of snow.
  • Architectural design helps wind push the structure into the ground instead of knocking it down.
  • Gigavent automatic vent openers are rated for 60+ mph wind
  • All framing is constructed with screws instead of nails.
  • Constructed with 8mm twinwall polycarbonate (industry standard is 4.5mm).
  • Fasteners with metal/rubber washer on 12″ centers.
  • Metal trim on corners and ridge also utilizes screws with metal/rubber washer on 12″ centers. This seals all exposed corners from weather; the same system is used on modern houses/barns.
  • Every seam, interior and exterior, is caulked with waterproof sealant.
  • Cold weather exhaust fans stop entry of air/cold/heat into structure. The industry standard fans do not.
  • Cold weather exhaust fans are considerably quieter than the industry standard fans.
  • All wet areas and foundation are constructed with Alaskan cedar to resist decay for an average 50 years.
  • Custom designed anchors connect to concrete piers or 5′ rebar driven into the ground at opposing angles.

Features Summary

  • Custom truss and top plate design is stronger than hurricane ties
  • Designed to withstand 100+ mph wind (industry standard is 60mph) and 100 lbs per square foot of snow.
  • Architectural design helps wind push the structure into the ground instead of knocking it down.
  • Gigavent automatic vent openers are rated for 60+ mph wind
  • All framing is constructed with screws instead of nails.
  • Constructed with 8mm twinwall polycarbonate (industry standard is 4.5mm).
  • Fasteners with metal/rubber washer on 12″ centers.
  • Metal trim on corners and ridge also utilizes screws with metal/rubber washer on 12″ centers. This seals all exposed corners from weather; the same system is used on modern houses/barns.
  • Every seam, interior and exterior, is caulked with waterproof sealant.
  • Cold weather exhaust fans stop entry of air/cold/heat into structure. The industry standard fans do not.
  • Cold weather exhaust fans are considerably quieter than the industry standard fans.
  • All wet areas and foundation are constructed with Alaskan cedar to resist decay for an average 50 years.
  • Custom designed anchors connect to concrete piers or 5′ rebar driven into the ground at opposing angles.

What To Expect When THE Project Begins