8mm twinwall polycarbonate is the most economical glazing materials. It is a practical for a growing greenhouse as it offers 50% more insulation than single pane glass and diffuses harmful sunlight in the summer. It is essentially unbreakable, making it very safe in a family environment. The insulation will prevent the temperature in the greenhouse from changing drastically and results in the best possible growing environment.
R value = 1.89
Approximately 80% light transmission.
16mm fivewall polycarbonate offers unbeatable insulation which is 50% more insulating than double pane glass, or 80% more efficient than 6mm or 8mm twinwall polycarbonate. Fivewall is ideal for colder climates, gardeners who grow specialty plants, or for those who prefer the most energy efficient greenhouse to reduce heating costs.
R value = 3.03.
Approximately 62% light transmission
Windy Weather Package: $490
1. Do you live on a hilltop or ridge exposed to the prevailing wind?
2. Are there winds gusting to over 60 MPH in your location?
3. Do you live in a very windy area?
If you can answer “Yes” to any of these questions, then we highly recommend the Windy Weather Package for your 15 ft. Growing Dome greenhouse kit. This package for our small greenhouse adds sturdy Basilisks Hydraulicheck openers to all of the vents to prevent the openers and vents from being thrashed by strong winds. It also includes an upgraded Aluminum Shade Cloth that is designed to go on the interior of the Dome.
Desert Heat Package: $550
1. Do you live in a desert or semi-desert climate (i.e. hot climate with low humidity)?
2. Do temperatures get above 95° F on a regular basis?
If you can answer “Yes” to any of these questions, then we highly recommend Desert Heat Package for your Growing Dome. This package for our small solar greenhouse kits adds a Solar Powered Cooling Fan for extra ventilation and cooling and utilizes the evaporative cooling effects of a full-surround Misting System that easily connects to your garden hose.
Solar Powered Waterfall: $290 The solar powered waterfall for the 15 ft. greenhouse kit provides aeration for the pond which the fish enjoy and helps to slow down algae formation. Even better, it creates a wonderful ambiance inside our year round greenhouses. View Growing Spaces video of our pond with a solar powered waterfall. Free flowing water, powered by the free energy from the sun.
Metal Glazing Strips Upgrade: $900 Rather than using the clear aircraft tape that comes standard with the Dome Greenhouse Kit to seal the seams between the polycarbonate glazing panels, the Metal Glazing Strips Upgrade includes a strong roofing tape covered by custom built aluminum strips to seal the seams of the green house. After 10+ years of use on our small greenhouses we have found this upgrade provides a longer lasting, lower maintenance option for sealing.
Drip Edge Flashing : $130 This Drip Edge Flashing protects the wood on the inside of the top of your foundation wall from moisture and long-term degradation. There can, at times, be enough condensation accumulate to have water or ice sitting on the top plate of the greenhouse foundation wall for prolonged periods of time. Over the years this can degrade your wood despite having the best wood treatment possible initially applied to the wood. This custom cut and bent metal flashing installs right over your top plate.
Redwood Bottom Plate: $150
The strut on the foundation wall that lays flat against the ground is termed a "bottom plate". The Dome Greenhouse Kit comes with a treated Pro-Wood bottom plate. Pro-Wood is a safer alternative to traditional pressure treated lumber, but some gardeners prefer to go with no treatment at all. For this reason we offer an upgrade to an untreated Redwood Bottom Plate that is resistant to decay for many years.