I am often asked why we use acrylic for our greenhouses. With all the poly-carbonate models available today I find this to be a very valid question. Poly-carbonate has become cheaper and more readily available over the years, and I envy the ease of buying the material in sheets and simply cutting it to fit. However, I must only reflect on the ingenuity of our patented Therma-Truss design to remember that this is one attribute that truly sets a Sunglo Greenhouse apart from all the rest.
This dual pane design incorporates a smooth outer layer of UV stabilized impact resistant acrylic and a custom corrugated acrylic inner layer . Together they form 1.5 inches of dead air space and result in an impressively high insulation factor of R3.1 which is similar to a dual pane window. To achieve this with poly-carbonate would require such a triple thickness that light transmittal would be greatly diminished to 70%, 60% or even less. A Sunglo has 92% of the light come in. Light is your friend in a greenhouse. In fact, for all its insulating value the radiation transmittal rate is nearly the same as that of glass. Also, the UV stabilized and impact resistance treatment our material receives gives it an expected lifespan of 15 to 25 years without the yellowing so common of poly-carbonate. We guarantee the panels to remain clear for 12 years, even in the Arizona sun. That gives our customers 8 to 15 more years to enjoy owning a Sunglo greenhouse without having to replace the glazing material. And even at that time you may only need to replace the flat roof outer panels. The corrugated inner panels are protected from UV by the outer panels and after a careful wash can still look great. In Seattle we have washed and re-used corrugated inner panels as old as 36 years.
We carry replacement panels for every greenhouse we have ever sold which are easily reinstalled into the durable framework. What all this means is that a Sunglo Greenhouse will create a better growing environment with less energy costs for many, many years.
For these reasons we continue to stand by our acrylic design as we have for over 40 years now, and I applaud the two Boeing engineers who originally conceived and patented the Therma-Truss system. Thanks for reading and please contact us if you have any questions about choosing the proper glazing material for your next greenhouse.