Well I finally got off my ass and put a new covering on my greenhouse. I really like to raise all my own vegie plants for my yearly garden. This summers heat melted the roof of my greenhouse. We had plenty of days as hot as 109 deg. It does'nt take much of that to screw things up. My greenhouse is a A-frame design. I put solid ends and 6 mil. plastic covering over the roof. I stripped the plastic with 1/4 x 1 1/2 wood I cut from a 2 x 10 board. I use three 250 watt heat lamps to keep it warm in the winter months. It measures 10 ft. x 8 ft X 10 ft. tall. It raises all the plants I need in my garden and have plenty to give all my neabors.