Since my readership has double after posting about building my greenhouse, I’m adding a follow-up post about the finishing touches. The original post about designing and building the greenhouse is here: First Post
At first I used duct tape where I needed to tape things. Duct tape doesn’t stand up to weather, but it’s cheap and readily available. In a comment I received, I learned that polyethylene tape is available online, and is made for such uses as greenhouses. It’s also pretty expensive online. I stopped at Ace Hardware in Los Gatos last week, and they had poly tape for $8. a roll. My daughter helped me replace all the exterior tape, by putting her hand on the inside of the wall so I had something to press against. The total cost for the greenhouse, by the way, was just about $200. That includes about $30 for shipping. If you can figure out everything you need shipped in one order you can probably cut that part of the cost by half.
The poly walls flap a bit with any amount of wind, and flap quite a lot when it’s gusty. They aren’t loose enough to put clamps on the posts along the walls. I’m not sure if it would be better to have clamped it at each post when I installed it, or had someone help me make it tighter. The diagrams I found online only showed clamps on the corner posts. I have plenty of clamps left, so in a few years when this poly needs replacing, I may try making it loose enough to put clamps on every post.
I wrote that I intended to make a velcro closure for the door, and it’s working very well. So here’s how I made it. I had some leftover strapping from making a handle for a tote bag, and cut two strips of it a foot long long. I bought some sticky-back velcro. Onto each piece of strapping I stuck 6 1/2 inches of the fuzzy side to one end of the strapping pieces. Then I stuck the same length of the prickly side of the velcro to the other end, other side of each strapping piece.
I cut a slit in the poly by the door frame post, and one at the same height on the door post. As usual, I lined the cut piece of plastic with duct tape so the poly wouldn’t tear. Then I pushed the velcro through the hole and around the posts so that the fuzzy side was on the outside around each post until the prickly part connected with it, and the rest of the prickly part stuck straight out from the frame post, and straight in from the door post. That way, I can hold the door shut whether I am inside or outside.
I also have a brick just outside the door. My daughter moved some soil around and placed a couple pieces of scrap wood outside the front of the greenhouse to make it level with the edge of the raised garden bed where I built the greenhouse. That’s a big improvement over stepping over the wooden frame.
I put in a thermometer. On warm days (70s), it gets over 100 degrees, so I leave the door ajar during the hottest part of the afternoon. On cool days (high 50s to low 60s) it gets into the 80s inside. I can’t wait to try growing some basil and a tomato plant or two in there!
June update: Everything is working well except the roof poly. Because the roll was folded, the fold lines are weak. I’m making a new roof, covering all the fold lines with poly tape. Only one piece of a fold line has ripped on the wall poly, so I’m going to tape a scrap piece over it. If you can avoid the folded rolls of poly you shouldn’t have this problem. Today, I found that a nursery/farm supply store about 15 miles from me carries poly 10′ wide, and clamps to hold it on the PVC pipe.