About Greenhouse Construction

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With insulated end walls and roof deck, a foundation wall with foam board against it, and the house foundation and wall for backing, you have a pretty well-built house addition that can hold heat. Now let’s build the solar gain part of the greenhouse. Screw the rafters into place, resting the lower ends on top of the window wall plate covered by 90# roll roofing and attaching the other ends to the face of the roof deck, as shown in the drawing.


Sight across the rafters as they are put into place, making sure they are even with one another, which they should be if you were careful and accurate during construction. Over-enthusiasm. A good deal on tempered glass led to this four story greenhouse that was so big it included an area for drying firewood, a tea party room, and two guest rooms besides a place to grow plants.


Our greenhouse has fifteen of them. Before setting them in place, take care of the following details: Attach a layer of ice and water shield to the top surface of your rafters. It comes in rolls of various widths. Use the 4-inch-wide stuff. That will give a half-inch overhang on each side for extra protection.

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You have built an insulated foundation wall with a window wall on top, roof deck, end walls, installed the rafters, and have a waterproof, soft surface ready for your tempered glass panes to rest on. Here is how they should fit. Each pane of tempered glass should sit on the rafters one inch in from the edges and one inch onto the upper support piece.


I used a screw gun and did the final tightening with a hand screwdriver. Okay, the glass is installed and now it is time to cover the roof deck (Greenhouse construction). I used 90# rolled roofing and still would today, but underneath it I would use a wide layer of ice and water shield


Someday you may have to replace a pane of glass and this will make it easier and avoid damage to the roofing material. Do use plastic roofing cement to hold the 90# rolled roofing in place on the roof deck. Avoid using roofing nails. Here’s another tip I learned from experience.

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I had to install a gutter to catch the rainwater and spill it off to the sides. This presents an opportunity to catch thousands of gallons of rainwater and one of these days I will take advantage of that situation. If your installation needs it, put the gutters on sooner rather than later.


Hot sun can do this­—I have seen it. I attached some positive stops at the lower corners of the glass where two panes come together. First I screwed ½-inch thick spacer blocks to the lower window walls out to the edge of the panes. important link Remember, the panes overhang by a half inch.


I protected the glass by putting some tough plastic U-channel around the glass where it met the metal. Now the board clamps hold the glass down and the stops keep the panes from sliding down the wall. And that’s about it. You have your greenhouse up and running. Of course there are other details to consider and here are a few: Our 15 panes of tempered glass did not exactly take up the full length of the greenhouse.

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This was good because any little mismeasurements in the structure can be corrected or compensated for here. Be sure to build it like the roof deck with insulation, roofing, and vapor barrier. The foundation wall of our house was exposed to plenty of sun coming through the glass ceiling. To make it a better heat collector I painted it dark green.


In summer you cannot have too much screened vent area. In winter you don’t want any. We have about 16 square feet of screened vents, including the one with a temperature-controlled fan, plus two screened doors that are each 17 square feet. That ratio (50 square feet of vent per 3000 cubic feet of volume) works well for us.


Any mixing of air between these two parts of your home will bring you much pleasure. I recommend that all your electrical wiring be exposed. In a workspace where nails or screws are going to be driven hither and yon you want to be sure you can see any electrical dangers.

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Provide a way to completely drain the supply plumbing in your greenhouse. There will be times when it gets cold enough to freeze pipes. Somebody will forget to do the draining. I won’t mention names. PVC or CPVC (plastic) plumbing pipes and fittings are much easier to install and repair than copper pipes.


I use a big push broom to pull the snow off the greenhouse glass after a storm. It is surprising how well snow insulates. When the snow comes off you can see the temperature rise very quickly inside the greenhouse on a sunny day. There is one bit of magic we discovered with our greenhouse.


To our surprise we found that the rather moist air in the greenhouse forms frost on the underside of the glass ceiling on cold nights, preventing heat from radiating out. In the morning the sun melts the frost and warms the place all day. Because of this effect we decided not to put a woodstove out there, as we had considered doing, and have not missed it at all.

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It required clearing the space of all plants and a find this thorough delousing of the place. Sounds traumatic. It was, but doable in a controlled area, and your greenhouse should be very well controlled with good doors, solid walls, and tight construction. Be very careful what you allow into your greenhouse.




Pollinating plants is a bit of a problem in a greenhouse where insects can’t do the job for you. One lady we heard about had a beehive built into a side wall of her greenhouse. The bees had access to the greenhouse and the outdoors. Brilliant. And she got some honey.




It is a big job but worth the time and investment. The advantages in food production and heating more than make up for the cost of the addition in very few years - Greenhouse construction. Increased self-sufficiency in these uncertain times is a good reason to consider attaching a greenhouse to your home

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Due to limitations in lens and Im, Spector optics, such a view it hyperspectral image is oversampled and binning can be used to reduce the size of the image without losing information (Polder et al., 2003a). After image preprocessing in which different tomatoes are labeled separately and specular parts in the image are excluded, 200 individual pixels were randomly taken from each tomato.


The error rates for five individual tomatoes are tabulated in Table 12. 1. From this table, it can be seen that the error rate varies from 0. 48 to 0. 56 with a standard deviation of 0. 03 for RGB. Greenhouse construction. For hyperspectral images the error rate varies from 0. 16 to 0