Keep in mind seasonal changes in sun angle (lower in winter, higher in summer) and changes in tree foliage. In warmer areas, afternoon shade may be welcome. In cooler climates, more is generally better. The site should get at least 6 hours of sun per day. The four main factors you want to consider when locating your greenhouse are: Sunlight #1 – Decide Where to Locate Your Greenhouse Step By Step Greenhouse Foundation Buildingīefore you build, check on applicable local building codes. The 12″ wide cap boards also help to distribute the wind load over a wider area, which is a very helpful thing with you regularly deal with 20-30 mile an hour sustained winds, and helpful even if you have the occasional high wind event. Digging a perfectly straight hole can be a big challenge. In our area, we have glacial till that has dumped a lot of rocks in the soil. The 12 inch width is also more forgiving, in case that in spite of your best efforts to get everything absolutely square, you end up a tiny bit off. Add a couple inches on each side for the support boards, and you're up to around 12 inches across. The concrete tube forms' smallest default size is 8 inches in diameter. This wood may be sitting damp for long periods of time, and if you don't use the right stuff, it's going to rot out.ĭo we really need a 12 inch wide strip to bolt the greenhouse to? Yes. You'll need something pressure treated, or specific wood types. Talk to your local lumber yard or hardware store personnel and they will steer you in the right direction. When you select the wood for your greenhouse foundation, make sure that you chose wood that is recommended for below grade installation. A Note on Greenhouse Foundation Wood Choice and Why We Went With 12″ Wide Cap Boards These are tied together with 20 foot long 2″x10″ boards ( stringers) bolted through each of the concrete tubes and 10 foot long 2″x10″ boards (stringers) bolted into the 20 foot long boards.įill the box frame with dirt to eliminate any space where varmints might want to move in and maintain a more uniform temperature and moisture distribution around the wood.įinally, the box frame is capped off with 2″x 12″ boards and the greenhouse is secured the the 12′ wide boards. There are six 8″ concrete tube footings (one at each corner and one midway down each of the 20 foot sides). I'll explain the concept and then follow up with step by step photos. The greenhouse foundation design resembles a frost protected deck footing. Our greenhouse is a 20'x10′ unit with an aluminum frame and 10mm double wall polycarbonate wall and roof panels. #7 – Attach Your Greenhouse to the Foundation.#6 – Create the Box Frame that Supports your Greenhouse.#2 – Clear and Level the Area and Mark the Location of Your Footings.#1 – Decide Where to Locate Your Greenhouse.Step By Step Greenhouse Foundation Building.A Note on Greenhouse Foundation Wood Choice and Why We Went With 12″ Wide Cap Boards.
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