![]() This is because the additional weight of the brick or cinder blocks could otherwise sink into the soil and affect the structural integrity of the greenhouse. For a freestanding greenhouse with a knee wall (a brick or cinder block wall that stands roughly knee high), a 12” x 12” surface footer is required. Rebar can be added to the wooden base for additional support if desired. The best wood choices for a lumber base are usually cedar, redwood, or cypress. In fact, if the greenhouse doesn’t have a knee wall, it can be placed directly on a cement slab or it can be placed on a 4’ x 6” treated lumber base. Freestanding greenhouses can have a concrete slab poured without a deep foundation. ![]() Smaller, freestanding greenhouses do not have the same requirements as an attached greenhouse and, therefore, give the grower more options when it comes to the foundation and floor. Regardless of the floor material chosen, the footing requirements will not change. Some gardeners prefer a gravel floor for its natural drainage properties as well. A limestone screening and weed barrier placed beneath the gravel will ensure no weeds start growing from the floor. However, some gardeners still prefer the moist, earthy smell of gravel and will have a gravel floor installed. In most cases, the gardener is already planning on the expense of a foundation for the attached greenhouse so the cost of pouring a concrete pad for the floor is seen as a minimal addition. If you plan on building an attached greenhouse, you should also plan on a more extensive foundation. As the ground freezes and thaws structures without the proper foundation could move or sag. Basically, attached greenhouses require frost free footers that will not shift or move. Local building codes will determine the exact depth needed for the footers. If you have an attached even-span or a lean-to greenhouse there is a need for footers with the foundation. The choices for a greenhouse’s foundation are typically dependent on the type of greenhouse structure that will be built. Footers help to prevent sagging or the dropping of the structure’s walls and/or floor into the ground. In situations where they are necessary, footers are typically poured concrete and their exact depth is determined by local building codes and the location’s frost levels. Footers are not always necessary for a standard hobby greenhouse. This is the section that the structure rests upon. The footing refers to the point at which the structure meets the soil. One of the key components of a foundation is the footing. Essentially, the foundation is the complete system on which the greenhouse structure sits. The foundation used will be determined by the type of greenhouse, the building codes and, in some cases, personal preference. ![]() There are a few different types of foundations that can be used for greenhouses. When setting up a greenhouse, one of the most important aspects of the construction process is the foundation. ![]()
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