Ensure always that slabs or blocks are fixed down firmly, using a cement mixture that will become solid. The base can be built above ground level if desired, negating the need for digging out the area beforehand. Check the sizing of the base first and even mark it out on the ground using a spray paint before you start so that you’re 100% certain that the base will fit neatly on top. This could be made from breeze blocks, paving slabs or concrete. The next option is to build a solid perimeter for the base to sit on. Perimeter Baseīreeze blocks make for an ideal solid perimeter for greenhouses It’s also possible for rodents to tunnel inside. The inside can also become waterlogged and muddy. However, there’s also a risk of the frame subsiding, which would lead to the greenhouse frame warping and then the possibility of glass breaking. It’s also the most cost effective option. Sitting the greenhouse on a soil base with concreted in leg posts means that you can plant directly into the soil inside the greenhouse and that there will be good drainage. Both can be cheaply hired from a local tool hire shop. If the area that you intend to build your greenhouse is not level, or has a slight slope, then it would be advisable to build it up using more soil and then compact it down firmly using a roller or a vibrating plate. This will only be suitable for greenhouses up to 8ft x 10ft, as larger than this size will mean the weight of the frame and glass would slowly push the base into the ground, especially after wet weather. It might be necessary to support the frame in place whilst the concrete goes hard. If the site of the greenhouse is on well compacted, firm soil, the cheapest and easiest option is to concrete in the four posts at the corners of the frame, ensuring that it is completely level before the concrete sets. The following are different types of foundations for your greenhouse base: Soil/EarthĮnsure you have a level base before construction Do not be tempted to take shortcuts with the preparation of the base, as this will inevitably lead to problems later on, possibly costing a lot of money in replacement glass, or even a new greenhouse! Take the time to consider the positioning of your greenhouse and assess the soil underneath it, if it is light and sandy then concrete or slabs is the only choice you will have. The base must be secured to the ground, if it is not then it will be able to move, or in the worst possible scenario, the whole greenhouse could be lifted off the ground in high winds – with disastrous consequences! This can be secured and levelled prior to the construction of the rest of the frame making the job far easier.
Most greenhouses come with a metal frame base that is separate from the building itself. If there is one thing that is absolutely vital when you build your greenhouse, it is that the base upon which you build it is secure and level. Lay the correct foundation for your greenhouse
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