The most popular style of conservatory foundation, with varying widths depending on the type of soil used. In general, the minimum width is 450 mm, and the minimum depth is 225 mm. The slab needs to be deep enough to prevent water reaching the bottom of the walls.
The maximum recommended thickness for a concrete slab depends on the type of soil used under the building but is usually 1.2 m or 4 feet. Thicker slabs are needed for sites that are prone to flooding or where there is a risk of damage from an earthquake.
Thickness affects how much weight it can bear before it starts to fail. For a given type of soil, a thicker slab will be able to carry more people than a thin one. However, a thick slab is harder to work with and may not lay flat, so space will be taken up by uneven surfaces. It's a trade-off between strength and ease of construction.
Conservatories need to be built up from floor to ceiling on all sides to provide adequate lateral support. This means that the slab needs to be at least as wide as the conservatory itself. Most commonly, the slab is about 1.5 times as wide as the wall panels it supports. This allows for some leeway if they don't exactly match up in height after installation.
A tiny conservatory is typically 8' x 8' in size, whether you have a small yard or just want to create a nice spot to unwind. The most common size for a tiny conservatory is 10' x 8'. A modest lean-to conservatory will be the best option for compact places. Some homeowners choose to use a tiny conservatory as an outdoor room. In cold climates, this is a great way to enjoy summer evenings inside when it's not quite warm enough yet outside.
The smallest available conservatories come with glazed walls and a roof made of glass or polycarbonate panels. You can find some conservatories that are half the size of this one but they don't offer much more space. Tiny conservatories are perfect for adding color to your home during warmer months or for using as a hobby room or office when you need a little more space.
If you want a bigger conservatory, there are several options available. You can go up in size to 12', which is the typical size of a medium conservatory. These days, many large conservatories are also made out of glass so you can still get all the benefits of natural light while still having some privacy. Or, if you want even more space, consider a solar-powered greenhouse. These structures can be as large as 40' x 60' and usually contain windows that let in sunlight while providing protection from wind, rain, and other weather conditions.
Foundations for a single-story building strip will normally be 450 mm wide and at least 200 mm deep, while foundations for two-story buildings will be 600 mm wide and 200 mm deep. What should the depth of concrete footings be? Footings should be installed at a depth of at least 12 inches below previously undisturbed soil. The goal is to provide support that can't be removed by ordinary street pressure.
The requirement for deep foundations is based on engineering principles that require the load acting on a structure's foundation to be transmitted into the ground. If the force isn't transmitted into the ground, it will cause the structure to fail. For example, if a car crashes into a shallowly buried concrete pole, only half the weight of the car will be transmitted into the ground and there is a high chance that the pole will fail under its own weight before being damaged by the vehicle.
The deeper the better. The problem is that cost increases dramatically with depth. Deep foundations require more material than shallow ones and also more time to complete. A typical residential foundation requires about 20 cubic yards of concrete, which costs about $10,000. A foundation this size should be at least 18 inches deep.
The requirement for deep foundations is recommended, but not required by code. Some codes may allow for less depth if the builder can show that the proposed foundation design meets all other requirements of the code.