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Question DetailsAsked on 4/21/2013

Do I have to dig all topsoil away before we set our gravel base for our garage foundation

The garage will be a free standing building with a treated framed floor sitting on a gavel base for its foundation

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If you don't dig down to suitable structural material, you are just asking for frost heave, settlement, etc. You should check you local building code - it will specify how deep your foundation has to be, dependingon local frost depth, soil type, etc. Generally, putting any type of structure on a gravel pad is asking for subsequent movement which may damage the building. Remember, if you are putting in a wood floor, any movement in either it or the foundation walls will rack the other, and very easily cause structural damage.

While carports (not connected to the floor) are commonly put on posts or dug-in concrete pad foundations, this is not usual or recommended for a full garage.If you do put it on a gravel base (assuming you can get a building permit for this design) I would emphatically recommend two things - build it so the garagecan be shimmed up on its footing pads to relevel it, and do NOT connect the floor to the walls.

Answered 4 years ago by LCD




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