The following are some good construction practices to follow when building your floating slab:
- Floating slab are to rest on undisturbed soil. Remove all organic material from beneath building.
- Ensure the subgrade is uniform and sufficiently compacted.
- Provide good site drainage by sloping all surface grades and the subgrade. Surface grades should be a minimum 5% grade (3inches in 5 feet)
- Dampen subgrade before placing the concrete.
- Never pour concrete on frozen subgrade.
- Minimized concrete shrinkage by using a low slump (stiff mix).
- Don’t add water on site during placement or finishing.
- Use chairs to support the slab reinforcement mesh at the correct height during concrete pouring.
- The thickened slab area rebars in the slab corners should be continuous.
- Don’t over-trowel to help prevent cracks.
- There should be a sill anchor bolt 1’-0” from each corner of the slab. The rest of the sill anchor bolts should be imbedded into the concrete as per the stamped drawings or municipal handout drawing.
- Keep concrete moist for 24 hours
- Protect concrete from wind & direct sun
- Keep concrete temperature above 10 degrees during and for 3 days after placement.
Engineering for floating slabs is provided by Waddell Engineering.