Do not take by mouth. Clocortolone topical is for use only on the skin. Wash your hands before and after using clocortolone topical, unless you are using the medicine to treat the skin on your hands. Apply a small amount to the affected area and rub it gently into the skin. Do not apply clocortolone topical over a large area of skin.
Your foundation should be at least 18 deep, and be 8 wider than your foundation wall. If you have an 8 foundation, you should have 4 on each side at the footing. So for a 8 foundation, the footing width would be 16.
Before calculating how many cubic yards of concrete you need for a slab 20-by-40 feet, you need to add the depth to the equation. The standard depth of a slab is 4 inches or 0.33 feet. You may need to check with your local building inspector to find out what the specific depth of the slab must be in your area.