- 1 What can I use for concrete forms?
- 2 What can I use for flexible concrete forms?
- 3 How wide are concrete forms?
- 4 What do you use for round concrete forms?
- 5 Can you pour concrete directly on dirt?
- 6 Do you need gravel under concrete?
- 7 How do I make concrete forms?
- 8 Do you need rebar for 4 inch slab?
- 9 Can I use plywood for concrete forms?
- 10 Can you use OSB for concrete forms?
- 11 How do I build a concrete wall form?
- 12 How do you color concrete?
- 13 How long does it take for 4 inches of concrete to cure?
- 14 When can I remove forms from concrete slab?
What can I use for concrete forms?
Wooden boards have always been the go-to choice for concrete forms. However, not just any boards will do. A contractor must carefully consider the dimensions of the wood they use, otherwise, the results may not meet expectations.
What can I use for flexible concrete forms?
Hardboard is inexpensive form material and is easy to flex into smooth curves. Hardboard siding is intended for exterior walls, but it’s also great stuff for forming curves because it’s flexible and cheap.
How wide are concrete forms?
Form sizes are in 1″ increments from 4″ to 24″ wide. Heights vary between 2′ and 10′.
What do you use for round concrete forms?
Plywood. Plywood can be used for large circles where the arc is wide and gentle. They can be scored on the back with cuts about 2/3 the depth of the board, spaced about every half inch along its length. This will increase the flexibility of the wood as the cut spaces will expand as pressure is applied to bow the board.
Can you pour concrete directly on dirt?
Long story short, yes you can pour concrete over dirt.
Do you need gravel under concrete?
Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.
How do I make concrete forms?
Fill and Level
- Spread and tamp three-inch layers of granular fill to within five inches of the top of the forms.
- Stretch a string across the top of the forms and measure down to the ground.
- Subtract the thickness of your slab.
- Slope the fill down along the edges to create a thickened edge of concrete.
Do you need rebar for 4 inch slab?
No, you do not need rebar for a 4–inch slab of concrete on grade. A 4–inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. Rebar is recommended on concrete measuring 5 – 6 inches thick.
Can I use plywood for concrete forms?
Plywood is economical to use for wall and floor forms; however, plywood used for this purpose should be made with waterproof glue and marked for use in concrete forms. Plywood is warp-resistant and can be used more often than other lumber. Watch for protruding nails.
Can you use OSB for concrete forms?
Typically, both OSB and plywood can be used in concrete forms, but plywood is the best option for concrete forming applications. Plywood is the better choice; its structure doesn’t unravel following constant exposure to water.
How do I build a concrete wall form?
Once your concrete footing that will support your homemade wall is complete, you can follow these steps to form the wall.
- Measure for the wall.
- Place nails at least 8 feet apart.
- Nail a 2-by-4 to the concrete footing.
- Cut plywood.
- Cut some 2-by-4s.
- Nail the plywood to the 2-by-4.
- Use a level.
- Repeat on the other side.
How do you color concrete?
6 ways to color concrete
- Integral coloring. Colorant added to concrete during mixing produces uniform color throughout the slab.
- Shake-on colors. Shake-on color consists of finely-ground pigments and dry cement that is “broadcast” onto freshly placed concrete.
- Acid Stains.
- Acetone dyes.
- Water-based dyes.
- Color hardener/densifiers.
How long does it take for 4 inches of concrete to cure?
When waiting for concrete to dry, keep these timeframes in mind: 24 to 48 hours – after inital set, forms can be removed and people can walk on the surface. 7 days – after partial curing, traffic from vehicles and equipment is okay. 28 days – at this point, the concrete should be fully cured.
When can I remove forms from concrete slab?
- Walls and columns can be removed after about 24-48 hours.
- Slabs, with their props left under them, can typically be removed after 3-4 days.
- Soffits, with their props left under them, can be removed after one week.
- Props supporting slabs under 15 feet can be removed after one week.