If you’re planning on pouring concrete, you’ll need to know how to build concrete forms. Forms are the molds that hold the wet concrete in place until it dries and hardens. They can be made out of wood, metal, or plastic, but no matter the material, the process is largely the same.
Choosing Your Materials
Before you start building your forms, you’ll need to decide what material you want to use. Wood is the most common choice, but metal and plastic forms are also available.
Wood Forms
If you decide to use wood, you’ll need to choose between plywood and dimensional lumber. Plywood is easier to work with and will give you a smoother finish, but dimensional lumber is more durable and can be reused multiple times.
Metal Forms
Metal forms are more expensive than wood or plastic, but they are also more durable and can be reused many times. They are typically made out of aluminum or steel and come in a variety of sizes and shapes.
Plastic Forms
Plastic forms are lightweight and easy to work with, but they are not as durable as wood or metal forms. They are best suited for small projects or projects with curved or irregular shapes.
Preparing Your Site
Before you start building your forms, you’ll need to prepare your site. This involves leveling the ground and making sure it is compacted and free of debris.
Measuring Your Site
Measure the area where you want to pour the concrete and mark the corners with stakes. Use a string line to connect the stakes and make sure the lines are level.
Digging Your Footings
If you are building a foundation, you’ll need to dig footings. Footings are the concrete pads that support the weight of the foundation walls. The depth and width of the footings will depend on the size of your foundation.
Building Your Forms
Once your site is prepared, you can start building your forms.
Cutting Your Wood
If you’re using wood forms, you’ll need to cut your boards to size. Use a circular saw or table saw to cut your boards to the correct length and width.
Assembling Your Forms
Assemble your forms on top of the string lines you set up earlier. Use screws or nails to hold the boards together, making sure they are level and square.
Adding Braces
Add braces to your forms to keep them from bowing or bending. Braces can be made out of scrap wood or metal stakes.
Frequently Asked Questions
What is the best material to use for concrete forms?
Wood is the most common material used for concrete forms, but metal and plastic forms are also available. The best material to use will depend on your project and your budget.
How long do I need to leave the forms in place?
The amount of time you need to leave your forms in place will depend on the size of your project and the weather conditions. In general, smaller projects can be removed after 24-48 hours, while larger projects may need to stay in place for several days.
How do I remove the forms?
Use a pry bar or hammer to loosen the forms from the concrete. Be careful not to damage the concrete as you remove the forms.
Conclusion
Building concrete forms is an important part of any concrete project. By choosing the right materials and following the proper techniques, you can ensure that your forms will hold up to the weight of the wet concrete and produce a smooth, even finish.