The 2 x 4 s should be no 2 kiln dried pine simply because it is cheap easy to work with and holds nails very well.
How to build concrete wall forms.
For a project such as this it is best to steer clear of quick drying cement formulas.
1 inch by 4 inch boards are generally stout enough for up to 4 inches of concrete.
Drive a nail into the concrete here.
Then pour your concrete inside the form using a chute or hose attached to the mixer.
Make sure you watch to see the falling concrete hasn t moved the strings.
The plywood needs to be of forming quality.
Thicker slabs require thicker sheathing which may be pine boards or plywood.
If properly maintained and used the consistency of steel forms can be obtained even for 2000 work cycles.
For a 5 in thick slab with thickened edges which is perfect for most garages and sheds 2x12 boards work best.
Place the first piece of wood sheathing along the string line.
Measure out from that nail to where the other face of your wall will be and place another nail.
Cut a 2x12 to length or splice it with a cleat for one side of the concrete forms and nail it to a corner stake.
If they will be reused then use treated lumber.
These are concrete forms made of steel.
Start by choosing straight form boards.
In america modern concrete homes are becoming very very popular.
The width and depth of the sheathing is dependent on the amount of concrete being poured.
Concrete wall form sections come in different sizes and shapes.
2 x 4 s and 3 4 forming plywood works best.
From this same 2008 issue of chemistry world magazine we learned that over two billion tons of concrete are produced every year.
Measure from the edge of your concrete footing to the point where the outside face of your wall will be.
This makes a lot of sense especially since according to chemistry world magazine concrete is the most widely used building material in the world.
To form a concrete wall first set up plywood boards on either side of your concrete footer and attach them together with wire.
So if your wall is 8 inches wide your two nails should be 8 inches apart.
The form will be lightweight and strong.
Level the 2x12 and nail it to the second corner stake.
To make the wall as strong as possible pour the concrete in layers no higher than 20 inches working from 1 end of the wall to the other.
A quick drying formula can end up causing more work for you later since you need to take time to pour and even out the cement.