If you have a concrete ... a second layer of plywood over the top to strengthen and stiffen the surface. You should then add a layer of backer board (or cement board) for floors, which is a ...

If you have a batch of concrete to mix but nothing to mix it in, try a 4- x 8-ft. sheet of 1/4- or 3/8-in. plywood ... sheeting and affix it to the floor with duct tape on all four sides.

Concrete's strength and structural integrity come not only in its material properties, but also from how it's molded during construction. An architecture student has devised a clever way to build ...