Get a piece of 3x2 timber about 10" long. Pass the down through the hole and screw through the existing floor into its ends. Cut a piece of chipboard to fit the hole and screw it into place.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!