Hi jan tramana, No foam is not the answer, fit batten size strips of wood over the hole and screw in both ends, 2 strips should do. Cut a piece of plasterboard slightly small than the hole and screw this up, fill gaps with filla.
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!