I had quite a few emails asking for photos of this method of installing building flats that I mentioned in a post last week.
My problem was how to attach flats to my painted masonite backdrop where flats had to overlap. Not all could be in direct contact with the masonite and I didn't want to get glue or tape on the front of any flat.
First, I screwed a sheetrock screw into the masonite in the place where the flat would stand. The screw was left extended by an amount equal to the distance that the building flat would stand away from the backdrop. In this photo, the flat was almost right up against the backdrop so the screw was driven almost flush with the backdrop.
A small neodymium magnet was placed on the screw head. These are available very reasonably on Amazon or the bay. Search for "rare earth" (or neodymium) magnet. You can see the remnants of a failed duct tape loop attachment on the backdrop that led to my coming up with this magnet method.
Next, a metal plate (steel or iron) was attached to the rear of the building flat, roughly in line with the position of the screw. This flat was 3/4" pine so I used screws. You could also attach the plate with contact cement or duct tape depending on the material of the flat.
Place the flat in position and the magnet will do the rest. You could use more than one screw/magnet for more stability if desired. The building just installed was the gray tower on the right.
The tan building to the left of it was installed the same way except that the screw was left extended away from the wall so the flat would stand in front of the others in the scene.
Jim