The walls in my 1950's era house have the strangest composition I've ever seen. Cutting holes and repairing cracks is a challenge. From inside out, the wall consists of the following; 1. ~1/2" Gypsum board sheets - seem to all be 2' x 8', running perpendicular to studs/joists. 2. ~3/16" cement on top of the gypsum. The gypsum was mounted spaced apart so cement has keys between the gypsum sheets. Wire mesh at all corners. 3. ~1/8" plaster finish on cement, and this is what is painted and visible on the interior of the house. As you can imagine - 1 square foot of this wall material weighs about 10lbs! On the plus side it is an excellent sound deadening material. On the downside the ceiling walls are cracking along the keys - and I don't know the right way to fix this. Any help in identifying what this type of wall construction is called would be appreciated!

Hello all, This is my first post, long time lurker here. I hope this is the right section. On my old window frame, there are these rather ugly marks. [IMG]http://i1052.photobucket.com/albums/s451/apples555/Window_zpsh40m2ehc.jpg[/IMG] They are from window blind mounts. However, the blinds from my local department store have completely different mounts. Does anyone know what mount this screw pattern belongs to? I won't be staying in this house long actually, but these marks are really annoying. Thanks all.