I want to add a little onto my house next spring after it warms up, but I have a siding problem to figure out first. I don't know what the siding material is called or where I can find more of it. The house was built in 1977 and I'm sure the siding is original. The material is some kind of fiberboard about 12 inches wide and 1/2 inch thick. There are aluminum inserts between pieces where they are joined. Does anyone know what this stuff is called and if it's still available. I haven't been able to find it anywhere so far. The addition I want to do is just a small entryway, so I won't need very much of it. If I can't find any, I'll have to settle for having that part sided with something else, or I'll have to wait to do the project until I can afford to replace all the siding.