I am getting ready to replace an old sliding glass door with a new window, but have a few questions. Here is where I am. The old window is about 8’ W x 7’ H. I am replacing it with and Anderson 3 pane casement window that is 72” W x 41” H. I am planning on leaving the header in place and then framing the area out for the new window and wall. Here are my questions:
1. The rest of the house (70 + yrs old) is not wrapped with Tyvek or any other house wrap under the wood shingles. Or I should say I am not sure if the rest of the house is wrapped. Does it make any sense to wrap this small area? If so should I use Tyvek or tar paper?
2. Is ½” OSB acceptable for the exterior walls or do I need to use plywood?
Any other tricks or suggestions would be much appreciated!