windows - The sill plate touching my foundation isn't laying flat, it's about 10 degrees tilted. How do I install a header below it? - Home Improvement Stack Exchange
SureSill 3-1/4 in.x80 in. Channel Plate for Sloped Sill Pan for Vinyl Sliding Doors and Window Installation Flashing (Case of 10) SS 3_32C 080 - The Home Depot