If you screw the frame together with screws through the sill and into the studs, what surface treatment should you use? I was thinking of using 2-3 pieces of 6x120 or so depending on the stud dimension. I found screws with a yellowish coating at Hornbach, Biltema has a version that is said to meet corrosion class 4, whatever that is, claimed to correspond to stainless steel.
Anyone have tips on surface treatments and where to buy them?
/Anders