What does this mean: water repellent preservative to comply with WDMA I .S .4
I was reading a website that sold wooden storm windows and it mentioned items like:
Preservative treat to AWI specifications for long life
water repellent preservative to comply with WDMA I .S .4.
I spent some time googling and found the WDMA website but could almost no useful information. I may be working on our wooden storms and thought it might be useful to know what this really meant.