Doors and Windows - What is RO sill?

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Glyder
05-03-09, 02:04 PM
I just purchased 14 vinyl window inserts and I am reading the directions prior to installing them. One of the directions is: "Be sure drain holes or 'weeps' are located next to the RO sill." What is a RO sill?

Just Bill
05-03-09, 04:50 PM
"RO" usually refers to the "rough opening". Replacement windows are installed into existing window frames, I asume they are referring to the existing exterior sill. I have been doing windows for 24 yrs, and do not recall ever seeing a notation like that. I have to assume that they mean, do not install the window backwards??????? The drains holes are supposed to drain to the outside.
GBR in WA
05-03-09, 06:49 PM
Bill is correct. I think they mean weep holes - down - next to the sill (bottom), not up (next to the header). They could say "window sill", not RO. Be safe, G