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One of my large upstairs vinyl window frames is leaking rainwater onto the window sill. The base of the frame is filling up with water, which is then overflowing onto the sill, where the window meets it. By comparison, the bottom of the adjacent window frame (which isn't leaking) does not have any water in it.
I don't know whether water is SUPPOSED to get in, but then drain out, or whether it shouldn't enter to begin with. Any suggestions greatly appreciated.
Yes, vinyl windows are designed to allow water to get into the vinyl frame and then drain out the “weep” holes.
Little known fact, the actual “seal” is between the glass and the BACK of the frame. That is to say, there is a black seal strip between the glass and back of the frame. The “stops” on the exterior are just to hold the glass tight to the seal. The stop is NOT designed to stop rain water.
The weep holes are designed to allow the water out of the frame. Perhaps the weep holes are plugged and need to be cleaned, but to answer your question, yes, water is suppose to get in the frame and then drain out.
Btw, the mitered corners are supposed to be welded together. I’d check to make sure the weld has not been broken, because water could then leak out onto the window frame as you describe.
Blocked drainage. Try poking the holes were the water is filling up inside the frame the holes i am talking about is the long slots about 20mm long. Try a plastic straw .to unblock the obstruction. Then pour some water in the holes to see if the water drains outside onto the cill.
