Why is there water pooling inside my window frame?
Almost always blocked weep holes, not a failed window. Every modern window is designed to let a certain amount of water into the frame — driven rain gets past the sash, and that is expected. Small slots at the bottom of the exterior frame, called weep holes, drain it back out. When debris blocks them the water has nowhere to go, so it sits against the sash and the sill. Left through a winter that is how frames rot, seals fail, and stains appear on interior trim. Clearing them takes seconds per window, requires no parts, and almost nobody does it.
Can it be fixed?
Not a glass problem
This is worth being clear about: it is a drainage problem, not a glass problem, and no amount of window cleaning addresses it. That is exactly why it is worth knowing about — homeowners pay for cleanings for years while the actual damage mechanism goes untouched. Clearing weep holes is fast and free of parts, and it is the single most consequential maintenance item on a window. If the frame has already gone soft, that is repair or replacement territory, and no cleaning or clearing reverses it.
Weep holes are deliberately small, which makes them easy to block. A single wad of cottonwood cotton, a pine needle, an insect nest, or compacted dust and grit is enough.
In cottonwood markets, June fiber packs them within days of the drop.
In conifer country, needles wedge into them and hold, and pitch binds the mass together.
In windy, dusty markets, fine grit compacts into the channel over years and cements into a plug — the slowest and most-missed version of the problem.
Some weep systems have small hinged flaps on the exterior. Those flaps stick shut with age, paint, or debris and stop functioning while looking perfectly normal.
Nothing, when done as part of a window cleaning by a crew that knows to do it. Sold as a standalone service it is not worth anyone's money. The cost only appears when it has been neglected for years and a frame or sash needs repair — which is a carpentry expense many times any cleaning bill.
One of the highest-value DIY tasks on a house. Find the small slots along the bottom of the exterior frame. Clear them with a vacuum crevice tool, a piece of stiff wire, or compressed air — gently, because forcing something rigid into the channel can damage the drainage path. Then pour a small amount of water into the bottom track and watch: it should exit the weep holes within a few seconds. If it does not, the blockage is deeper in the channel. If your windows have exterior flaps, check that they swing freely rather than being painted or stuck shut.
Removing it once is half the job. This is the half that determines whether you pay for it again next year.
This problem is not evenly distributed. These are the markets where local conditions make it common, and why.
Bosque cotton packs weep holes within days of the June drop.
Cotton in June, heavy valley leaf in November — two blockage events a year.
Ponderosa needles wedge and hold, and freeze-thaw at elevation makes trapped water genuinely destructive.
Conifer needle litter combined with severe freeze-thaw at nearly 7,000 feet.
Pine litter and mountain freeze cycles; the classic setting for slow frame rot.
Yes — that is normal and expected. Windows are designed to admit a small amount of driven rain into the frame and drain it back out through weep holes. The failure is not water entering; it is water not leaving.
No. This is the most common and most expensive mistake with this problem. Sealing them traps the water that was always going to enter and removes its only exit, which accelerates exactly the rot you were trying to prevent.
Pour a cup of water into the bottom track from inside and watch the exterior frame. It should exit within a few seconds. If nothing comes out, or it seeps slowly, the channel is blocked.
Once the material has gone soft it is a repair rather than a maintenance question, and clearing the weep holes at that point stops it getting worse but does not reverse it. Depending on the frame material, that is a carpentry repair or a sash replacement. Getting the drainage working first is still the right immediate step, because otherwise the repair fails the same way.
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