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Why Does Rain Come in Through My Window Frames?

Last updated October 25, 2026

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The short answer

Common Causes

The most common reason rain comes through a window frame is failed sealant. Caulk and weatherstripping dry out, crack, or pull away over time, leaving gaps that water can slip through. If the sealant looks brittle or missing, that is likely the culprit.

Another frequent cause is improper installation. If the window was not flashed correctly or the frame lacks a drip edge, water can run down the face of the house and seep into the frame. Poor slope on the sill can also let water pool instead of draining away.

How Water Gets In

Wind-driven rain can push water into tiny gaps that would stay dry in calm weather. The higher the wind, the more pressure it puts on the water, forcing it into cracks around the frame. This is especially noticeable on the side of the house facing the storm.

Water can also enter through the top of the frame if the head flashing is missing or damaged. Capillary action can draw water up into small spaces between the frame and the wall, making it seem like the leak is coming from nowhere obvious.

  • Check the sealant around the entire frame, inside and out
  • Look for gaps between the frame and the siding or trim
  • Inspect the drip edge at the bottom of the sill
  • See if the window itself is seated tightly in the frame
  • Feel around the frame after a rain to locate the wet spot

What to Look For

Start by examining the exterior of the window on a dry day. Look for cracked or missing caulk, peeling paint, or any visible gaps. Push gently on the trim to see if it moves or has separated from the wall. These are all entry points for rain.

On the inside, check for water stains, damp drywall, or peeling paint near the window. If you see any of these, water has been getting in for a while. You might also notice a draft, which indicates the frame is not sealing properly.

Quick Fixes to Try

If the sealant is cracked, you can remove the old caulk and apply a fresh bead of exterior-grade sealant. Make sure the surface is clean and dry before you apply it. This can stop leaks around the frame for a year or more.

Replacing the weatherstripping on the window sash can also help, especially if the leak is around the moving parts. If the sill is sloped toward the house instead of away, you may need to install a drip cap or adjust the slope. These are jobs a handy homeowner can often manage.

When to Call the Pros

If the leak is coming from above the window or you see water running down the wall inside, the problem may be beyond simple sealant. Flashing issues or a poorly installed frame can require more involved repair. In that case, local water damage pros can assess the damage and suggest next steps.

Water that has soaked into the wall or drywall needs attention before mold sets in. If you notice soft drywall, musty smells, or recurring leaks, have a water damage inspection done. The pros can also help with drying and dehumidification if water has been trapped inside the wall cavity.

If the leak has been going on for a while, trapped moisture can lead to mold and rot. Acting quickly matters, especially in humid climates where dampness lingers. The pros can help dry out the wall cavity and stop the cycle.

  • Water stains or bubbling paint on the ceiling or wall near the window
  • Soft or crumbling drywall around the frame
  • A musty odor that gets stronger after rain
  • Visible mold or mildew on the frame or nearby surfaces
  • Recurring leaks even after you have re-caulked

Talk to someone now

Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

Can I just re-caulk the window to stop the leak?

Re-caulking can stop a leak if the sealant is the only problem. Remove the old caulk, clean the area, and apply new exterior-grade sealant. But if the frame is not flashed correctly or the sill slopes wrong, caulk alone will not fix it.

Why does rain come in only during heavy wind?

Wind-driven rain pushes water into gaps that would stay dry in calm conditions. The pressure from the wind forces water into small cracks around the frame. If you see leaks only during storms with strong wind, the seal is likely failing in those spots.

Should I worry about mold if the leak is small?

Any moisture can lead to mold, especially in a humid climate like Detroit's. If the leak is small but recurring, the damp area can still support mold growth. Check for musty odors or dark spots, and dry the area thoroughly after each rain.

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