How to Fix a Sunroom Leak

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Sunrooms usually have a wall of windows that sometimes extends to the ceiling.
Sunrooms usually have a wall of windows that sometimes extends to the ceiling. (Image: Creatas Images/Creatas/Getty Images)

Sunrooms are often relaxing and aesthetically pleasing, but because they rely on a lot of windows to let in sunlight, they are susceptible to leaking. Leaks need fixing as soon as they happen because moisture buildup damages your walls and floors while also inviting mold growth. Mold inhalation causes health problems, including asthma, in many people. The most common location for sunroom leakage is in the seams between glass panels. Inspect these seams as soon as you suspect a leak to get the problem fixed as quickly as possible.

Things You'll Need

  • Sewing needle
  • Razor blade
  • Caulking tube
  • Caulk gun
  • Masking tape
  • Roof sealant

Inspect the weep holes at the bottom of the track on each window in the sunroom. These holes often get blocked with dirt and debris; this results in leaks because the windows can't drain water appropriately. Use a sewing needle or other pointed object to clear the weep holes so the windows operate properly.

Check the caulking on each window. If the caulking looks worn, pitted or is coming out of the frame, it needs replacement. Remove the old caulking by carefully scraping it out with a razor blade. Wash the area with a soft sponge and mild detergent once the caulking is removed and let the area fully dry. Reapply fresh caulk to the seam, using a waterproof caulk and caulk gun. Follow all instructions on the caulk tube for best results.

Replace any glass panes that have cracks in them. Even a tiny fracture leaves an opening that water can seep through. Run masking tape across the glass several times to protect it against shattering as you remove it. Scrape off the caulk with the razor and lift the glass out. Scrape off any remaining sealant around the frame and add a fresh application of caulk. Place the new pane into the frame and then caulk the window again to ensure a watertight seal.

Add additional roof sealant around the flashing on the roof if your sunroom has a chimney. The flashing is the metal connection between the roof and the chimney and leaks often form in the space between the two. Fresh sealant helps prevent this and closes any openings that water may be seeping through.

Tips & Warnings

  • You'll need a ladder to inspect any panes that are higher up. Be careful whenever leaning a ladder against a window to ensure the window doesn't suffer damage.

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