Anderson Skylight Window Leaks

To fix a leaking skylight.

Anderson skylight window leaks.

Leaks at skylights left unattended can lead to costly structural damage rotted roof sheathing rotted roof framing and wet moldy insulation as well. I also see water stains on the bottom of the wooden window frame suggesting there has been wind blown rain or snow melt leakage too. Then lift it off and keep it to one side. Two years later after a downpour one of the other skylights developed a leak.

Sloped glazing such as roof skylights probably has historically had more leaks into the roof structure due to improper roof flashing than other window failure causes. Take a moment to seal any cracks you find on the cover with the clear silicon caulk. 2 using a caulking gun loaded with a tube of roofing cement force the mastic up under the shingle where the metal flashing meets the roofing felt the thick black paper under the roofing material. It is pre molded seamless and waterproof polyur.

Unscrew the fasteners holding the cover of the skylight window on with an appropriately sized driver. At the time of installation 3 years ago our contractors had a anderson rep out to replace seals in 4 or 5 of our brand new skylights. Then press down on the roofing shingles to seal them tight. Our new anderson skylights leak.

Anderson rep said seal was defective. Original installation squareness. Start by checking that the windows are basically square in the frame. I think your anderson slider window has more than air leaks.