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Skylights will eventually leak. It is just a matter of when. When a skylight start leaking, it is very likely the gasket seal has cracked between the glass and the metal frame. Most people will use some caulking to try and repair the skylight leak. Here are 4 things you should never use to fix a skylight: Caulking – whether it is latex, silicone or urethane caulking, it will always failTar – any tar out of a can will fail – it dries and cracksTapes – It is very temting to get a roll of tape and seal over the frame and glass, this will fail prematurelySpray Sealant out of a can – that is by far the worst so called sealant Watch this video to see how to repair a skylight. 5 Steps on repairing a skylight leak Wipe clean the glass or plexiglass and frame with a water soaked ragRemove any old caulking and tapes. Soak a rag with Lacquer Thinners to remove Silicone or Tar residueUse masking tape to tape of the glass area approx. 112″ from the frameUse 80 – 100 grid sand paper to rough up the glass and frameWipe clean all the dust with dry ragApply 1 thick coat of Super Silicone Seal covering the glass from the tape to over the frameFill the gap between the metal frame and glass with sealantCut the Polyester Fleece in half so you end up with a 2″ stripEmbed the fleece in the Super Silicone SealAd a final coat over the fleece making sure the fleece is completely coveredRemove the masking tape emediatly after the silcone seal is painte onTake a dry rag and wipe of any excessive sealant that got spilled on th e glass area Expert advice on how to repair a skylight, including help with leaks and condensation problems.Because skylights interrupt and penetrate the surface of a roof, they are particularly prone to leaking. Rainwater flows down the roof, collects at the top of the skylight, builds up, and eventually finds a place around the edges where it can come dribbling inside.Various Types of Roof and Skylight FlashingSkylights are typically manufactured with their own integral metal flashing—a flat metal flange that extends from the body of the skylight and tucks underneath the roof shingles.In some cases, a skylight is set up on a curb that is flashed with continuous flashing along the base, step flashing up the sides, and saddle flashing across the top, similar to the way a chimney is flashed. This is described in greater detail below.Before you crawl into the attic to find the source of the leak, consider the possibility of condensation.Skylight CondensationIf you have a roof leak that appears to be at the skylight, the first thing to do is rule out condensation as the source. A skylight in a humid room, such as a bathroom, can drip moisture—it appears to be a leak, but it isnt. When the warm, moist room air reaches the cold glazing of the skylight, it condenses, and drips down. The way to solve this is to reduce the humidity in the room. For more about this, improve the ventilation or check into a dehumidifier.How a Skylight Is BuiltA skylight is like a window in the roof, but its frame is designed and flashed to withstand the rigors of rainfall that a roof receives. As shown at right, a skylights flashing works in concert with the roofing material to usher away rain and snow.Integral flashing is built onto the perimeter of some skylights. © Don Vandervort, HomeTipsThough some frames are solid wood or aluminum, most new skylights are made of a combination of metal, vinyl, and wood. The exterior frames tend to be aluminum cladding with a durable finish—the part you see inside is often made of solid wood, plywood, or white vinyl. Newer skylights are virtually leak-free thanks to rugged construction and easy-to-install, integral flashing. Theyre also equipped with channels that carry away condensation.The cross-section view of a glass skylight shows key parts and how the flashing provides continuous drainage down the roof.Cross-section View of Glass Skylight © Don Vandervort, HomeTipsA skylights shaft (see below) governs how light is delivered to the room below. If all four sides are flared, light spreads over a wide area. A shaft with perpendicular sides focuses the light straight below. If the shaft is flared on only one or two sides, it sprays more light in the flared direction.Main Types of Skylight Shafts © Don Vandervort, HomeTipsFixing Skylight LeaksIf your skylight leaks, chances are good that the problem is the seal between the flashing and the roof. Identifying where the leak is originating is the first step. For more about troubleshooting a roof leak, please see How to Find & Fix a Roof Leak.To fix a leaking skylight:1 Lift up the shingles next to the skylight one at a time and brush out any dirt and debris.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). Then press down on the roofing shingles to seal them tight.3 Seal any obvious holes, open seams or joints in the flashing, too. For this, you can use the same roofing cement. Do NOT seal weep holes in the skylight frame that are designed to carry away water.4 Also check the seal where the skylights glass meets the frame. If you see any signs of leaking, seal this with clear silicone caulk.Featured Resource: Find Local Pre-Screened Skylight Repair ProsTagged sky lightskylightskylights
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