SIG Self-Flashing Deck Mounted Skylights
The best choice for sloped roof skylight windows replacement
Easy to Install
Manufactured with heavy aluminum for long term durability. The one piece welded curb and flashing make installation simple.
Beautiful and Durable
Tempered glass provides an energy efficient clear view. These low profile skylights look good on your roof.
When to use SIG Self Flashing, Deck Mounted Skylights
Suitable for Most Applications
We recommend our self flashing, deck mounted (FM, or flush mount) skylights for most applications, including installing or replacing skylights on any shingled pitched roof with a 3:12 or greater slope. Some of our skylights are sized to fit between standard rafters for easier installation.
Great Replacement Skylights
Our deck mount skylights are a superior option for fiberglass, acrylic, or plastic dome skylight replacement. We have many in-stock sizes that will fit between standard rafters, and sizes that will replace skylights from Velux, Wasco, and Suntek. If our in-stock sizes do not meet your needs, we will make one which will fit the existing opening exactly.
More about SIG Deck Mounted Skylights
Our deck mounted skylight frames are made with heavy, 6063-T5 aluminum, and are so durable they have a Limited Lifetime Warranty. Aluminum will not crack from weathering and may be sealed with any type sealer (not just silicone).
We specialize in custom size and custom shape skylights. Check out our Custom Size and Shape Skylights for more info and ideas.
These durable, easy-to-install sky lights are mounted directly to the roof deck. They contain a one-piece welded curb and flashing for easy skylight installation. No extra flashing kit is required! SIG has the widest flange in the industry (4-5/8″) which provides self flashing and a leak-free seal.
Simply use normal sealant, screws, and a good quality ice and water barrier to fasten and seal the roof skylight to the roof deck. The frame also has a condensate drain that carries to the outside any condensation that may occur due to excessive moisture in the home.
The deck mounted skylights have a condensate drain that carries to the outside, any condensation that may occur due to excessive moisture in the home.
Tempered insulated glass is the premier choice for residential skylight glazing. It stays transparent, is strong and provides for an energy efficient skylight. Moreover, glass will not crack, haze, yellow, or become brittle from UV exposure like plastics will.
Our stock glazing is double-paned, tempered, insulated glass with a bronze tint – a cost effective choice to reduce glare, UV and heat gain. Some sizes are also available in Solar Reflective glass, recommended for full sun skylights. Other glass choices are available for specific applications such as heavy shade or hurricane prone areas.
SIG’s deck mounted, self flashing skylights are ideal for DIY skylight projects. The elegant design is simpler to install when compared with the complicated flashing and sealing systems of other skylight brands, and are more durable than those with rubber flanges. See detailed installation instructions here.
Deck Mounted (FM) Stock Skylight Sizes
Inside Finished Opening in Inches
13½ x 13½
13½ x 24
20½ x 20½
20½ x 36½
20½ x 44½
22½ x 22½
22½ x 46½*
24 x 24
24 x 48*
26 x 42
30 x 30*
30 x 48*
34 x 52*
36 x 36
48 x 48*
* Also available in Solar Reflective glass, recommended for full sun.