How to Install a Skylight Tube

Bring loads of natural light into an interior space with a skylight tube. The idea of cutting a hole in a roof may be intimidating, but this project can be completed in a few hours with midlevel DIY skills.

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Measure and Cut Extension Tube

Use tape measure to determine height of gap between installed bottom (ceiling) tube (Image 1) and top (roof) tube (Image 2). Transfer measurement to extension tube piece, adding 6 inches total for a 3-inch overlap on each tube. Cut with tin snips (Image 3).

Install Extension Tube

Peel off protective coating and line up extension tube with ceiling and roof tubes. Wrap extension piece on outside of tubes and use adhesive strip provided in kit to secure. Tape seams with duct tape.

Install Dome and Diffuser Lens

Line up dome onto roof piece and secure with screws (Image 1, 2). Do not over-tighten screws and crack dome. Apply an exterior silicone over dome screw heads with caulk gun. Inside room, click diffuser lens into place. Tip: Keep an eye on skylight tube during first rain to make sure waterproofing was successful. If not, more roofing cement, flashing and/or silicone may be required.

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