How To Install A Skylight On A Flat Roof

Steps To Install A Skylight On A Flat Roof

While most homeowners may be hesitant to do this task, framing a mounting curb to elevate and angle your skylight is quite a simple process. Of course, this project does require experience and knowledge of proper roofing techniques and safety. Improper installation can lead to frame and ceiling damage.

If you do not possess the needed skills and expertise for this task, then call the professionals at GoGreen Daylight Systems for help! Here is a quick, step-by-step guide for the installation of a skylight on a flat roof.

Step 1. Detailed Design Plan

• Start by determining the exact location where you’d like to place your skylight(s).
• Consider factors like the maximum opening angle and the opening mechanism.
• Size and tint must be considered, as well.
• Try to find skylights with a pre-soldered lip which helps make the installation process easier.
• You will need to design a mounting curb that is in place to raise the skylight at least 4 inches from the roof’s surface.
• The mounting curb should also tilt the skylight at a 15-degree angle.
• The inside dimensions of the curb need to be the same as the manufacturer’s specified dimensions for the skylight’s opening.
• Build this curb by framing together 2×6 boards.
• The curb needs to last a long time, so ensure it is sturdy enough to withstand any harsh conditions.
• Refrain from cutting through knots and drill pilot holes in order to nail the frame together.
• Brace two opposite corners of the curb until it is installed to retain its shape.

Step 2. Measure And Mark

• Use your chalk line, tape, and level during this step.
• Use these tools to accurately mark the skylight’s outline on the ceiling and roof.

Step 3. Cut Into The Roof

• Start by cutting away the ceiling beneath the skylight’s location.
• Remove both the insulation and wiring, at this time.
• If you have to cut through ceiling rafters, brace them temporarily until your skylight is properly framed.
• Scrape off the roofing material at the skylight’s location and cut open the roof using a saw.
• Drop plumb lines from each corner of the hole to ensure that it is in the right spot.

Step 4. Frame The Skylight

• Install header joists perpendicular to the existing roof joists around the skylight’s hole.
• Frame the light tunnel with your 2×6 board, if needed.
• Install your mounting curb above the opening.

Step 5. Install The Skylight

• Lay the skylight onto the frame and either screw or nail it into place.
• Cover the shaft using roofing material by slipping tar paper beneath the old shingles.
• Now lay the new shingles over the paper.

Step 6. Install Flashing And Insulation

• Install sheet metal flashing over a water and ice barrier around the skylight’s perimeter.
• Use a single piece of flashing in the front and step flashing up the sides of your curb.
• Install rigid insulation inside the light tunnel.
• This will prevent heat loss and condensation.

GoGreen Daylight Systems, LLC In Surprise, Arizona

GoGreen Daylight Systems, LLC is a Skylight contractor and installer of top-quality Tube Skylights, Traditional Skylights, Solar Attic Fans, and Garage Fans in Phoenix, the West Valley and East Valley. Contact us today for a free quote!