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Install Your Own Skylight Window

A homeowner's guide to safe and sensible skylight window installation, includes diagrams for building a skylight.

| March/April 1987

  • Home built skylight
    If you're wondering how to accomplish all this without destroying the interior finish of a cathedral ceiling, your fears are well founded.
  • 104-104-01-well_framing_01_01
    Diagram: Roof mount with splayed well; well framing.
  • 104-104-01-roof_install_01_01
    Diagram: Ceiling mount; roof installation.

  • Home built skylight
  • 104-104-01-well_framing_01_01
  • 104-104-01-roof_install_01_01

If the article in the last issue of MOTHER EARTH NEWS didn't convince you that a skylight window is a great choice for a low-cost remodeling project (see MOTHER NO. 103, pages 38 to 40, January/February 1987), perhaps this follow-up will. Why? Because we'll show you how to save up to half the cost of the job by doing the installation yourself. (See the skylight diagrams in the image gallery.)

Install Your Own Skylight Window

If you've never tackled anything like this before, it'll offer a mildly challenging, but very rewarding, learning experience. And even if you've done a fair amount of home carpentry, installing a skylight window will present an opportunity to hone your skills on a fresh technique. Either way, you'll have something worthwhile to show for your effort.

Plan Not, Pain Later

Let's assume you have a pretty good idea of where you want to put your skylight window and you're ready to price the model you have in mind. Don't run out the door and plunk your money down. Instead, climb into the attic with a tape measure and find out exactly what will fit in the area that's captured your imagination. Naturally, if your installation is to be in a cathedral ceiling-one in which the roof and interior ceiling sandwich the structural rafters-your job will be somewhat easier because you won't need to build a well to penetrate an attic space.

Measure the depth of the roof rafters and the distance they're spaced apart. Most likely, you'll have either 2 by 4s placed 16 inches on center or 2 by 6s set at 24 inch intervals. Check the area for wiring, plumbing vents, and other fixtures, and be prepared to reroute or move them if you have to. Also, look for structural interference: horizontal collar ties or vertical posts that support rafters and joists, or in the case of trussed roofs, braces and struts that share the roof load. With the former, you can usually work around the components or reposition them. Trusses are less forgiving and will probably require the advice of a structural engineer or the building inspector.

Most skylights are designed to fit standard rafter spacings and come in lengths varying from 2 feet to 6 feet. It's usually best to cut through no more than one rafter, so consider buying the narrowest skylight that will fit between three rafters and making up the area difference in length. When a rafter is cut, it's standard procedure to support the loose ends with headers, or boards fastened between adjacent rafters. Doubling up headers is common practice, but with the largest skylights, you may have to double the rafters as well. If you can't tie in to the ridge at the peak of the roof and the top plate of the wall below, merely "scabbing on" to the outside of the rafters with two-by's twice the length of the skylight opening will help stiffen the structural members.

If you're wondering how to accomplish all this without destroying the interior finish of a cathedral ceiling, your fears are well founded. The simplest solution is to choose a lightweight, moderately sized skylight that won't require extra support. Then you can merely cut away the ceiling material to match the hole. Should you need to do additional framing, though, accept the fact that you'll have to disturb the drywall to each side of the opening, and then some, to fit the double rafters properly.

4/14/2015 8:44:37 PM

I'm not sure if I should install my own skylight, or have someone do it for me. It may save me some money short term to do it myself. On the other hand, if I compromise the integrity of my home, it wouldn't be worth the money I save doing it myself.

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