Skylight Installation Existing Roof

How to install water management protection around a new or existing skylight unit in conjunction with installation of exterior roof deck rigid foam insulation the following steps describe how to remove and re install a curb mounted skylight as part of a reroofing project where rigid foam insulation is going to be installed above the roof deck.

Skylight installation existing roof.

Cover the bottom flange with a strip of membrane that extends 6 inches past the skylight s sides. To install a skylight start by cutting a hole through the roof and ceiling from the outside that s large enough to hold the skylight. Cut the extensions at a 45 degree angle out from both corners of the skylight. Install the bottom flashing a single piece that wraps partway around the skylight and sits on top of the roof shingles figure 3.

The rooftop portion of the skylight installation includes cutting the hole and fastening the skylight to the roof with the three layers of protection found in velux no leak skylights. Step 4 seal the sides photo by anthony tieuli. Drive 1 inch galvanized roofing nails through the holes in the skylight s flange and into the roof. Be sure your ladder is the right type and height and that you are wearing footwear with the proper traction.

Typical prices range between 958 and 2 348. Additionally wait for a. Next drive 4 deck screws through the roof from the inside to hold the skylight in place. Then lay sheathing around the hole to prevent water leakages before inserting the skylight.

I had a velux certified installer replace an existing skylight that was cracked. According to hundreds of surveyed homeowners it costs an average 1 614 to install a skylight. Depending on the slope of your roof you may want to consider using roof jacks to support a 2 x 12 board to stand on while you work when doing so secure the roof jacks with nails and make sure the nails are driven into the roof joists and not just through the sheathing. In order to remove a rafter designed to hold up a portion of roof we have to compensate.

A skylight installation in an existing roof requires re shingling certain sections of your roof so hold off on starting this project until you need your roof replaced. Next slip individual pieces of step flashing under the shingles. A rafter roof skylight. On each side start at the bottom and work up.

Since the rough opening of a 2 skylight is 22 1 2 and the rafters are on 16 centers or 14 1 2 apart we need to do some home improvement renovating. To work safely on a roof install roof brackets and a staging plank and wear a fall protection safety harness. Fixed skylights are the most popular choice and price upwards of 150 for the unit. In this video this old house general contractor tom silva installs a new skylight into an existing roof opening.

Try to use an existing rafter for one side of the rough opening. Drive roofing or flashing nails horizontally into the skylight not vertically into the roof.