Non-Ridge Vents

This document covers the basics of installing a non-ridge vent at the mounting plane to allow for adequate venting when the length of the ridge is broken up into short spans. Other use case examples are using it for a vent at headwalls or an intake vent near the eave when no soffit vent is present. The Deck Level Flashing for the non-ridge vent will provide a maximum of 66 SQIN NFA.

This procedure requires some layout before dry in, with the rest of the steps occurring during dry in and tile installation.

Tools and Equipment:
  • Utility knife
  • Marker
  • Cordless circular saw
  • Cordless impact driver drill
  • Cordless roofing nailer
Components:
  • Self-Adhered Underlayment Class A, 1613738-03-A or (if permitted) Class C 1751844-00-A
  • Flashing, Deck, Vent, 1606873-00-A
  • Tile Vent Part number: 1840821-01-F
PPE:
  • Safety glasses
  • Cut resistant gloves
  • Fall protection

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Note
It is important to reference the construction drawings and venting calculations to ensure an accurate ratio of venting and proper vent placement.
  1. Start by laying out the approximate location of the vent(s). The construction drawings will show which courses of tile vents need to be installed. Multiply the course number by 14 (Example: vents on the 5th course from the eave, 5x14 = 70). Then, measure from the eave up to your vent location and mark the location on the roof deck.
  2. Next, install the underlayment on the roof surface.
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    Note
    Important: When installing the first course of underlayment up-roof from your tile vent course, leave the backer sheet on the lower half of the underlayment unpeeled. This will allow you to properly integrate your deck level vents into the underlayment.
  3. Install the tiles up to the course just below your tile vent course. This will allow you to accurately place the deck level vent where the tile level vent can be installed directly above it. Position your deck level vent centered on the water channel of the course below.
    1. Use a marker to mark your cut location on the deck.
  4. Make sure to set the depth of the circular saw correctly so nothing besides the decking gets cut. There should be no damage to the rafters/trusses. Use the circular saw to cut the decking on your marks. Remove the cut decking and clean any debris. Install the flashing with nail spacing as shown.

    Informational PurposesAn informational icon, calling your attention
    Note
    Do not place fasteners below the vent flange.
  5. Cut a piece of underlayment at least 36 in long so that the vertical edges of the deck level vent flashing have at least 6 in of underlayment coverage. Cut the underlayment to the proper height, allowing the up-roof edge to be tucked 3 in underneath the course of underlayment above and to cover the deck level vent.
    1. Install the underlayment.
  6. Install the tile level vent flashing similar to a standard metal tile. Use the alignment marks to ensure proper spacing of water channels.