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Shed Roof Ventilation

| Posted in General Discussion on April 9, 2001 04:20am

*
We are enclosing a former porch and using the shed roof’s pitch to create a
>vaulted ceiling that will be finished with drywall, insulation
>and a foam spacer to keep the insulation from blocking the air flow underneath
>the roof sheathing. I want to vent the shed roof of this former porch where
>the top of the roof meets the vertical wall of the main part of the house. Is
>there a product available, such as a “half ridge vent” that will allow air to
>flow unimpeded from the soffit up and out the top of the shed roof between
>each rafter?
>
>Thanks, Dan

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Replies

  1. Jeff_J._Buck | Apr 07, 2001 09:27am | #1

    *
    Just take a regular ridge vent....any of the hard plastic type....and cut it in half with a ulility knife. Each 4' section makes for two pieces to cover 8'. Run the shingles up as usual,cover with the vent and run the flashing on top, bent into the kerf and extend it to with in 1/2 inch the edge of the vent. I like an additional bend down(very slight, but enough to hold tight)about 3/4" from the edge. I prefer vents with a built in baffle, and some screening. Get color coordinated flashing and it hides itself. Jeff

    1. Mike_Guertin | Apr 07, 2001 12:20pm | #2

      *Dan,There's a product made just for the application. It's called a Flash Filtervent FFV162. It does double duty in fact. It forms the flashing transition between the wall and the top edge of the shed roof. You can either slip the wall flange beneath existing siding or strip back a course to get it tight to the wall sheathing then detail the housewrap/building paper over it. The roof flange sits atop the roof material.All you need to do is cut a 1" slot in the roof sheathing right at the meeting point between roof and wall. The Flash Filtervent bridges the space and has a kickout louver about 2 or 3" up the wall section that provides ventilation.Now where to get it locally is the trick. I'm in the NorthEast where a regional supplier (Harvey Industries) special orders it by the carton for me[4 pcs to box, 8' long each. Comes in Black, Brown, Bronze, Grey and copper]. I typically order a box and hang on to the extra - always gets used up.It adjusts from a 3 pitch to a 12 pitch and has 9 sq in of net free vent area per lin foot.Harvey has outlets from PA to ME. HQ 800-225-5724 http://www.harveyind.com may have info on product under ventilation section - I haven't checked.You may ask local building material suppliers to you too.It fit's the application like a champ.Mike

      1. Ron_Rosa | Apr 09, 2001 03:12am | #3

        *ABC Supply, Arzee Supply, National building supply, Allied , Bradco to name a few of the places to get it.

        1. Jeff_J._Buck | Apr 09, 2001 04:04am | #4

          *That's the stuff I started look for before using the vent in half idea. No one local could help.....I'll have to try again with the name of the stuff.....that usually works better! Jeff

          1. Ron_Rosa | Apr 09, 2001 04:10am | #5

            *I just ask for wall vent. There is also a soffit vent edging out there not used to often, it gets put on like a normal drip edge at the bottom but it flares out a little with bottom of flare perforated . All you have to do is cut the top edge of facia down before installing. It works great when installing new roof on old home that does not have soffit vents.

          2. Gene_Leger_ | Apr 09, 2001 04:20pm | #6

            *Dan. Venting a shed roof that ties inot a vertical wall is iffy at best. If the shed roof is on the windward side, the vnet will be subjected to wind driven rain/snow penetration. Even the flash vent is troublesome because it is usually not correctly installed. GeneL. Better to fill the rafter bays with insulation. Next attach rigid foam board insulation (RFBI)to the rafters (tape all seams and buts), and finish off with gypsum wall board (GWB). This make venting the roof unnecessary. GeneL

  2. Dan_Thornton | Apr 09, 2001 04:20pm | #7

    *
    We are enclosing a former porch and using the shed roof's pitch to create a
    >vaulted ceiling that will be finished with drywall, insulation
    >and a foam spacer to keep the insulation from blocking the air flow underneath
    >the roof sheathing. I want to vent the shed roof of this former porch where
    >the top of the roof meets the vertical wall of the main part of the house. Is
    >there a product available, such as a "half ridge vent" that will allow air to
    >flow unimpeded from the soffit up and out the top of the shed roof between
    >each rafter?
    >
    >Thanks, Dan

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