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  1. #1
    Join Date
    Apr 2008
    Location
    N. Eastern Wisconsin
    Posts
    26

    Question Installing roof vent

    Hi all,
    I submitted this in the "Roofing" section, I want to post it here too.
    A couple years back I bought a vent to install on our garage roof as it gets quite hot in there during the summer. The vent has like a 10" hole in it. The garage is 24'x 24'. The roof has a center peak and slopes on all 4 sides.
    Which side do I want to put this on? Which way should the opening face ? How far down from the peak ? Does common wind direction matter ?

    Rich Kelly

  2. #2
    Join Date
    Aug 2007
    Posts
    443

    Default Re: Installing roof vent

    Some of these sites deal with hip roof venting---you can use the vent you have & maybe incorporate into one of the systems below.

    Also Google "hip vent installation instructions", "hip roof ridge vents", "hip roof venting dilemna", "mid america components"

    http://www.trimline-products.com/div...0C2D6?Open&Pro
    http://en.allexperts.com/q/Roofing-1598/index_all.htm
    http://www.miltyr.se/roofing_ridge_master.html
    http://www.tapcoeurope.com/ridgevents.htm
    http://en.allexperts.com/q/Roofing-1...ge-Vents-1.htm
    http://en.allexperts.com/q/Roofing-1...idge-Vents.htm
    Last edited by JacktheShack; 08-12-2008 at 11:59 PM.

  3. #3
    Join Date
    Apr 2008
    Location
    N. Eastern Wisconsin
    Posts
    26

    Default Re: Installing roof vent

    jts, I didn't plan on the expense and time to install ridge vents. Altho, it might be an option. this is simply a galvanized square dome, or hood, with a 10" pipe rivited to the inside of it. Then there is a flat plate on the bottom to nail it down under the shingles.

    Rich Kelly

  4. #4
    Join Date
    Aug 2007
    Posts
    443

    Default Re: Installing roof vent

    These vents are known as roof cans and are recommended for hip roofs---they are installed on any one of the sides near the middle top of the roof, 2 to 3' down from the ridge, but preferably the side with the prevailing winds---usually north---some venting at the lower side of the roof is needed to create an air flow for these vents to be effective.

    On the inside of the garage, drill a small hole between the exact center of two center rafters about 2' down from the ridge, & stick a nail thru so you can locate the hole on the exterior side.

    Check the condition of the shingles before you go on the roof, wear gym shoes---if the shingles are old & brittle walk very carefully---if the shingles are cupped & will break if you walk on them, use a ladder with attached 2 X 3's on the bottom that will rest between the cupped tabs---it is very difficult to get a color match between old & new shingles if the ones on there now are damaged.

    Leave the ridge shingles & top layer of shingles in place & remove a few shingles immediately around the nail hole---use a wide putty knife to loosen the sealed-down shingle flap/tabs & a small crow bar to creep under the shingles & loosen the roofing nails so you can remove the shingles without tearing or damage---if the shingles can be bent up without breaking, this job is a lot easier, both for removing the nails, & replacing them---discard the tar paper/building paper under the shingles.

    Cut a hole in the plywood/wood sheathing using the previously drilled hole as the center point to match the size of the new vent's hole---smear the bottom of the metal flange that will face the top of the roof with roofing cement & slip this flange of the vent under the upper layer of shingles & push it upwards--- hammer a few nails only in the top and side metal flange---do not put any nails in the bottom flange, which is to remain exposed over its bottom row of shingles---use wide head galvanized roofing nails.

    Not sure which way the open side of the vent should face---usually down, there is usually an arrow that indicates proper direction---there are often internal baffles that prevent snow from blowing in.

    It can be checked out if you can post the mfgr's name & model #.

    Cut & replace the removed shingles around the sides,top & bottom of the vent flanges as needed to neatly match the shingle rows & cover the vent flange, except on the bottom, carefully bending the upper row to slip the shingles underneath--sometimes a few inches has to be cut off the top of the shingle you are trying to slip under so it will go in & neatly match the row---if you can get some nails into the shingles without damaging them, do so.

    Use black roofing cement to seal the shingles & any exposed nail heads & nail holes to prevent leaks.
    Last edited by JacktheShack; 08-14-2008 at 06:34 PM.

  5. #5
    Join Date
    Aug 2007
    Posts
    1,131

    Default Re: Installing roof vent

    Scanned the thread and didn't see this mentioned -

    You'll also need intake/soffit vents.

  6. #6
    Join Date
    Apr 2008
    Location
    N. Eastern Wisconsin
    Posts
    26

    Default Re: Installing roof vent

    JtS, thanks for the detailed explaination. Will make it easier going in. Good thing I asked, I never considered using roofing cement. Thought the shingles would suffice.
    ****hiller, the soffits are all vented. I also have a window going out to an enclosed screened patio that stays open through the summer.

  7. #7
    Join Date
    Aug 2007
    Posts
    1,131

    Default Re: Installing roof vent

    Good deal. Then you're set for intake. Thumbs up.

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