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Cor-a-vent below or inbetween furring?

SouthDakotaRoof | Posted in General Questions on

I have cor-a-vent sv5 siding vent purchased as my bug screen. I see their instructions are to place it below and above the 1×4 furring strips. But I see online people often cut it to go between the furring. I assume cor-a-vent prefers the option that requires me to buy more of their product to maximize their $ making. Anyone have a opinion about me doing it the cut & patch in way so that I can save myself from possibly buying more? Any opinions, thoughts or experiences are welcome. Thank you.

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  1. charlie_sullivan | | #1

    Critters are a nuisance. Continuous seems like it will leave fewer potential entry points. And it's less labor. So I'm siding with c0r-a-vent on this one, but I expect someone will show up soon with an opposing view.

  2. Expert Member
    Michael Maines | | #2

    For siding I have only used Coravent between vertical wood battens. They are fast and easy to install. 1/8" tolerance is close enough and easy to do.

  3. JC72 | | #3

    Too many cuts are required to place it between the furring strips. Why risk having to throw away product because it's miscut?

  4. woobagoobaa | | #4

    We did as Charlie suggested. Continuous all the way around. Side shot of the install. 1/4" siding gap with PVC skirt required to keep water from pooling on a wide stone foundation.

    1. maine_tyler | | #5

      Wooba, I like that detail: I've got something vaguely similar planned.

      But what forms your vent path? It looks like the top PVC board cuts off the path. Or wait, does the board only go to the battens, so there is still that gap? If that's the case, how are you blocking off that gap for bug intrusion?

      1. woobagoobaa | | #6

        The top of the PVC skirt sits against the outer edge of the batten. Claps (not yet installed) nailed through the battens will overlap the skirt. Bottom of cor-a-vent has built-in bug screen.

        Approx 1/3 of the sill had to be replaced due to bugs / moisture, etc. Foundation and sills will be blasted with Bora-care. All vegetation pulled back a few feet from foundation, gravel perimeter going in.

        1. maine_tyler | | #7

          Makes sense. Now that you say it, I'm not really sure what I was thinking—somehow I was picturing a gap between the siding and the PVC.

  5. verygood | | #8

    We spent some time doing a few buildings with both approaches and ended up using the continuous cor-a-vent below the battens. A few reasons, one is that it does cost a bit more in material, but we found it was offset and then some by the labor. It also leaves less room for critters, etc. Mostly we found that if we use 5/8" battens and 3/4" cor-a-vent we can simply start our siding course without having to furr out or use a starter course. It gives it a perfectly natural starting point. This also results in less material and labor. See pic

    1. woobagoobaa | | #9

      What WRB are you using there Joshua?

      1. verygood | | #10

        It's the SIGA SA 500. It's a self adhered membrane.

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