[Greenbuilding] roof venting

Frank Tettemer frank at livingsol.com
Sun Jan 22 16:55:53 CST 2017


Good Eye, John.  The guy was doing it wrong. Likely, he was never a roofer.
Frank


On 22/01/2017 5:47 AM, J Daglish wrote:
> Attention the overlaps of  Mr Hardware.
>
> The top unit should overlap on top of the next unit down.
>
> Otherwise if there is any condensation it will run into the insulation.
>
> Regards
>
> John Daglish
>
>
> John Daglish
> Paris, France
>
> 2017-01-22 0:24 GMT+01:00 Frank Tettemer <frank at livingsol.com 
> <mailto:frank at livingsol.com>>:
>
>     Hey Clarke, Here in Ontario there has been a cheap (but plastic!)
>     product developped a decade back. It's a skimpy sheet of styro,
>     like an egg carton thick, and factory-molded like an egg carton,
>     to form a pair of ventilation throughways. These things get
>     stapled to the underside of the roof, between rafters or joists,
>     with the first one's "drip-line" outside in the soffit area. Each
>     one staplled up is "shingled" in such a way that any mpisture
>     above the styro, eventually drips out the un-insulated but Vented!
>     soffit area.
>     At the peak of the roof, VicWest makes a fantastic metal box-like
>     vented roof ridge, that carries ventilation from the soffit
>     through and out the ridge.
>     Styro rafter vents are called Moore Vents in this area, cover
>     about 22" x 32" area, cost about a buck each.
>     Put up batts, or blown in cellulose, those plastic vents do it.
>
>     ( Aside: Twenty years ago, addressing this same concern for
>     condensation, I made up a batch of "Moore Vents" out of scrap wood
>     and card board.
>     Laborious. But no problems with it over it's life so far.
>     I pay the dollar for the store-bought ones now, gladly.)
>
>     Here's a picture of the VicWest Vented Ridge, on page two, very
>     bottom left corner:
>     http://www.vicwest.com/sites/default/files/Res_SR_SnapRib_Ultravic_Install_Guide.pdf
>     <http://www.vicwest.com/sites/default/files/Res_SR_SnapRib_Ultravic_Install_Guide.pdf>
>     Here's a simple video of a guy putting the Rafter Vents up:
>     https://www.youtube.com/watch?v=5DX25Vz2jDc
>     <https://www.youtube.com/watch?v=5DX25Vz2jDc>
>
>     Frank Tettemer
>     Living Sol ~ Building and Design
>     www.livingsol.com <http://www.livingsol.com>
>     613 585 3661 <tel:613%20585%203661>
>
>
>     On 21/01/2017 1:02 PM, Clarke Olsen wrote:
>
>         I am building a 750 sqft building with two single plane (shed)
>         roofs, using 12" I joists @ 3/12 pitch.
>         Can we just stuff that 12" with Roxul, or is ventilation needed?
>         Clarke Olsen
>         clarkeolsendesign.com <http://clarkeolsendesign.com>
>         <http://clarkeolsendesign.com>
>         373 route 203
>         Spencertown, NY 12165
>         USA
>         518-392-4640 <tel:518-392-4640>
>         colsen at taconic.net <mailto:colsen at taconic.net>
>
>
>
>
>
>
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-- 
Frank Tettemer
Living Sol ~ Building and Design
www.livingsol.com
613 585 3661





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