[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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