[Greenbuilding] roof venting

[J Daglish]

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>:

> 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_Ul
> travic_Install_Guide.pdf
> Here's a simple video of a guy putting the Rafter Vents up:
> https://www.youtube.com/watch?v=5DX25Vz2jDc
>
> Frank Tettemer
> Living Sol ~ Building and Design
> www.livingsol.com
> 613 585 3661
>
>
> 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>
>> 373 route 203
>> Spencertown, NY 12165
>> USA
>> 518-392-4640
>> colsen at taconic.net
>>
>>
>>
>>
>>
>>
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