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Posted by marson on October 28, 2006, 9:41 pm
google "windwash barrier"
Jonny wrote:
> >I posted this once before using FreeAgent, but it never showed up. I
> > even went to Google groups and searched there without finding it, so
> > it apparently just evaporated. I'm therefore trying again and hope it
> > does not result in double posting:
> >
> > Post
> > ----------
> > A flat roof covering an addition to my house had to be completely
> > re-done from the walls up--new rafters, decking, roof. I had it
> > framed, decked, and re-roofed by a roofer, but I must finish the
> > inside.
> >
> > Maybe if I can describe this properly, no photo will be necessary:
> > The rafters run from the inside wall and rest upon (and extend beyond)
> > the outside wall. There is plywood decking with rubber roof on top. No
> > soffit yet. So it is completely open between the rafters from the
> > soffit area, above the walls, to the inside. I will insulate the
> > inside room area between the rafters. I will have vinyl soffit and
> > facia applied later, and the soffit, will, natrually, be vented.
> >
> > The question is how should the insulation be separated from and
> > protected from the soffit area which will be vented to the outside?
> >
> > Seems to me that I should nail up some planking or staple up some
> > plastic (at the walls between the rafters) to protect the insulation
> > from the outside air.
> >
>
> This is called "birdblocking" where I've been. Its the same size lumber as
> the rafters. A hole make be cut and blocked with heavy galvanized screening
> for air flow. If you go this route you don't need a soffit.
>
> > Or, should this be left open for ventilation purposes?
>
> Up to you.
> >
> > JFM
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