Re: Wine Cellar Insulation & Vapor Barrier

Ken:

Sounds all right.

No, Tyvek is permiable, more or less one way. Even with the siding,
OSB and Tyvek, the wall can dry out from the outside. The objective of
Tyvek is to let water vapor out but not in. You're good.

Re-reading your original post, the outside facing fsk is not
continous, but 'draped' in the bays. The studs have opporutunity to
breath. Ok here.

The interior facing fsk is sealed, or taped up along the studs,
between bats to be a continous vapor barrier for the room vs. your
question of using 6mil poly draped in the bays prior to installing the
insulation. Either technique serves the same goal, to keep outside
water vapor from entering the living space.

I think your cool Ken. I would not press for the 6mil and let it go
with the fsk as is.

2 things. You want the wall to be able to dry out sometime so the
studding must have acess to the outside. You're good here. And, you
want to keep any outside water vapor from entering your living space.
You're good here too.

Does that make sense?

steve noobie
Oregon





On 24 Aug 2006 02:03:53 -0700, koberry@xxxxxxxxx wrote:

Steve:

Thanks for the reply. The exterior basement wall that I'm concerned
about has 2x6 studs sheathed with OSB and I'd have to bet that there's
Tyvek wrap between the OSB and fiber cement siding.

Your reply gives me concern in that everything I've read online at
sites for wine racking & cellar construction indicate that the wall
needs a contiguous vapor barrier of 6 mil poly. If I can't wrap the
studs from the exterior, what I've read directs me to loosely drape the
stud bays with the 6 mil and then place the fiberglass batting in the
bays. Wondering if the combination of Tyvek on one side and 6 mil poly
on the other could result in the rot condition you mention?

I'm not sure what to do about this...

Ken


spud wrote:
Hey:

It sounds ok to me if I'm reading you right.

If the studs are completely encased in vapor barriers applied on both
the interior and exterior wall I would think they'd rot right before
your eyes.

However,it sounds like both vapor barriers ( insulation foil and fsk?)
are applied from the inside of the structure. The studs are not
covered on the exterior side with a vapor barrier and free to breath.
Right? That's good.

We use Tyvek here on the outside of the wall which is a more or less
one way vapor barrier, allows the wall to shed moisture, tries not to
let it back in.

Not sure if fsk is one-way vapor barrier or non permiable, but if the
studs are not covered up on the exterior, I'm not sure it matters.
Not a contractor so take it with a grain o' salt.


Take Care,
Steve noobie
Oregon





On 22 Aug 2006 04:25:37 -0700, koberry@xxxxxxxxx wrote:



You want to keep moisture out of the insulation and it usually gets
there from the living space, the heated side. I don't like fiberglass
insulation in a cellar here, I used high density Styrofoam board
instead. If it gets wet it won't rot. If this contractor has a good
reason to do this, I just don't follow it. Maybe they are trying to
channel moisture from the outside wall to the floor, but you have to
get rid of it too. I'm in Pittsburgh, we just assume any basement wall
will leak eventually, everything cracks at some point. We do interior
and exterior french drains now because of that.

Joe
koberry@xxxxxxxxx wrote:
Hi:

I'm having my wine cellar built now and the insulation contractor has
used 'FSK' foil-backed insulation in all stud bays. On the
interior-facing walls, the foil is on the outside of the studs with
foil tape ensuring that there's a seal. On the exterior facing wall,
they put the FSK foil into the stud bay and then placed fiberglass
batts into the bay. The FSK in the exterior facing wall is loose and
not contiguous from bay to bay. I've read that 6 mil poly vapor barrier
should be left loose in the bays running contigouously along the length
of the wall, with the batts placed in the stud bays after the vapor
barrier.

Should the insulation contractor remove the FSK on the exterior-facing
walls and put up a 6 mil vapor barrier? If so, thould the poly replace
the FSK foil, or be used in addition to the FSK?

Thanks,

Ken

.

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