OK, Ron and Bill, you can say I told you so!
Jamie and Travis,
Due to my work schedule and ability to procrastinate, I have not written
the white paper I need to publish on this very topic.
We had a cold snap in the Seattle area a few years ago and we had MANY
freezes of the sidewalls that were placed in the wall in a very common
practice - fed overhead down through the top plates into a 6" wall with
the insulation on the outside of the pipes and the steel barrel poking
out into the walkway, etc.
Engineering calculations with a finite element program plus a full scale
test with a cold chamber proved that the heat transfer down the steel
barrel of a sidewall sprink would cause freezing of the water at the
junction of the tee in the wall, caulked, sealed and insulated. While
it might not break the tee, especially if it was steel, it still froze,
damaged the seal or was certainly below the magic 40F listed in 13. It
was our conclusion that the construction practice could not meet the
requirements of 13 in the mild Seattle area.
We then looked at the manufacturer's recommendations and none of them
had any at the time - no required exposed barrel length in the heated
area vs. the exposed temperature and amount of insulation. And what
temperature do you assume for the heated area? 70? 55 for a winter
turndown? A real problem!
As much as I REALLY hate to say it, think dry.
Michael M. Fitz, P.E., C.F.E.I., C.F.P.S.
MDE Inc. 700 S. Industrial Way, Seattle, WA 98101
Home Office P.O. Box G, Shelton, WA 98584
206-321-1804
On 2/21/2011 3:03 PM, Jamie.seidl wrote:
We've always concealed them in a soffit or perpendicular wall. As long as the
insulation is at the exterior wall you'll be fine. Not really sure where he is
coming from with that. You are still within the heated envelope of the
building.
Jamie
Sent from my iPhone
On Feb 21, 2011, at 5:53 PM, "Travis Mack, SET"<[email protected]> wrote:
How is everyone installing these heads when req'd? One of my customers just left a
meeting with the Tyco Rep and he was told that you were required to have x" of dry
barrel exposed (depending on temperatures) in the room, and that it could not be
concealed in a soffit or decoshield. We can't see some of these high end apts or condos
allowing 4-6" of exposed dry barrel in a unit. What are others in cold climates
doing with these situations?
--
Please feel free to call if you have any questions or comments.
Sincerely,
Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
Office (480) 505-9271
Fax (866) 430-6107
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