Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 10-02-2014, 22:41   #1
Registered User

Join Date: Oct 2013
Location: Salish Sea
Boat: Tayana 37
Posts: 266
need for heat insulation behind a dickinson newport?

I am considering installing some Hardie concrete backerboard to provide extra insulation behind my stainless liner, but not sure it's necessary.

The heater will sit about 2.25" from a bulkhead with the stainless liner between. From all the photos of installed Dickinsons I have seen (and can see what's behind the liner) not many have extra insulation. And I had no problem not having extra insulation on the bulkhead-mounted Refleks diesel heater I installed on my last boat.

The backerboard is heavy and hard to work with. Is it overkill?
foojin is offline   Reply With Quote
Old 11-02-2014, 06:13   #2
Registered User
 
Strait Shooter's Avatar

Join Date: Aug 2010
Location: Straits of Juan De Fuca
Boat: Orca 38
Posts: 820
Re: need for heat insulation behind a dickinson newport?

I used the backer board as well. Yes, it's probably overkill, but it gives you some options in regards to what you can use over that, i.e. tile etc.
I also don't think of overkill and hot things on my boat as a bad thing.
__________________
"Waste your money and you’re only out of money, but waste your time and you’ve lost a part of your life.” (Michael Leboeuf)
Strait Shooter is offline   Reply With Quote
Old 11-02-2014, 06:30   #3
Registered User

Join Date: Oct 2010
Location: Duluth, MN
Boat: Morgan 383
Posts: 129
Re: need for heat insulation behind a dickinson newport?

I agree with SS's comments. We mounted our with the concrete board covered with ceramic tile. I put teak trim around both (like a picture frame) to cover the raw edges. It was easy.

I note that you have a SST liner. Good idea, as it will reflect heat; that helps with heat distribution and keeps the substrate cooler. It does NOT insulate BTW.
Dale Hedtke is offline   Reply With Quote
Old 11-02-2014, 06:36   #4
Registered User
 
psneeld's Avatar

Join Date: Oct 2010
Location: Avalon, NJ
Boat: Albin 40 double cabin Trawler
Posts: 1,886
Re: need for heat insulation behind a dickinson newport?

The Hardie backerboard I used was the thin stuff and easy to work with and cut.

....often the stainless shields depend on airflow between them to be effective...make sure the backerboard isn't effecting that.
psneeld is offline   Reply With Quote
Old 11-02-2014, 07:30   #5
Registered User
 
LakeSuperior's Avatar

Join Date: Jan 2008
Boat: Teak Yawl, 37'
Posts: 3,009
Images: 7
Re: need for heat insulation behind a dickinson newport?

Quote:
Originally Posted by Dale Hedtke View Post
I note that you have a SST liner. Good idea, as it will reflect heat; that helps with heat distribution and keeps the substrate cooler. It does NOT insulate BTW.
Your first sentence above contradicts your last sentence above. The metal liner, which is reflective, will act as a radiation shield and therefore insulates or retards the heat transfer through the liner.

For example, radiation shields are commonly used in cryogenic insulations and it is the reason for the foil on some of the insulations used in the building industry.
LakeSuperior is online now   Reply With Quote
Old 11-02-2014, 07:48   #6
Registered User

Join Date: Oct 2010
Location: Duluth, MN
Boat: Morgan 383
Posts: 129
Re: need for heat insulation behind a dickinson newport?

I'm sorry if my statements were confusing. My meaning is that the SST liner will reflect radiant heat, it does not insulate (reduce) conductive heat transfer.
Dale Hedtke is offline   Reply With Quote
Old 11-02-2014, 07:48   #7
Registered User
 
LakeSuperior's Avatar

Join Date: Jan 2008
Boat: Teak Yawl, 37'
Posts: 3,009
Images: 7
Re: need for heat insulation behind a dickinson newport?

The manufacturer will provide guidance on the installation of the heater. I would follow this to the letter. A change from the guidance requires an analysis of the proposed installation and in many cases the results could be counterintuitive.

For example, installing concrete board on 3/4 in plywood potentially is of little benefit in terms of actual temperature reduction on the back of the concrete board. That is the delta temperature between the front and back surfaces may be minimal. This is because the 3/4 in plywood is also insulating thus reducing the temperature drop in the backer board.
LakeSuperior is online now   Reply With Quote
Old 11-02-2014, 07:53   #8
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 51,072
Images: 241
Re: need for heat insulation behind a dickinson newport?

Dickinson specifies a 1/4" high heat insulation board with a stainless sheet on ½" standoff; and a minimum of 2" separation twixt heater and insulated wall.

Dieselhttp://dickinsonmarine.com/Manuals/D...ual-2011-2.pdf

Propanehttp://dickinsonmarine.com/Manuals/P...2%20Manual.pdf
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is online now   Reply With Quote
Old 11-02-2014, 08:00   #9
Registered User
 
LakeSuperior's Avatar

Join Date: Jan 2008
Boat: Teak Yawl, 37'
Posts: 3,009
Images: 7
Re: need for heat insulation behind a dickinson newport?

The standoff posts should be at the corners and edges farthest from the heater/standoff minimal distance. If possible use non heat conducting fasteners. A thermal short circuit is created if metal bolts are used in the standoffs.
LakeSuperior is online now   Reply With Quote
Old 11-02-2014, 11:57   #10
Registered User

Join Date: Oct 2013
Location: Salish Sea
Boat: Tayana 37
Posts: 266
Re: need for heat insulation behind a dickinson newport?

Thanks for the responses.

SS, is your backer board also the concrete version?

As Gord points out, the Dickinson manual does specify 1/4" high heat insulation board. I have called almost everywhere I can think of in the Vancouver-Bellingham-Seattle area, but not found 1/4" board.

The closest I have been able to find is the 1/2" Hardie concrete backboard which weighs a ton. Even the Sigmar/Dickinson factory in Surrey was unable to suggest a supplier. Seems to me that no one is actually expected to follow the manuals, but the small print is there to protect the firm's a$$. But maybe I'm just suspicious.

There is one product (Kaowool) made in MA that seems to the bill, made from ceramic and alumina bits, but I would have to get a whole carton shipped to the West Coast to get one small piece.

Thus my question about how others have insulated.
foojin is offline   Reply With Quote
Old 11-02-2014, 12:07   #11
Registered User

Join Date: Oct 2013
Location: Salish Sea
Boat: Tayana 37
Posts: 266
Re: need for heat insulation behind a dickinson newport?

Quote:
Originally Posted by LakeSuperior View Post
A thermal short circuit is created if metal bolts are used in the standoffs.
LS, excuse my ignorance, but are you suggesting that if I bolt the standoffs to the liner, as well as to the wall, instead of welding, say, that this will short circuit or limit the amount of heat that flows through the standoff?

If so, would this effect be increased by adding washers to the connection, or using aluminum standoffs instead of stainless?
foojin is offline   Reply With Quote
Old 11-02-2014, 12:18   #12
Registered User
 
LakeSuperior's Avatar

Join Date: Jan 2008
Boat: Teak Yawl, 37'
Posts: 3,009
Images: 7
Re: need for heat insulation behind a dickinson newport?

Quote:
Originally Posted by foojin View Post
LS, excuse my ignorance, but are you suggesting that if I bolt the standoffs to the liner, as well as to the wall, instead of welding, say, that this will short circuit or limit the amount of heat that flows through the standoff?

If so, would this effect be increased by adding washers to the connection, or using aluminum standoffs instead of stainless?
If we are talking about the same thing, a stand-off panel, then to make the panel stand off the liner (effect an air gap between the liner and panel)
one would want use posts and fasteners that do not conduct heat.

So if you used a heat conductive or metal carriage bolt to hold everything up you could end up with hot spots on the liner. This is because the metal bolts would get hot and conduct the heat to the liner.

Aluminum conducts heat better than stainless. Only marginal benefit if the washers are steel (or any other material) because the bolt head would still be a source for heat flowing down the bolt.
LakeSuperior is online now   Reply With Quote
Old 11-02-2014, 12:51   #13
Registered User

Join Date: Oct 2013
Location: Salish Sea
Boat: Tayana 37
Posts: 266
Re: need for heat insulation behind a dickinson newport?

Quote:
Originally Posted by LakeSuperior View Post
If we are talking about the same thing, a stand-off panel, then to make the panel stand off the liner (effect an air gap between the liner and panel) one would want use posts and fasteners that do not conduct heat.

So if you used a heat conductive or metal carriage bolt to hold everything up you could end up with hot spots on the liner. This is because the metal bolts would get hot and conduct the heat to the liner.

Aluminum conducts heat better than stainless. Only marginal benefit if the washers are steel (or any other material) because the bolt head would still be a source for heat flowing down the bolt.
Ok, we were probably not talking about the same thing. I was referring to a liner/panel that is both connected to the heater and to the bulkhead. I seem to have misunderstood, and you were actually suggesting that using bolts increases rather than decreases the heat transfer.

And quick googling after my last post showed, as you suggest, aluminum is a better heat conductor than stainless. It is surprising in that Dickinson provides aluminum mounting bars for the heater.
foojin is offline   Reply With Quote
Old 11-02-2014, 15:42   #14
Registered User
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,619
Re: need for heat insulation behind a dickinson newport?

Quote:
Originally Posted by GordMay View Post
Dickinson specifies a 1/4" high heat insulation board with a stainless sheet on ½" standoff; and a minimum of 2" separation twixt heater and insulated wall.

Diesel ➥ http://dickinsonmarine.com/Manuals/D...ual-2011-2.pdf

Propanehttp://dickinsonmarine.com/Manuals/P...2%20Manual.pdf
This was our Dickinson Diesel heater. The backer is fireproof board, covered with a SS sheet and in a teak frame, mounted with 1/2 inch stand offs at the corners and center edges. we used this extensively for years.

Click image for larger version

Name:	<a title=Cabin Heater.jpg Views: 433 Size: 44.7 KB ID: 75820" style="margin: 2px" />
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 11-02-2014, 16:06   #15
Registered User
 
cburger's Avatar

Join Date: May 2006
Location: Nyack, NY
Boat: Westsail 32
Posts: 1,697
Images: 1
Re: need for heat insulation behind a dickinson newport?

1/2" marine ply cover with home depot white tile, framed in teak
Attached Thumbnails
Click image for larger version

Name:	Plywood for heat shield.jpg
Views:	226
Size:	410.8 KB
ID:	75830   Click image for larger version

Name:	PA310003.jpg
Views:	405
Size:	395.9 KB
ID:	75831  

Click image for larger version

Name:	P9270063.jpg
Views:	2691
Size:	401.2 KB
ID:	75832  
__________________
"All men are created equal, some just more than
others" KD2RLY
cburger is offline   Reply With Quote
Reply

Tags
dickinson, insulation, newport

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Advertise Here


All times are GMT -7. The time now is 05:31.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.