Possible alternative to Reflectix? - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 22 Old 05-12-2012 Thread Starter
Senior Member
 
Join Date: Mar 2012
Location: Vancouver, BC
Posts: 377
Thanks: 4
Thanked 5 Times in 4 Posts
Rep Power: 4
 
Possible alternative to Reflectix?

Space is at a real premium in my boat(Alberg 30) but I am trying to insulate the V-berth. Funds are a bit tricky too, and I came across an article talking about attic insulation, and the lack of benefit vs expense of the bubble wrap/fiber fill reflective vapor barriers.
I found a single sided reflective barrier for a good price, double sided for not much more. 110 and 128$ for a 4'x250' roll. (vs 142$ for a 50' roll of reflectix)
The article also talked about the lack of radiant benefit unless there was an air space on one side of the foil, but on the hull side it would be more about the vapor barrier I think?
This plus 3/8" or a 1/2" of Volara closed celled foam sandwiched in between two layers like on frugal mariner would take up little space, and might give me a decent boost in condensation avoidance, and heat retention.
I could then do the fiberglass panel, and/or a mahogany ceiling.
Attic Foil Radiant Barrier - 48" Wide Radiant Barrier Foil - Solid/Vapor Barrier

Foam Insulation, Padding, Closed-Cell Foam - Volara
Jgbrown is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 22 Old 05-12-2012
Senior Cruiser
 
sea_hunter's Avatar
 
Join Date: Jul 2000
Posts: 512
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 16
 
When I redid our coach house paneling I glued a layer (1/4") of foundation insulation/vapor barrier between the teak paneling and FG. $60 for a bundle from Home Depot.
sea_hunter is offline  
Quote Quick Reply Share with Facebook
post #3 of 22 Old 05-12-2012
Owl
 
-OvO-'s Avatar
 
Join Date: Dec 2011
Posts: 219
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 4
 
Re: Possible alternative to Reflectix?

I've gone down this road a few times myself and concluded that the bubble wrap is only useful under some very carefully constrained conditions. what you want is either the closed-cell foam (cheap) or aerogel (def not).
-OvO- is offline  
Quote Quick Reply Share with Facebook
post #4 of 22 Old 05-12-2012
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,500
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
Re: Possible alternative to Reflectix?

This link might be interesting Capt'n Pauley's Virtual Boat Yard -- Projects Galore!!!: Installing Insulation in Your Boat

I am insulating with both Reflectix and closed cell foam. In the V-berth my boat has vertical beams glassed in that are 1" thick. I am using a layer of Reflectix, a layer of 1/2" closed cell foam and another layer of Reflectix. The V-berth is probably the most important area as when sleeping you have a lot more body heat close to the hull than in other parts of the boat which often have lockers between where you sit and the hull.
I don't think Reflectix is that effective by itself but it would help on the inside of a cabin top that is balsa cored.

As described on the Frugal Mariner site there are 3 types of heat loss and one type of insulation can't eliminate all 3.

I have a neighbor with a Spencer 35 that is insulated with 1/2" closed cell foam - it was done over 20 years ago - and it is one of the warmest boats I have been on in cold weather. The boat was built in the 60's and other than the 1/2" foam the only insulation is a thick hull.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #5 of 22 Old 05-12-2012 Thread Starter
Senior Member
 
Join Date: Mar 2012
Location: Vancouver, BC
Posts: 377
Thanks: 4
Thanked 5 Times in 4 Posts
Rep Power: 4
 
Re: Possible alternative to Reflectix?

This would be the same triple layer, the volara is closed cell foam. The only difference is bubbles in the reflective barrier, eliminating those since they aren't as effective as the closed cell foam and having the vapor barrier/reflective layer without them, more room and money for foam, or slightly thinner overall after all three layers
Jgbrown is offline  
Quote Quick Reply Share with Facebook
post #6 of 22 Old 05-12-2012
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,500
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
Re: Possible alternative to Reflectix?

The attic radiant barrier foil is not much less expensive than Reflectix. And there are places on the boat that may not have the available room for the Volara - in these places Reflectix can be used by itself.

I have used Ethafoam which is closed cell and similar to Volara in price.

The air space is needed in conjunction with the foil barrier to create a radiant barrier.

From the attic foil link:
Attached Thumbnails
1.jpg  

Brian
Living aboard in Victoria Harbour

Last edited by mitiempo; 05-12-2012 at 01:21 PM.
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #7 of 22 Old 05-12-2012
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,500
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
Re: Possible alternative to Reflectix?

I just checked Home Depot and Reflectix is $142 for a 48" x 50' roll! I have a roll this size that I bought last year for about half this amount.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #8 of 22 Old 06-10-2012 Thread Starter
Senior Member
 
Join Date: Mar 2012
Location: Vancouver, BC
Posts: 377
Thanks: 4
Thanked 5 Times in 4 Posts
Rep Power: 4
 
Re: Possible alternative to Reflectix?

Quote:
Originally Posted by mitiempo View Post
The attic radiant barrier foil is not much less expensive than Reflectix. And there are places on the boat that may not have the available room for the Volara - in these places Reflectix can be used by itself.

I have used Ethafoam which is closed cell and similar to Volara in price.

The air space is needed in conjunction with the foil barrier to create a radiant barrier.

From the attic foil link:
Then what good is reflectix, when people are putting it behind closed celled foam it is basically only a vapor barrier at that point? I agree for the places where spacing is hard, but for the most part, it seems like they were saying on frugal mariner that it was ok to have it touch the surfaces of reflectix(same as attic liner?)
Jgbrown is offline  
Quote Quick Reply Share with Facebook
post #9 of 22 Old 06-10-2012
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,500
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
Re: Possible alternative to Reflectix?

Jeremy

From the Frugal Mariner:
Attached Thumbnails
1.jpg  

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #10 of 22 Old 06-10-2012 Thread Starter
Senior Member
 
Join Date: Mar 2012
Location: Vancouver, BC
Posts: 377
Thanks: 4
Thanked 5 Times in 4 Posts
Rep Power: 4
 
Re: Possible alternative to Reflectix?

I remember that. What I don't get is where the difference is. They are both doing the same thing, one with bubble wrap, one with closed celled foam. If it doesn't work touching hull or foam without bubble wrap, why would it work any better with bubble wrap?
If reflective materials only work with air gap, the frugal mariner version doesn't work? If they work without it, then closed celled foam(skipping the bubble wrap) makes more sense anyways since it has a better R value. Or am I missing some extra property of reflectix?
Jgbrown is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Insulation: Reflectix or Sheet Styrofoam coreywoodworking Cruising & Liveaboard Forum 12 01-15-2011 01:20 PM
Alternative material merttan Gear & Maintenance 5 08-25-2008 08:53 PM
Windex alternative..Help kaniksu Gear & Maintenance 6 11-12-2007 02:14 PM
Sandblasting alternative? lee_1999 Gear & Maintenance 6 05-03-2002 05:48 AM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome