Building Custom Foam Insulating Batts for Inside the Hull - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 01-15-2011
Bene505's Avatar
Glad I found Sailnet
 
Join Date: Jul 2008
Posts: 3,578
Thanks: 5
Thanked 39 Times in 38 Posts
Rep Power: 8
Bene505 will become famous soon enough Bene505 will become famous soon enough
Building Custom Foam Insulating Batts for Inside the Hull

What do you think about covering an inside section of the hull with wax paper or wd-40 and then spraying-in a layer of expanding foam.

After it dries, I'd cut it in half vertically so I can get it out, then trim it to a uniform thickness. Once trimmed for thickness, I'd put it back in place. This would make the insulation removable if I wanted to get rid of it.

I figure this would work for a lot of places where I have clear access to the hull. I would have to protect everything nearby (e.g. bulkheads) so that the foam wouldn't stick to them. I could choose a thickness that works well, perhaps an inch or two.

Any thoughts on this?

And, if you did this, how thick would you make it?

Regards,
Brad
__________________
.
.
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
.
The best minds discuss sailing.
.
Reply With Quote Share with Facebook
  #2  
Old 01-16-2011
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Well, a lot depends on how you're going to be covering the foam. It will need some protective interior facing to protect it from damage.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #3  
Old 01-16-2011
Bene505's Avatar
Glad I found Sailnet
 
Join Date: Jul 2008
Posts: 3,578
Thanks: 5
Thanked 39 Times in 38 Posts
Rep Power: 8
Bene505 will become famous soon enough Bene505 will become famous soon enough
SD,

I was thinking about using Reflectix on both sides, after I got the custom fit made. Then marine vinyl over the interior Reflectix.

I'm on the boat now, setting up the webcam I got for it. That's another story -- I can't see the webcam from the internet (the marina's ISP can't give me a port mapping), but I can push out a snapshot every x seconds to my ftp server. So that wil be very good for checking to make sure it's plugged-in



I looked up the R-factor of epoxy as an insulator. It was very close to concrete, About 1/100th the insulation of Reflectix, if I got it right. (There are Europeon R-factors and U.S. R-factors. I may have gotten them mixed up.) When I got here, it was 45 degrees with 1500 watts of heating and 30 degrees outside. So a little bit of insulation will go a long way.

Regards,
Brad
__________________
.
.
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
.
The best minds discuss sailing.
.

Last edited by Bene505; 01-16-2011 at 03:34 PM.
Reply With Quote Share with Facebook
  #4  
Old 01-16-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,625
Thanks: 68
Thanked 187 Times in 179 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
That spray foam is pretty hard to control once it's released and has space to expand.. I suspect it would be quite difficult to get consistent results. It's also one of the stickiest substances known to man if it gets away on you.

It'll be interesting to see how well it works in reality vs theory!
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #5  
Old 01-16-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,069
Thanks: 0
Thanked 68 Times in 59 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
Brad - that means you are our guinea pig. Hope it works. Keep us posted.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #6  
Old 01-16-2011
JimMcGee's Avatar
Member
 
Join Date: Jun 2005
Location: Barnegat Bay, NJ
Posts: 1,386
Thanks: 22
Thanked 29 Times in 27 Posts
Rep Power: 10
JimMcGee is on a distinguished road
Brad,
I'm not sure what parts of the hull you want to insulate, but have you thought about using rigid foam insulation with a layer of reflective foil applied with spray glue?

I'd think it would be easier to work with. You could score the back side to help it bend to the hull shape.

Jim
__________________
95 Catalina 30 Island Time

If a man is to be obsessed by something, I suppose a boat is as good as anything, perhaps a bit better than most" - E.B. White
Reply With Quote Share with Facebook
  #7  
Old 01-16-2011
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
scottyt is on a distinguished road
jim reflectix is basicly bubble wrap with a mylar coating. IIRC it alone is about r3 per 1/4 inch.
Reply With Quote Share with Facebook
  #8  
Old 01-16-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,069
Thanks: 0
Thanked 68 Times in 59 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
Actually less. The figures are for 1" and Reflectix is only about 5/16" thick.
From this site: Capt'n Pauley's Virtual Boatyard -- Projects Galore!!!: Installing Insulation in Your Boat
Attached Thumbnails
Building Custom Foam Insulating Batts for Inside the Hull-4.jpg  
__________________
Brian
Living aboard in Victoria Harbour

Last edited by mitiempo; 01-16-2011 at 08:31 PM. Reason: add
Reply With Quote Share with Facebook
  #9  
Old 01-17-2011
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Instead of reflectix, I'd use a mylar "space blanket" that was laminated to the foam. It won't add bulk, but will add a fair bit of insulation, at least in terms of reflecting heat.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #10  
Old 01-17-2011
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,555
Thanks: 2
Thanked 82 Times in 80 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Brad-
I would expect that any material which blocks off the inside of the hull, without actually being sealed to it, is going to create problems from condensate and mildew. Bad problems.
The traditional ways to prevent that are to either allow ventilation (i.e. by lining the hull with batts or lathing strips, and using those to create a vented air space) or to apply the insulation with adhesive, sealing it to the hull and moving the condensation zone into the interior of the insulation--where condensate can't form. Contact cement or basebard cement applied to the hull (a mildew resistant one, or one with added mildecide) and then a layer of ensolite or similar closed-cell foam would be a way to do that, sealed particularly well around all edges.
What's the worst that would happen if you spray foamed the hull? The foam might prevent a puncture from breaking through. And if you were holed, the foam can easily be torn away to effect repairs. I don't see it being an issue, except for access and aesthetics. (I wouldn't foam up into blocking the hull/deck bolts, for instance.)
If you DO decide to just lay something up against the hull, I'd suggest first cleaning the hull with bleach, etc., then spraying the hull with a mildecide to add that extra toxin before laying down the insulation. Once mildew gets a foothold....ugh.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Insulating Hull StephenBrooks Gear & Maintenance 1 03-10-2010 12:03 PM


All times are GMT -4. The time now is 03:47 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.