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Author Topic: Reflective insulation  (Read 8907 times)

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Offline okie

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Reflective insulation
« on: January 13, 2009, 09:53:18 PM »
Anyone ever use reflective bubble insulation? Saw some at the hardware store, label says it blocks 95% of reflective heat and blocks most of conduction. It is 5/16" thick and is comprised of a layer of foil, layer of polyethylene, and layer of bubbles.  It says the foil blocks reflective heat and the bubbles block the conductive heat.  The brand I saw was Refletix (? SP).
 The package didnt state a R value but clerk says many local contractors have started using the material and several homeowners swear by it, they used to onlyy special order but have started stocking the product.
The price was quite a bit lower than the fiberglass insulation.
Striving to create a self sustaining homestead and lifestyle for my family and myself.

Offline scsmith42

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Re: Reflective insulation
« Reply #1 on: January 14, 2009, 08:16:14 AM »
Okie, I've used it quite a bit, and learned that it is quite effective in certain situations, but not all.Z 

It workes very well for keeping heat in (reflective and emissive), such as what you'd need in an oven.  Another example would be keeping cold or hot air inside a duct, well cold or hot.

It does not work well at all for keeping "passive" temperatures in or out.

My kiln is built inside a steel container, and it works quite well to keep the heat inside the kiln.  On a cool day, if it' is 135 degrees inside the kiln the outer metal skin will be whatever the ambient outdoor temp is - say 70- degrees.

A good spray foam insulation is probably better in terms of overall effectiveness.  I have some insulated containers, and when it's cool at night they will stay fairly cool during a hot day (passive temp does not migrate through the foam insulation).  However, in my kiln (if it's not in operation) it will be just as hot or cold inside as it is outside - ie the passive temp passes right through the insulation.

The brand that I use is called Tekfoil (purchased from farmtek.com).  I also use it underneath concrete slabs to serve both as a vapor barrier as well as an insulation to reflect heat from the radiant heating in the slab back up into the building.
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Offline Paso

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Re: Reflective insulation
« Reply #2 on: January 14, 2009, 02:44:45 PM »
It works great on the ground when installing radiant floor heat forces the heat up.

I was attaching photo but the site doesn't accept Jpegs

Online beenthere

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Re: Reflective insulation
« Reply #3 on: January 14, 2009, 04:28:26 PM »
Welcome to the forum, Peso.

What site doesn't accept jpegs?   This one does.  :) :)

Go to help button above to learn to post. It is easy, and now we have the java uploader that resizes for you.

Seems to me bubble insulation would be somewhat temporary...that is until the bubbles are no more. I'm not a believer in plastic holding up for very long.   ::) ::) ::)
But until that happens, suspect it is good insulation.
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Offline Paso

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Re: Reflective insulation
« Reply #4 on: January 14, 2009, 06:04:28 PM »
105-0501_IMG.JPG.
You cannot upload that type of file. The only allowed extensions are xlsx,txt,doc,pdf,xls,wks,avi,mov,mpg,html,htm,shtml,kmz,eml.

This is what I got when attempting to attach my jpeg

Offline Radar67

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Re: Reflective insulation
« Reply #5 on: January 14, 2009, 06:31:03 PM »
Welcome to the forum.

Pictures can't be attached to a post. They have to be loaded to your gallery here on the forum, then linked to. The help section will cover the steps to set up the gallery and upload the pictures.
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Offline Paso

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Re: Reflective insulation
« Reply #6 on: January 14, 2009, 08:11:32 PM »
Sorry  Most of the forums I belong to allow the pictures to be attached to the post.

That usually helps the topic along :)

Offline okie

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Re: Reflective insulation
« Reply #7 on: January 14, 2009, 08:41:40 PM »
Thanks for the responses. I just had'nt seen the stuff before and was curious about it.
Striving to create a self sustaining homestead and lifestyle for my family and myself.

Offline Paul_H

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Re: Reflective insulation
« Reply #8 on: January 14, 2009, 10:50:29 PM »
Sorry  Most of the forums I belong to allow the pictures to be attached to the post.

That usually helps the topic along :)


Like this..

 




or this?





That would be really cool,I'll ask Jeff if he can do some tweeking with the software that would let us have pics in posts :)
Science isn't meant to be trusted it's to be tested

Offline Tom Sawyer

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Re: Reflective insulation
« Reply #9 on: January 15, 2009, 08:33:04 AM »
Sorry  Most of the forums I belong to allow the pictures to be attached to the post.

That usually helps the topic along :)


Like this..

 

(Image hidden from quote, click to view.)


Where did you find the 2 headed deer?

Offline scsmith42

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Re: Reflective insulation
« Reply #10 on: January 15, 2009, 09:01:24 AM »
Hi Paso - welcome to the FF!  I recently poured a slab with radiant heat and the bubble insulation, and can post a photo.

Here is a photo of the slab pour for my new shop.  The white material underneath the wire and tubing is the Tekfoil radiant barrier insulation.

 

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Offline stonebroke

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Re: Reflective insulation
« Reply #11 on: January 15, 2009, 10:27:32 AM »
Is that all you used or did you put foam under it also?

Stonebroke

Offline scsmith42

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Re: Reflective insulation
« Reply #12 on: January 15, 2009, 11:19:03 AM »
SB - I just used the Tekfoil, because my intention was to reflect all of the heat upward into the building and minimize the heat loss into the ground. 

After compacting the soil, I placed a few inches of gravel and then put the Tekfoil on top of the gravel (the tekfoil also serves as a moisture barrier).

However, I'm in North Carolina and we don't get the depths of freezing like our Northern Cousins.

If I had a situation where I had some extremely cold ground underneath my building, I would consider using styrafoam as a thermal break and to minimize passive cold transfer, with tekfoil on top to reflect the heat upward into the building instead of downward into the foam.  The foam would keep the cold out, and the tekfoil would keep the heat in, and my utilitiy bills should thus be minimized.  If the building was not going to be heated, I would skip the tekfoil and only use the styrafoam.
Peterson 10" WPF with 65' of track
Smith - Gallagher dedicated slabber
Tom's 3638D Baker band mill
and a mix of log handling heavy equipment.

Offline stonebroke

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Re: Reflective insulation
« Reply #13 on: January 15, 2009, 12:47:18 PM »
So you have no thermal break around the perimeter of your shop?

Stonebroke

Offline Don_Papenburg

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Re: Reflective insulation
« Reply #14 on: January 15, 2009, 07:17:52 PM »
I was informed by some radiant heat gurus that a radiant barrier has to have an air gap to work properly (most efective) Then it needs some sort of good Rvalue insulation to help out .   
I put 2" of extruded foam  under my concrete over a visqueen moisture barrier.  Then my pex and then rebar and wire.    Covered it with a bit of concrete
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Offline Paso

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Re: Reflective insulation
« Reply #15 on: January 15, 2009, 08:42:36 PM »
Okay I see I have to upload the picture to the gallery that I create then attach it to my post.

I have usually attached it directly from my computer.

It's nice to be new to the site and get so many nice welcomes.

What was with the warning I got saying only these files can be  uploaded?

Offline scsmith42

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Re: Reflective insulation
« Reply #16 on: January 15, 2009, 09:10:35 PM »
So you have no thermal break around the perimeter of your shop?

Stonebroke

Not on the outside - it doesn't get that cold here (the ground rarely freezes). 
Peterson 10" WPF with 65' of track
Smith - Gallagher dedicated slabber
Tom's 3638D Baker band mill
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Offline stonebroke

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Re: Reflective insulation
« Reply #17 on: January 15, 2009, 10:45:02 PM »
Boy are you lucky  or maybe just smart enough not to live up here.

Stonebroke

Offline woodbowl

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Re: Reflective insulation
« Reply #18 on: March 07, 2009, 10:01:41 PM »
About the color silver. The ability of the color silver to reflect heat in the broad daylight is understandable, but it befuddles me that a mere color, (silver) sealed inside a dark wall claims to do the same. Does anyone know the technical reasoning for this?
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Online Ianab

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Re: Reflective insulation
« Reply #19 on: March 07, 2009, 11:43:34 PM »
About the color silver. The ability of the color silver to reflect heat in the broad daylight is understandable, but it befuddles me that a mere color, (silver) sealed inside a dark wall claims to do the same. Does anyone know the technical reasoning for this?

Well light doesn't go through walls, but Infra-red light (heat) can. So by relfecting it back into the room, it acts as insulation. Every object thats above absolute zero radiates infra red energy, even the internal parts of your wall.

So anyway, another layer of insulation inside the wall will increase the total insulation value of the wall.

Ian
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