Talk:Thermal insulation
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Fantastic update done today Sept 28 2006. Couldn't have done better myself. -geniescience.
Please add link to thermal resistance and how to calculate temperature drop across material. Initial material for all entries should be at the 4th grade level followed by more exact definitions at the 8th, 12th and then post doc levels. This will ensure maximum accessibility to the general population. A good source for this entry and thermal conductance is at www.omega.com/temperature/Z/pdf/z119-121.pdf
NOTE these comments now apply to the Building Insulation article, as it was created with the latter 80% of this article. Please move there, as appropriate.
Looks like all the following comments pertain to the NEW building insulation article, and so shoudl be moved there entirely. Will be glad to do so, soon, if no objection. --
[edit] Wikify
This article does not conform to several Wikipedia guidlines, and as such is a prime candidate for Wikification. A short to do list to get started with Wikification:
- Remove or rewrite several sections that read as "how-to"s. Read Wikipedia:What Wikipedia is not
- Remove first- and second-person usage
- Move material, especially the sections on individual types of insulators, to separate articles to reduce the size of the article and bring focus back to a discussion of what thermal insulation is
- Rewrite the introduction section to better reflect the article. Read Wikipedia:Lead_section
- Move information about health effects to another article, and replace it with a single paragraph. The primary point of this article is to examine insulation, not human interaction with insulation
- Reduce the size of the R-values sections. There is already a separate article on R-values, so there is no reason to go into such depth here.
The fact that there is so much that needs fixing does not indicate that this is a bad article—to the contrary, it highlights the ambitious nature of the authors in trying to be a bit too thourough.
Âme Errante 23:11, 30 July 2006 (UTC)
I have started some more re-writing. Today I gave the first few paragraphs a quick bash to get most of the fluff out, but I will get some sensible structure to the article in my next effort. --Slashme 09:02, 27 September 2006 (UTC)
[edit] Cavity Walling
Can anyone explain to me how cavity walling helps to insulate a home by telling me how it stops conduction, convection or radiation of heat and the advantages it has over a solid wall and a wall with a gap but no insulation inside. I just can't get my head arround this for some reason.There are different types of insulation.
[edit] Cavity wall: Something to know about air and heat transfer in the building envelope...
Heat transfers from warm to cool, it can occur through: conduction, convection or radiation. Conduction is most effective and faster way of transfer; it is the transfer of heat between two objects in contact. Convection occurs though fluids or gases; a cool fluid in contact with a warm solid will heat up through conduction. Radiation is heat moving through space, directly into a solid object (Sun through the atmosphere heating solids).
So what about buildings?... That’s exactly how heat transfers in a building… Heat will be conducted through radiation (through the windows). Convective heat will be driven in and/or out by openings (drafts). And the rest will be transferred through conduction through the walls, floor, ceiling (the building envelope). All these elements are made of materials that have some resistance to heat transfer. The higher the resistance, the longer it takes to the heat to move through the element. If the elements are solid (bricks, slabs, rocks, etc.), then the heat transfer will occur through conductivity. In order to provide resistance to heat transfer, the element thickness can be increased and this will delay the heat transfer (time lag). Another option is to use a material which is poor heat conductor. Insulation… Air is good insulator (low conductivity). If a wall is built with a cavity gap, heat will have to be transferred through convective air currents (except in the studs, which will be through conduction). This will delay the transfer (comparing with a solid wall), so it is good, but sometimes not good enough as heat have a straight path to be transferred from the warmer layer to cooler layer through the air (by convection) and then will reach the other side of the wall. The air provides slower heat transfer but the problem is that it is a direct path. In order to slow down the air currents by providing “non straight paths” the air gap could be split is various enclosed areas.This is what insulation does, in general these materials are made of materials which are very poor conduction of heat enclosing air gaps. In order to maintain its properties it is important to maintain the air gap by not squashing the material. So Air gap (or small enclosed air gaps) are an effective way of delaying heat transfer comparing with a heavy mass wall (like adobe or concrete wall)...
[edit] What is cavity walling?
A wall with an air gap in the middle...
[edit] This page will be a work-in-progress for a long time
For anyone referencing the Insulation page, please be aware that there's still much work to do in making the page complete, coherent, grammatically-correct, and well-organized. I'm gradually integrating my own notes into the existing entries, trying not to delete anyone else's entries whenever possible, and trying to organize the topics in a logical way. The page might look somewhat chaotic for a while.
[edit] Update, 5 Feb 2005
I've completed and cleaned up the Insulation page to the best of my ability. Can someone knowledgeable see if there are any errors, answer the Lingering Question that I left in the spray foam section, and find out the R-value for Dow Chemical's Great Stuff in the typical R-values per inch section? Thanks. - N3362.
It's a lot of good info. Probably needs an intro above the contents, and probably the second person "you" should be changed to third person or whatever the style guide says. Rtdrury 23:32, 6 February 2006 (UTC)
Thanks, Rtdrury. I agree with you about not using second person "you". Sometimes, it is difficult to stay in active voice, not use second person, AND not sound stilted and phony. I can't stand when people insist on using passive voice, which encourages vague, imprecise writing. I wrote this article while doing research on how to rescue my circa-1939 uninsulated, broken-roofed cottage sitting on top of an underground river in a mountain swamp. I've spent way too much time on this article (as well as Weatherization, Thermal mass, Vapor barrier, Mold, and other associated articles), so I'll leave the grammatical and style fixes for someone else to take on, while I return to fixing my cottage. You'll notice that I left plenty of references at the end of the article for anyone to look further into any topic. I'd love to come back and insert some JPEG images, showing the different types and different manufacturers of rigid panel insulation, for example, but every image I have is copyrighted. I might have to go to a building supply store and take some pics myself with a digital camera, assuming the store owners let me. N3362 01:57, 8 February 2006 (UTC)
Darn good start N3362! I will try to assist by adding some more technical info which is needed. Need: Note about R versus RSI as well.
- The following discussion is an archived debate of the proposal. Please do not modify it. Subsequent comments should be made in a new section on the talk page. No further edits should be made to this section.
The result of the debate was move. —Nightstallion (?) 20:51, 19 February 2006 (UTC)
[edit] Requested move
Insulation → Thermal insulation – {This move is tied to the moving of the article currently at insulator. The article about electrical insulation is currently at insulator, while thermal insulation is at insulation. This is ambiguous, as electrical and thermal insulation can both be referred to as insulation or insulator. I suggest that they be moved to electrical insulation and thermal insulation. Insulation would be turned into a disambiguation page, while insulator would either redirect to the insulation disambiguation page or be made into a separate disambiguation page.} copied from the entry on the WP:RM page
I suggest that the discussion take place on the Talk:Insulator page.
- The above discussion is preserved as an archive of the debate. Please do not modify it. Subsequent comments should be made in a new section on this talk page. No further edits should be made to this section.
[edit] Isn't this backwards?
Under the typical R-values per inch it says: "Air with no external wind = R-1 (still) to R-5 (with convective currents)." Wouldn't still air have a higher R-value?
Yes, you are correct. Thanks for catching this error! N3362 20:21, 4 April 2006 (UTC)
[edit] Too much emphasis on construction.
This page is about thermal insulation, but the term seems be used throughout the article to refer to thermal insulation in construction, a less important aspect of thermal insulation than thermal insulation in clothing or body fat. After a large amount of information regarding thermal insulation in construction, there is a sub heading "insulation in construction", with more information. Please put the lot in a separate article.
[edit] UFFI
I think this section is a little off. From what I understand UFFI is still used in Europe, and was found to harmless in some engineering/toxicology stuides precipitated from a lawsuit filed in Quebec. Classic knee jerk reaciton. Will try to clean this up when I can dig up appropriate sources. --Mf135gas 17:21, 31 July 2006 (UTC)
[edit] Thermal insulation
What is thermal insulation? -- 66.238.170.38 19:09, 9 February 2007 (UTC)
- I modified the text above. I assumed that this was meant to be a question of what thermal insulation is. Unfortunately, the purpose of talk pages is to discuss the article, not the subject. My first suggestion to help you is to read the article. If that does not help, you can try the references. If that does not work, I suggest finding someone knowledgeable about physical science. -- Kjkolb 19:25, 9 February 2007 (UTC)
