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jlandry 12-24-2005 03:23 PM

insulation
 
I live is San Antonio, Texas and am getting ready to build my house. Is there one kind of insulation that is bette than another(Batts, bibs, coccoon)? What about 2x6 outer walls instead of 2x4? Thanks for the info.

Mike Swearingen 12-25-2005 09:22 AM

Actually, you should compare R-values to choose which type that you want.
The way that energy prices are headed, I would go with 2X6 walls. (I even did that back in 1977, after the early 70's "energy crisis".)
IMHO, insulation is like good ventilation. You can't have enough of it. It will always more than pay for itself in the long-run. Energy efficient building is the key.
Good luck!
Mike

Teetorbilt 12-25-2005 12:25 PM

This is a good site to go play around in. http://www.buildingscience.com/ or http://www.dbia.org/index.html

Good book here. http://www.knovel.com/knovel2/Toc.js...node1698574855

Most of the new homes here are going to 'conditioned attics' Google it. It's what I would do if I were going new. You might want to look at foam block construction, something else that I would do.

AaronB 12-31-2005 11:59 AM

I say Spray Polyuretane foam. It will....

Create an air stop. This means it will stop airflow nearly 100% if properly done...it is estmaited that 40% of the average home's thermal conductance is due to air infiltration. This will create huge energy savings pretty quickly, and lessen the wear on the HVAC systems, as they do not have to run as much to aceive the same result.

Provide better R value per inch compared to regular fiberglass batt. 2.8 lb. closed cell foam is nearly R7 per inch.

Assist in wall structure anti-racking...structural stability.

Some also say that it helps to deaden noise from both outside the building and from within.

Hope this helps.

jlandry 12-31-2005 09:47 PM

Thanks for the info. I was just looking into the spray foam. There is only one contractor in San Antonio that does this. They do some kind of measuring and engineering where they gaurentee the heating and cooling cost of the home for the life of the home. It is kind of interesting that they do not have any insulation in the ceilings. They spray the underside of the roof. Any more info on this method?

AaronB 01-06-2006 08:51 PM

I would definitley not like to see this done on the underside of the roof because it will create a heat sink....very bad if you have wood or asphaltic roofing, or a plywood roof deck.

Teetorbilt 01-06-2006 10:26 PM

Aaron, I would suggest that you visit the site that I posted. Conditioned attics are happening here and appear to be what is coming. It makes perfect sense to me, stop the temp + or - before it enters the structure.

747 01-07-2006 01:28 AM

I agree with mike go 2x6 construction. I agree with aaron spray foam in 2x6 walls would rock. I also agree with aaron that i wouldnot let them spay under the roof. AS far as teetor aaron and I live in northern illinois and i think what he is talking about is probably something that is picking up steam in hot climates. Your in a hot climate so it might be something you should investigate. That is the first time i have ever heard of what teetor is describing. But i will take it one step further and say this. If i lived in texas and was building a new house i would go with cement. They make insulated forms and you pump cement in them and it is a solid quite house. I don't no anybody in northern illinois who does that. I did ask cole 21 about it and he new all about it. jlandry cole 21 is a builder in texas.

AaronB 01-07-2006 08:58 AM

Teetor, i think you have a valid point about stopping it before it enters, that is why I need to get back to my invention workshop. :)

I will creat a plan to adrerss this issue and be rich! :cool:

Teetorbilt 01-07-2006 06:14 PM

Aaron, I'm an engineer as well as a contractor. Part of my business is selling window treatments and I love how some of the companies advertise. 'Cellular shades insulate by 30%!' Bull! Once the heat has passed through the window, it's inside the house, period!

It's the same with a roof. If it's 120 deg. in the attic, some of that has to be getting into the house.

AaronB 01-07-2006 09:44 PM

Im not talking letting it into the attic either. Keep it out, keep the insulation below the rafters. Keep the underside of the roofdeck venting. This will even allow the attic to ba a conditioned space. How to do it?

Teetorbilt 01-07-2006 10:34 PM

Aaron, look this over. http://www.buildingscience.com/ and come back. You and Grumpy seem adverse to new tech. This is what is happening today, going over it seems stupid because we have been using the same principal on boats for 20 yrs.

It's not the cheapest, just the best that we know of to date.

AaronB 01-08-2006 09:21 AM

I am 100 % NOT adverse to new tech. This is, in fact, out of the box thinking I have done on my own. I just kno0w that insulating the underside of a roof deck will cause plywood delamination and create a heat sink effect, accelerating the aging process of the roofing if asphaltic or wood. Send me an email and I will discuss my ideas. What part of this website do you want me to look at?


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