Part3 in my series – "How to build a better house". Last week we talked about advanced framing techniques, which in simple terms replaces lumber with insulation material and maximizes the wall that’s insulated. This effectively improves the thermal resistance or R-value of a wall. As a reminder on how important advanced framing is, let's look at the comparison of a standard wall vs a wall constructed with advanced framing again:

A standard wall assembly using R-13 batt insulation will have an effective R-value of 11.1. An "advanced" wall assembly will have an effective R-value of 14.6 or 30% higher than the traditional wall. 

This week I want to focus on the different kind of insulation materials we can use to use that give you the most energy efficient green home.

In general, insulation is one of the most important components in any responsibly built structure, especially in green buildings. Insulation reduces energy consumption and if properly installed, can reduce draft dramatically. From that perspective, any insulation material is a “green” product.

The choice of insulation material will be covered in my next article "Insulation techniques……or how to build a better house – Part4" and has a lot to do with where the insulation is installed (wall, ceiling, roof, crawlspace etc etc), the climate area you live in and the specific details of your wall assembly.

So let's look at some of the different kinds of insulation materials that are out there these days:

Fiberglass Insulation:
This is the standard in the building industry today. High-density fiberglass makes the same wall cavity 15 to 20 percent more effective in reducing heat loss. The majority of manufacturers now incorporate at least 30 percent recycled material, and there are quite few products that carry third-party verifications for their recycled-glass content. If Fiberglass insulation is used as a batt, it is important to know that most of them are manufactured with phenol formaldehyde as a binder, though some products use alternative binders or no binder at all. So be sure and investigate the contents of the product you want to use in your green home.

Cellulose Insulation:
Is primarily made out of recycled newspaper, but not always from post-consumer sources. It is often damp-sprayed into open cavities, or blown into closed cavities at relatively high density. Cellulose adds to the airtightness of the house—and by forming a good infiltration-barrier. It is also less quality control dependent in filling voids than fiberglass batts (in simple terms… not as easy to mess up

Rigid Foam Insulation:
Rigid foam insulation applied to framing yields added infiltration resistance, reduced frame conduction losses, and higher overall wall R-value. Extruded polystyrene (XPS) and polyisocyanurate (polyiso) rigid foam insulation used to be made with ozone-depleting CFC blowing agents, but when ozone depletion was identified as a major environmental problem, the CFCs were replaced with HCFCs through international agreement. HCFCs were eliminated from polyiso insulation as of 2003, but they are not scheduled to be totally eliminated from XPS until 2020. Polyiso is currently produced with hydrocarbon blowing agents. Expanded polystyrene (EPS) rigid foam has long been made with non-ozone-depleting pentane rather than HCFCs.

Spray-Polyurethane Foam insulation:
One of my favorite insulation materials, spray-foam is an excellent choice for most buildings. Though slightly more expensive than the other materials mentioned above, the qualities of spray-foam will give you "a lot of bang for your buck". As the name implies, it is sprayed into open cavities and quickly expands to about 100 times its original volume. Most manufacturers claim R-values of about R-3.8 per inch. Several manufacturers sell water-blown products though there are still quite a few that use HCFCs or hydrocarbon blowing agents which are harmful to the environment and your health. So again, beware of what you buy.

Of course, there are a myriad of products available on the market today. If you want detailed information, I have included some manufacturer links below. If you want to find out specific product details while you are in the process of building your home, try the product directory at http://GreenBuildingAdvisor.com (Paid subscription) or http://www.buildinggreen.com/ (Paid subscription). They have great product databases with all the relevant product information.

I should mention that most of these materials can be installed in different ways – Loose fill, batts, spray or rigid boards. What to use "where" and "why", will be covered in my next article.

Be sure and come back. Don't miss next week's article. Insulation Techniques… or “How to build a better house” – Part4

Links to other articles in this series:

Thermal Bridging… and how it affects a wall assembly – Part1

Advanced Framing Techniques – Part2

Some Manufaturer Links:

http://www.certainteed.com/- Fiberglass

http://www.applegateinsulation.com/ – Cellulose

http://www.knaufinsulation.us/ – ECOBatt

http://www.demilecusa.com/ – SprayFoam

http://www.icynene.com/

Sources:

http://www.greenbuildingadvisor.com/

http://www.buildingscience.com
http://www.toolbase.org
http://resourcecenter.pnl.gov
http://www.energysavers.gov

Or is it? There is a lot in the news lately about whether this whole Green Movement is based on a hoax or not.  My take on that as far as Green Building goes is, “What does it matter?”  Sustainable development makes sense all the time, not just because it’s a fad or that its popularity has resulted from government policies and concern about Climate Change.

Building more energy efficient housing saves consumers money through lower utility bills and extends existing energy supplies.  Using re-manufactured products or products from forests with sustainable replenishment policies also extends the life of valuable resources.

Reducing product waste helps extend the life of existing landfills in population centers with growing communities.

So building Green saves money, is smart and contrary to what Kermit says, “It is easy being Green”

Blog Written by:Wesley Scott
wes@archwaysandceilings.com
www.archwaysandceilings.com

Your walls alone are not adequate to protect you from the sound, pests and weather outside. They are not as tough as you think. It is necessary to have a blockade between walls to keep the pests, cold and dampness out of the house and the heat and sound in. Some kind of insulation is already fitted in most of the homes, but they all aren’t created equally.

Many of the older homes are prepared through fiberglass insulation. Though fiberglass is low-priced and to some extent effective in controlling climate, but it saves small amount of energy and offers minimal protection. It can also be unsafe for your health. A touch of fiberglass makes your skin sore and itchy and inhaling a sharp fiber can lead to serious health problems. They can create scars in your throat that can cause more problems.

Spray foam insulation is an alternative to traditional fiberglass and it helps to construct very strong barriers between the outside world and your home. Spray foam solidifies as a spongy substance, as it is liquid polyurethane. Given that it applies in a liquid form, spray foam fills even in the tiniest cracks and enters the whole surface that is being treated.

While fiberglass can be easily torn, chewed, or easily displaced eventually, spray foam sticks everlastingly to that area. Its strength and texture makes it difficult for anything to enter through it. Even mold and water are discouraged to seep in and cause damage. Thus spray foam insulation is a better and safer alternative to another material.

The benefits of spray foam insulation also comprise of the betterment of soundproof walls. Loud voice is dampened by the broad surface. It can also be applied on floors and ceilings.

Spray foam is also called as ‘green material’ because it keeps the home warm during winters and cool during the summer. This way it saves far more energy than fiberglass.

Recyclable and renewable resources are also used to create spray foam and this way it helps in contributing to our environment and to the economy. Initially it seems to be expensive, but this insulation gradually helps you in saving money in the long run, as it increases the value of the home and saves a lot on your electric bills. Spray foam insulation is a safe, green alternative to other insulation materials with various benefits.