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posted by sculptor on Jan 23, 2015

Hello, I am a sculptor and have been using AAC as my medium for a number of years and my supplier just dried up! I teach classes in it and use daily and need a supplier fast. Can anyone offer me any help?

thanks,
Carole

Roxul Mineral Wool Insulation Batts
posted by tristan on Jan 2, 2015

Jon, as we wrote in our more detailed EBN review, the binder is formaldehyde. Testing shows that it emits from the product levels less than 0.0135 parts per million (ppm). Average background levels are 0.02 ppm. So in theory someone could react to this, but we are not emphasizing it in our writeup since the data shows it is a very minor point, especially when this insulation is placed...

Roxul Mineral Wool Insulation Batts
posted by jon on Dec 31, 2014

I was surprised that the review of this product didn't mention the urea-extended phenol formaldehyde binder. According to a EBN a Article "Formaldehyde is a known carcinogen, but according to the industry, almost all of the formaldehyde in mineral wool insulation is eliminated in the production process through a chemical reaction and high heat." Roxul claims low emission levels but sensitive individuals could have a reaction and would be cautioned not...

posted by pmelton on Dec 23, 2014

Soil is seriously undervalued, and there is nothing inherently green about biobased plastics, as we discussed in our feature article Biobased...

posted by eppie911 on Dec 22, 2014

I agree that the fossil fuels are limited. However, the properties of our top soil is limited also. I live in iowa, after seeing $8.00 + corn the farmers have ripped out every tree and weed to plant another row of crop ground. As our population increases so does the demand for energy and resources. It seems like we are substituting materials from underground to our top soil. As we attempt to curb the use of fossil fuels for (air quality)making products and energy, we are removing the qualities of our ground (top soil) that ultimately feeds us. It also increases the speed of natural...

posted by jrice01720 on Nov 22, 2014

I did ultimately install a Geospring in the basement of my house (prettygoodlakehouse.com). I can't hear it at all in the living space but the basement ceiling is quite heavily insulated. For me - since I was building basically a new house - the cost of the wiring was more than offset by not needing to do the gas plumbing and the exhaust gas ducting.

posted by atwilson on Nov 22, 2014

Our Geospring water heater is located in our basement, separated from the living space only by an uninsulated floor. If the door to the basement is closed we can't really hear the water heater (about the same decibel level as a refrigerator) from our living space upstairs. I would think in a garage if there's an insulated ceiling above there would be no noise migration at all.

Noise was a factor we considered, though. We installed it in a separate room in the basement that we could insulate if we need to. We also chose the quietest HPWH that was available when I was researching...

posted by jacksonlui on Nov 21, 2014

i've been looking at these water heat pumps and the hidden costs and considerations are installation requirements (30A circuit), location of demand points, noise (huge factor because many garages in san diego are located below a bedroom), and the initial costs. I had wanted to build a house with PV cells + water heat pumps. Whether it's one large one or several small ones around the house closer to faucets and showers. Looking at it from several angles, I can't seem to justify it even though it's what I want to do because I love the coolness factor. It's not really as straightforward...

posted by dleffingwell on Nov 8, 2014

Answering my own question... I just found your articles on the...

posted by dleffingwell on Nov 8, 2014

What caught my eye from the eMonitor screenshot was that the...

posted by sculptor on Jan 23, 2015

Hello, I am a sculptor and have been using AAC as my medium for a number of years and my supplier just dried up! I teach classes in it and use daily and need a supplier fast. Can anyone offer me any help?

thanks,
Carole

posted by pmelton on Dec 23, 2014

Soil is seriously undervalued, and there is nothing inherently green about biobased plastics, as we discussed in our feature article Biobased...

posted by eppie911 on Dec 22, 2014

I agree that the fossil fuels are limited. However, the properties of our top soil is limited also. I live in iowa, after seeing $8.00 + corn the farmers have ripped out every tree and weed to plant another row of crop ground. As our population increases so does the demand for energy and resources. It seems like we are substituting materials from underground to our top soil. As we attempt to curb the use of fossil fuels for (air quality)making products and energy, we are removing the qualities of our ground (top soil) that ultimately feeds us. It also increases the speed of natural...

posted by jrice01720 on Nov 22, 2014

I did ultimately install a Geospring in the basement of my house (prettygoodlakehouse.com). I can't hear it at all in the living space but the basement ceiling is quite heavily insulated. For me - since I was building basically a new house - the cost of the wiring was more than offset by not needing to do the gas plumbing and the exhaust gas ducting.

posted by atwilson on Nov 22, 2014

Our Geospring water heater is located in our basement, separated from the living space only by an uninsulated floor. If the door to the basement is closed we can't really hear the water heater (about the same decibel level as a refrigerator) from our living space upstairs. I would think in a garage if there's an insulated ceiling above there would be no noise migration at all.

Noise was a factor we considered, though. We installed it in a separate room in the basement that we could insulate if we need to. We also chose the quietest HPWH that was available when I was researching...

posted by jacksonlui on Nov 21, 2014

i've been looking at these water heat pumps and the hidden costs and considerations are installation requirements (30A circuit), location of demand points, noise (huge factor because many garages in san diego are located below a bedroom), and the initial costs. I had wanted to build a house with PV cells + water heat pumps. Whether it's one large one or several small ones around the house closer to faucets and showers. Looking at it from several angles, I can't seem to justify it even though it's what I want to do because I love the coolness factor. It's not really as straightforward...

posted by dleffingwell on Nov 8, 2014

Answering my own question... I just found your articles on the...

posted by dleffingwell on Nov 8, 2014

What caught my eye from the eMonitor screenshot was that the...

posted by acksolarsolutions on Sep 18, 2014

You simplified PV to much. Inverters and panels can stop working so there is maintenance. Also you lose a lot of those electrons moving though inverters and from roof or barn into the house, especially on smaller wires. The true measure of a PV should be how much energy is available at a point of use in vs. generated by the panels?

A well designed Solar thermal hot water heating system a little maintenance. Glycol protects the system from freezing and steam-back (a larger expansion tank) protects the system from blowouts during a power outage . If the internet is available, a...

posted by bdez on Aug 12, 2014

Hello - This alert is very helpful. I am repainting the interior of my house, and am finding it hard to locate sources of your editors picks so as to assess prices. Can you help with either sources in the Washington DC area, and/or average costs per gallon of the four types?
Many thanks for any advice,
- Barbara

Roxul Mineral Wool Insulation Batts
posted by tristan on Jan 2, 2015

Jon, as we wrote in our more detailed EBN review, the binder is formaldehyde. Testing shows that it emits from the product levels less than 0.0135 parts per million (ppm). Average background levels are 0.02 ppm. So in theory someone could react to this, but we are not emphasizing it in our writeup since the data shows it is a very minor point, especially when this insulation is placed...

Roxul Mineral Wool Insulation Batts
posted by jon on Dec 31, 2014

I was surprised that the review of this product didn't mention the urea-extended phenol formaldehyde binder. According to a EBN a Article "Formaldehyde is a known carcinogen, but according to the industry, almost all of the formaldehyde in mineral wool insulation is eliminated in the production process through a chemical reaction and high heat." Roxul claims low emission levels but sensitive individuals could have a reaction and would be cautioned not...

AdvanTech OSB
posted by notes2jill on Sep 24, 2014

Brent thank you!

AdvanTech OSB
posted by behrlich on Sep 24, 2014

Hi Jill,

You raise a good question, but rest assured that Huber is not adding free formaldehyde. I spoke with the company and they are simply accounting for the free formaldehyde that occurs naturally in wood. They should probably make that clearer, though.

Thanks, Brent

AdvanTech OSB
posted by notes2jill on Sep 23, 2014

According to the MSDS (http://www.huberwood.com/assets/user/library/AdvanTech_MSDS_2013.pdf), AdvanTech contains "free formaldehyde." Adding formaldehyde would seem to negate the benefits of using MDI and PF instead of UF, no? Or is it really low-emitting, and what does this mean? Thanks for your great...

Matrix Total Home System
posted by buildingshelter on Aug 26, 2014

Does anyone have experience with the Matrix by NTI?

posted by behrlich on Aug 13, 2014

Hi Evan, We share your nano concerns, and as a precaution, GreenSpec does not list nanotechnology products. I chatted with another one of their reps who said he has never sold this as "nano." He said it is a standard sodium silicate. And there is no information in the company's literature suggesting they have engineered this product to be <100 nm, so my guess is the manufacturer rep your wife spoke with was trying to hype the product and confused the chemical reaction with nanotechnology. I suppose it is possible that some of the particles are <100 nm naturally, but the company is...

posted by levi on Aug 13, 2014

My wife looked into this product and was told by a manufacturer's rep that Armor products rely on nano technology to achieve it's high strength. It would be good if GreenSpec indicated if the products being reviewed have nano technology in their ingredients, so that readers can make an informed decision.

posted by sbluestone on Aug 4, 2014

It's an interesting looking unit, but with its very large footprint, it is essentially useless for urban multi-family buildings in markets such as New York. Real estate is just too expensive to allocate this much floor area to a ventilation system.

posted by Nadav Malin on Jun 4, 2014

Online reviews of this product seem to be quite good, although I did see a comment that it's difficult to install. And one homeowner reports being quoted a price of $4.64/ft2, plus $1.43/ft2 for installation for a 1,900 ft2 job.

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