» passive design

South Sound Green Tour April 16th & 17th

Cory — Thu, 03 Feb 2011 00:29:20 +0000

The Eco Builders Guild, South Sound chapter is proud to announce the second annual South Sound Green Tour coming April 16th & 17th. We started the Green Tour last year and it was huge success. Just like last year, we will feature houses and commercial sites that represent the best in green building and sustainable practices. The homes are located through out Thurston County, including Tumwater, Olympia, and Lacey. We will also have workshops at each site demonstrating many of the features of each site. This year we have also added an expo which will be located in the new Lott buildings parking lot. It will house lots of vendors offering a huge array of green products and services.

Another big addition to the tour is that the Seattle chapter has joined in with us and will have a tour of their own on the same weekend. For more information, or if you would like to be a vendor or site sponsor please visit http://www.ecobuilding.org/events/2011-green-home-tour.

Additional Tips While Choosing Windows

Cory — Mon, 01 Feb 2010 08:11:32 +0000

1. Shades, Awnings, Blinds, Curtains and even foliage around the windows can affect solar heat gain and can also be a cheap way to cool the house.
2. There are five parts of a window that affect its energy efficiency: Glazing technology; Frame; Operating Type i.e. how it opens and closes; Low-E coatings; Gas fills; Spacers. You need to check all these aspects of a window and ensure that they are the best suited for your climate.
3. Depending on the kind of problem you think you’re likely to have, focus on each of the six parts mentioned above. For instance:
a. If you live in predominantly warm and sunny climate, then you will need to focus on Glazing, Low-E coatings
b. If your weather is humid, then attention to spacers, frames and operating type will keep condensation and leakage problems in check
c. In cold climates, glazing, frame, spacers and gas fills need to be checked well before buying
4. Energy-efficient mortgages are a way of paying for energy efficient windows, which typically cost more than regular windows. This actually turns out to be quite cost effective, because the savings on energy and utility bills arising out of energy-efficient homes offsets the monthly mortgage payments. To get more details, visit the energy department in your state.
5. Important: Get your energy efficient windows installed by a professional. If not installed properly, they will be less efficient than even regular windows. . Make sure your installation expert has experience in installing windows and is familiar that particular manufacturer.

Windows and insulation

Cory — Sun, 24 Jan 2010 08:58:11 +0000

Sometimes getting the U-Factor, SHGC and VT values right is not enough. Often, the installation of the window itself, i.e. the entire window assembly can have flaws. These flaws result in air leakage – one of the main obstacles in trying to achieve energy efficiency with the help of windows.
If your house is built on the Passivhaus principles; or you are looking at seriously reducing your HVAC requirements (and thus the bill) then air leakages through windows can punch a large through your plan. Some energy efficient windows specify the AL value (expressed in cubic feet of air passing through for every square foot of the window assembly) between 0-1. The lower the value, the lesser the leakage. The industry-accepted value is 0.30.
Another problem for insulation is condensation. If you live in cold areas, you’ve probably seem frost or dew on the edges of the windows. Looks quite ‘Christmassy’ but it only means that much more heating load. Condensation happens when inside warm air comes into contact with cold panes and glass, which essentially means your windows are not doing such a good job insulating.
With condensation and air leakage, there aren’t fixed ratings to go by. However, certain materials and window technologies work better. For example, if you’re opting for multiple pane windows, looks for stainless steel spacers, or thermally improved spacers made from silicon foam or butyl tape. These spacers might be more expensive, but they are better are insulating, sealing and thus preventing unwanted heat transfer, while at the same time allowing from seasonal expansions and contractions in panes. Similarly, opting for energy efficient windows with two or more panes or glazing reduces condensation even at indoor humidity levels of 45-60%. This is especially true of windows with argon/krypton glass filled windows.

Windows and Natural lighting

Cory — Wed, 20 Jan 2010 08:09:34 +0000

It is very evident that the larger your window, the more natural light it will bring in. Depending on the positioning of your windows, and its visible transmittance (VT) value, your windows could provide you with enough natural light to greatly minimize if not eliminate electric lighting requirements during daytime.
VT values are generally given between 0-1. A rating of over 0.70 is the highest you can get with clear glass windows devoid of any coatings or tints. The more the number of panes, coatings and tints the lower the VT value.
A high Visible Transmittance has another advantage – it eliminates the cooling function which is usually required in a house that uses electric lighting. A high VT value is especially important when a home is built using passive house principles or design.
However, one thing to consider when it comes to VT, is that a window with a high VT value, will also admit that much more solar energy (heat) inside the room. Thus, a clear glass window with a VT of 0.8 will also have an SHGC of over 0.60 – something not at all desirable in a warm or sunny climate.
To get around this, one can use Low E coatings, which are invisible, and yet block heat gain considerably. These coatings also protect indoor furniture and upholstery from the damaging effects of UV rays. Another way is to have operable windows that you can open up to air the room out frequently. Needless to say, a good ventilation system is important when you have large windows and a sunny climate.
For windows that are low on SHGC and high on VT, look for a high Light-to-Solar gain ratio. This determines how much more light is let in without adding to the heat.

Olympia’s own Green Tour

Cory — Wed, 09 Dec 2009 14:36:41 +0000

The ECO-Builders-Guild
South Sound Chapter
Presents
The South Sound Green Tour
Innovation – Education – Inspiration

April 17th and 18th, 2010

A community event to celebrate green innovations through education in sustainable building and inspired living.
This year’s tour will showcase the greenest homes and buildings in our area that incorporate significant use of solar or other renewable energies, new and reclaimed materials, low energy consumption and water conservation technologies, and sustainable design techniques.
Educational sessions will be held at various locations and feature real life topics on how to build and live greener. See our website for more details – www.SouthSoundGreenTour.com The site will be running by January 1, 2010

The Cooper project that we have been building will be one of many homes and businesses that will be open to the public for the weekend. Mark your calenders and join us, it should be a great time

The Northwest Eco Building Guild is an alliance of builders, designers, suppliers, homeowners, and partners concerned with ecological building in the Pacific Northwest.

A vital organization, our mission is to provide leadership in education to transform the built environment and build a sustainable society.

It’s important that you install LED’s correctly

Cory — Wed, 02 Dec 2009 08:13:21 +0000

There’s quite a fraction of people reading this series on LED lighting who will nod their heads in disagreement. You’ve probably heard from your friend’s that they are very-expensive, very-chic, or that LED installations go bonkers after a few months. The problem is not with LED. LED is one of the best lighting options for residences, when used correctly. An inexperienced electrician and incorrect buying decisions can do a lot of harm to the lighting of the house, to you and your pocket. Here’s what to bear in mind:
1. Buy the right type of LED for your requirements. There are low wattage LEDs, which will work on 1mA (very little) of electricity and there are also new High-Power, high wattage LED which will work on more than 1A (100+ mA) and produce over 1000 lumens. The low wattage ones are used singularly to create different effects, usually for decorative purposes. The high wattage ones are used in place of a light bulb, or used in an array to provide enough light for an entire room.
2. Both types of LED lighting have different requirements. Low wattage LEDs burn out very quickly if not used with the right kind of voltage. They require much less than what is available by default in homes. High wattage ones, on the other hand can work with what we have in homes but need adequate heat sinks that will absorb the extra heat they will produce. If heat sinks are damaged, the lighting will burn out in seconds.
3. LEDs are quite affected by ambient room temperature. Installing them into walls which are not properly ventilated or in rooms that tend to get warm affects their life expectancy, causing them to fade out faster.

LED’s for residential lighting

Cory — Tue, 24 Nov 2009 02:52:14 +0000

If you’ve been to a house that was recently done up (in a rather fashionable manner) – you might have found a lot of small whitish lights used in places where the conventional bulbs and CFLs used to be. These tiny things are LED (Light Emitting Diodes) a new entrant in the field of home lighting.
LED is a certain type of lighting device which is being increasing used in homes for many reasons. Largely, they are used more for decorative purposes, but their efficiency and long-life as compared to other fluorescent and incandescent lamps have led to LED using lamps to be used as the main source of light in a house.
The main factor working in LED’s favour is its efficiency. Unlike regular bulbs and fluorescent lights, which waste almost 90% of the energy they consume in the form of heat, LED release very little heat, using up most of the energy to produce light. Thus, its input/output ratio is quite high, and typically LED’s last about 20,000 to 35,000 light hours (compared to CFLs which last 15,000-20,000 hours and incandescent bulbs which last about 1000-2000 hours). This makes them an extremely cost-effective option, when compared to other forms of lighting.
To add to this, LED is available in a variety of colours and can be used very effectively for home decor. Also, LED is a point source of light. Which means if LED lighting is recessed into a wall, all the light it emits will go straight ahead into the room? When incandescent bulbs are recessed, only a fraction of the light will actually make it into the room.

Using Structural Insulated Panels (SIP’s)

Cory — Thu, 12 Nov 2009 01:48:18 +0000

Although not new, structural insulated panels (SIP) have recently garnered more attention than ever, thanks to the builders’, manufacturers’ and homeowners’ interest in green building and energy efficiency. With a view to energy efficiency, SIP is a good option. If you’ve ever been involved with any kind of construction in any way, you will notice that builders often use what look like large boards in place of conventional stick frames. Essentially, they’re replacing traditional house envelopes with SIP – and the best part about SIPs is that they can be used in place of any building material. SIPs are used in place of exterior walls, roofing material, floor boards and insulating the foundation.
The most obvious benefit of SIPs is that they have excellent insulating properties. A house built with one of the first ‘versions’ of SIPs in 1937 is still standing, after years of withstanding Wisconsin’s severe climate. The house was dedicated by then First Lady Eleanor Roosevelt and is currently used as a day care centre by the University of Wisconsin. Since then, SIPs have gone through many changes. The SIPs today play a significant role in reducing a house’s energy consumption requirements – particularly heating requirements, are quite low on maintenance and high on durability leading to lower operating costs and are easier and more efficient to construct. The only possible drawback that we might consider is their suitability over the long term in Northwest wet weather.

Is Passive House construction worth it?

Cory — Fri, 16 Oct 2009 08:22:10 +0000

Quite frankly, it is not to much effort. Building technology has developed to a great extent since the passivhaus standard came into existence, and it is quite a bit easier to build a passive house now than it was 10 years ago. Most of the building material that you require are easily available. Passive houses are as comfortable to live in as any other homes and in fact are healthier and safer because of the building design.

Passive houses are more expensive to build than conventional homes because of the materials required between five and ten percent depending on size. However, over the long run, they have proven to be much cheaper. When you look at how much a conventional home costs in terms of heating, cooling, ventilating, electricity, and air conditioning – a passive house turns out to be a cheaper bargain.

Passive homes are not that uncommon either. Although it is difficult to find a completely passive house in the US – they’re common in the UK and across Europe. Closer to home, we have green homes that make use of some of the principles of passivhaus and add their own two bits to create an energy efficient green home. In Washington DC, we have architect and green builder Travis Price’s four story green home, just about 10 minutes from the White House. His house was featured on the Discovery channel’s World’s Greenest Homes – which, by the way, is a great show to see how much and how easily people can build green homes for themselves.

How do you build a Passive house? Part II

Cory — Tue, 13 Oct 2009 08:18:15 +0000

4. Ventilation: Ventilation is properly controlled in a passive house, by means of a mechanical heat recovery ventilator. Although HRV are used in most houses, passive homes use an extremely efficient one, since no other heating or cooling device is used in the house. Most passive houses use both – air to air and earth to air heat recovery systems – depending in the size of the house and climate.

5. Air-tightness: Air-tightness is an extension of the ventilation requirements. Passive houses don’t make use of any HVAC systems – only a HRV system. Thus, it becomes very important that air doesn’t pass through the house in any other way, otherwise, the HRV systems will not be able to perform optimally. Passive houses are therefore super air-tight, much more than conventional houses. The building envelope is sealed thoroughly, and so are any service components that go through it.

6. Space Heating: This is a pretty novel concept in the passivhaus technique. When all the previous measures are not enough to heat a particular house, passive houses use heat generated within the house due to electrical appliances, lights, human beings and animals to heat it. Other than this, some houses install a small or heating device (running on renewable energy) that is integrated with the ventilation system. Some houses also use a micro heat pump that can recover heat from the air escaping through the ventilation system. Together, all these ideas make a conventional heating system quite unnecessary.

7. Electrical Appliances: Passive house use low wattage electrical appliances, CFLs and intelligent installation to minimize the use of electricity.