Green Terms Defined: Air Changes per Hour

Green Terms Defined: Air Changes per Hour

Green Terms Defined: Air Changes per Hour

Air Changes per Hour (ACH) is the measure how many times the air within a defined space is replaced. This measure is determined by how the house / building allows for air to be pulled in or pushed out. It is important to have the right ACH to keep the indoor-air-quality healthy and your energy bills low.

IR_0039

There are many places for air leakage that negatively impacts the right ACH for a home / building. The key is to stop the unwanted leaks from happening and only use the designed ventilation system for air changes. The goal is to make the home / building as air tight as possible rather than allowing it to “not be too tight.” This approach allows you to protect indoor-air-quality, reduce energy bills, and maintain the right ACH for your particular space.

The only way to determine your ACH is through using a blower door test. The 2012 building code that is used in Virginia has a requirement to measure the ACH for both commercial and residential construction. In Virginia, you can do a visual air leakage test for residential construction (this is not possible), but for commercial you have to do the blower door test on all new construction.

Green Term Defined: Weatherization

Green Term Defined: Weatherization

Weatherization is the practice of using cost-effective strategies to modify a building to decrease energy usage and increase comfort. The broad approach of weatherization includes building envelope improvements, heating and cooling system strategies, electrical systems modification, and appliance upgrades.

Indoor air quality

The benefits of weatherization start with reducing monthly energy bills. From air sealing to insulation, strategies used in weatherization will benefit energy usage and comfort in the building for many years.

Bathroom renovation

Strategies to consider:

Air Sealing

Insulation

Water Conservation

Energy Efficient Lights

Other Tips

Things to do this Spring around your home: Step 1 assessment

Spring is a great time to do an assessment of your home. This will provide you with a priority list of things to get done before next winter to help create the most healthy, energy-efficient, and durable home possible.

erosion

1. Water Management

  • Check your roofing for damage – repair or replace as needed
  • Check your gutter for proper slope and drainage
  • verify your rain tanks or splash blocks are still in place and functional
  • Check that your windows are in good shape
  • Verify that the ground is sloped away from the foundation of your home
  • Look for evidence of roof leaks inside your home and attic
  • Look for evidence of water on basement walls
  • Check all plumbing fixtures for leaks and drips

20140612_181803_1

2. Landscaping

  • Prune any dead branches on trees and bushes
  • Plan your garden – add fertilizer and straw to keep out weeds and to grow strong plants
  • sharpen your blades on your mower

3. Durability

  • Document any new (or old unattended) cracks in your walls
  • Document pealing paint that needs your attention
  • Check to make sure the shutters are in good shape and fastened tightly to you home

attic insulation

4. Energy Efficiency

insulation

5. Indoor Air Quality

It is not a full list, but simply a list of things that I hope will help you before the hot weather gets here or the cold weather returns.

Things to do this Spring around your home: Step 1 assessment

Things to do this Spring around your home: Step 1 assessment

Spring is a great time to do an assessment of your home. This will provide you with a priority list of things to get done before next winter to help create the most healthy, energy-efficient, and durable home possible.

1. Water Management

  • Check your roofing for damage – repair or replace as needed
  • Check your gutter for proper slope and drainage
  • verify your rain tanks or splash blocks are still in place and functional
  • Check that your windows are in good shape
  • Verify that the ground is sloped away from the foundation of your home
  • Look for evidence of roof leaks inside your home and attic
  • Look for evidence of water on basement walls
  • Check all plumbing fixtures for leaks and drips

2. Landscaping

  • Prune any dead branches on trees and bushes
  • Plan your garden – add fertilizer and straw to keep out weeds and to grow strong plants
  • sharpen your blades on your mower

3. Durability

  • Document any new (or old unattended) cracks in your walls
  • Document pealing paint that needs your attention
  • Check to make sure the shutters are in good shape and fastened tightly to you home

4. Energy Efficiency

5. Indoor Air Quality

It is not a full list, but simply a list of things that I hope will help you before the hot weather gets here or the cold weather returns.

5 keys to measure “good” architectural design

5 keys to measure “good” architectural design

Architectural design is a highly subjective art. While there are works of architecture that are considered by many to be “good” architecture they will not appeal to everyone. So how do you know if your architectural creation is “good” architecture? Is it an aesthetic opinion? Is budget the primary concern? Is function the driving factor? All of these should be considered when creating a structure that will last for many years, impact user experience, and shape a community.

Here are 5 keys that I use to measure “good” architectural design:

IR_0039

1. What is the environmental impact of the building? It is easy to design a building that focuses on energy-efficiency, indoor-air-quality, water conservation, resource depletion, and resilience, but you must have an architect that understands it. Don’t settle for “because that is the way we always do it” old school design solution. Ask your architect if they will incorporate building science into the solution for your dream home.

2. Does design provide more than the client asked for from the architect? As an architect, we spend years understanding space planning, function, performance, quality, and how to translate future needs of clients. We try to incorporate things into the design that the client does not know to ask for when they describe their dream home. A highly functional kitchen, space for the right furniture, the perfect views framed from the perfect place to sit inside the home are all things you should get in the design of your dream home to be “good” architecture.

IMG_4007

3. Is it timeless? Designing a home that is timeless takes careful attention to style, but also durability of materials and flexibility of spaces. Design for a lifetime means that the home can adapt not only in style but also as the homeowners needs change, kids move out (or back in), and as technology changes over time. Remember those orange kitchen counters and pink tiles in bathrooms that were popular years ago – fads look very dated when they are used in architecture.

4. Does it provide delight and pleasure to the users of the space? Aesthetics, of course, are important and that has a lot to do with bringing delight and pleasure to the users. However, the quality of the space is also important. Does the space have appropriate natural light, is it comfortable, are the materials pleasing? These all impact the user experience and should be considered by your architect when creating “good” architecture.

Chewning 016

5. Does it provide value? Every home owner has a budget. Sometimes they share the real budget, sometimes they share a wishful budget, and sometimes they don’t share any budget with their architect at all. In any one of these approaches by the client it is the architect’s ethical duty to offer the design solutions that gives the best value (this does not mean the lowest price) for the client. Offering solutions that are durable, energy-efficient, and healthy are obvious approaches to value design. The architect should also understand the materials being used. They should know how to design using the right lengths, widths, and spans that offer high performance for the best price. The architect should find solutions that are not required to be special order items, solutions that local builders know how to assemble, and solutions that do not require too high of a level of precision to achieve the desired solution.

Telling your architect these ideas are important to you will give them direction as to what you want in your dream home. Picking an architect that offers these solutions without you asking is a good first step to a successful design process and “good” architecture.

Should my new house “breathe?”

Should my new house “breathe?”

Ask any seasoned carpenter (that does not understand building science) and they are likely to tell you “don’t build too tight, you want your house to breathe.” This is a tried and true because-that-is-the-way-we’ve-always-done-it example.

IR_0039

Early in the construction industry you did not build a home air-tight so that the walls could dry out. This is a leftover from days before we insulated or conditioned a home and wanted to air them out to keep them healthy inside.

DSC00967

However, now we have added insulation into our walls to increase energy performance.

Now we have heating, cooling, and ventilation systems to control indoor-air-quality and make the house comfortable and healthy.

DSC07760

So if your builder tells you they have done anything less than make your home as air tight as an igloo cooler, ask them if they will help pay your monthly electric bills. Ask them if they will come and dust your home once a week. Ask them why they continue to build as if the house is not insulated or conditioned.

energy audit

 

 

 

 

Making your home air tight is key to a healthy, energy-efficient, and durable solution. Of course you do need a heating and cooling system that includes ventilation. This is how you bring fresh air into the house – through a filter – using an energy recovery ventilator. Making your home air tight filters the air reducing the need to dust. It also reduces energy consumption. It also filters the air improving indoor air quality. Making it air tight includes sealing every connection, joint, vent, penetration, window, door, roof, and hole.

 

Triple C Camp - NEST Rebuild, 2010