AE Building Systems Archives - AE Building Systems

Energy-Minded Design: The Balance Between Form & Function

There are some pretty snazzy design ideas out there in the world. If you look at design contests, architectural school projects, or even just down your own street, you’ll probably see some very beautiful designs that simply don’t make a lot of practical sense. It comes back to the age-old question of form vs. function. Designers have been walking that delicate balance for thousands upon thousands of years, and in today’s world, it’s no different. Simply put: certain design attributes cause complexity with energy efficiency and force project owners to make hard decisions.

Complex Design Attributes: There are a handful of common design attributes that simply add complexity to the energy efficiency of a house. For someone designing a Passivhaus building, or just wants to be energy-aware, the question usually comes up and you have to decide between bump-outs that make the energy model more challenging and something that will help prevent energy loss.
Design Features: Bump-outs, cantilevered floors, dormers, knee walls, and more are some of the common culprits. Often, these are poorly insulated and add extra exterior wall surface area and seams in a wall or roof construction. All of these factors lead to energy losses due to air infiltration and thermal bridges.

Conditioned Breezeways: Breezeways that are conditioned, heated, and cooled, are another common culprit for energy loss. While these are great for connecting parts of a home, they often have multiple exterior facades, increasing the potential for thermal inefficiency. The surface area to volume ratio is much higher in a breezeway than typically is found in the primary parts of a home.

Poor Orientation: Orientation of a home is often the last consideration, but especially in sunny climates like Colorado, the way a home faces the sun can make a big difference. Whether you’re dealing with a room overheating or a spot in the home being too cold from lack of direct light (and heat) from the sun, it can make a difference.

How to Design Well, But Efficiently
Simple is Better: Every time you add a turn, an opening, or additional surface area to the exterior, you increase the potential for energy losses while increasing the complexity of how you will maintain thermal integrity at that juncture. Simplicity allows for higher performance than highly complex building envelopes!

Orient Well: Take note of the orientation from the start. You’ll want to consider your views as well, but keep in mind which side of the home will get the most sunlight and daytime heat. Also, think through where the windows will be positioned in relation to this orientation. It makes a big difference in states like Colorado where the sunlight can cause huge temperature swings for some spaces.

Materials Matter: If your overall exterior facades are fairly simple, you can still add some elements of great design and interest with the placement of unique finish materials and colors. Breaking up a facade with a few materials and complementary color schemes can add interest without causing extra energy losses. In fact, you can even incorporate these design material choices in a way that supports extra insulation (e.g. continuous insulation). Finish and insulation material selections can help protect a home even more from the harsh sun, wind, or outside temperatures.
Purposeful Corners: If you are adding complexity to your design with additional corners and bump-outs, make sure you are designing those weak points with intention. Proper design and use of materials to seal off and improve the thermal performance of these junctures is vital!

Exterior Living Spaces: Consider how exterior living spaces like porches, pergolas, and covered patios can allow depth and great design, while strategically protecting the home from energy losses.

Are we saying your house needs to look boring to be energy-efficient? Absolutely not! Some of the most efficient, sustainable homes we’ve encountered are true works of art. However, an energy-efficient home doesn’t happen by accident. It must be a continual conversation between you, your architect, and your contractor to ensure any and all goals on the project are met.

As you consider these energy-efficient options for your home, make sure to keep our team involved in the process. We often help our clients find the balance between form and function so that your home is truly the energy-efficient work of art you’ve always dreamed of!

Collins Residence Part II

Last month, we took you on a behind-the-scenes peek at the Collins-Ruddy project. This tri-level home was a retrofit from a 1970’s where energy-efficiency was clearly not in the original blueprint of the home. Todd and his family began a journey to improve the energy loss in their home, and incorporate Passive Haus techniques wherever possible.

We use the word “journey” because that’s truly what it has been. They started this project in 2012 and are still to this day finding ways to improve. If you’re just catching this journey here in this article, take a look back at the first half of the journey we shared last month.

Today, we want to share more details about this project:

Biggest Lessons Learned:

Solar: Todd wishes he had installed more solar panels than he needed originally to account for these future needs. While they maxed out the federal incentive, as it stands, they will need to upgrade their solar system to get them to Net Zero with vehicles, equipment they have, and what they plan to have in the next several years.

Entry Doors & Floors: The doors were installed prior to considering a wood floor upgrade. Because the doors were installed lower, standard wood floors were no longer possible or the door would not be able to open. Instead, Todd installed engineered flooring which is not as thick.

Attic Insulation: Todd says if he had to do it over, he would have started from scratch. Clear out the old insulation, then start with a thick layer of foam at the attic perimeter and wall connections, foam the j-boxes and any other penetrations… and then finish with a huge layer of blown cellulose. It’s more costly to do it this way, but it’s also more effective for a couple of reasons: higher r-value at the perimeter and is more airtight.

Win the Lottery: While a pipe dream, Todd jokes that he would have won the lottery before approaching this project. It sure would have made the process easier! The process can get pricey with the more costly upgrades like windows and solar panels.

What’s Still to Come?

Remember we mentioned that this is a journey? That said, between budgets, finding quality labor/contractors, sourcing supplies, and just mere time, retrofitting a house to be more energy-efficient usually doesn’t happen overnight.

Here are a few projects they plan to tackle in the future:

Remove the siding, add an air barrier and then 3” of mineral wool continuous insulation, and finish the exterior with new siding.
We might consider re-insulating our walls at some point as there is only poorly installed batt insulation. The re-insulation process entails cutting holes and filling the walls with cellulose.
Purchase a new heat-pump water heater.
Replace the furnace with a whole house heat pump when it approaches end of life.
Increase solar panels to get to Net Zero.
Go all electric and cut the gas.
Go all electric for our cars as well … and utilize our solar energy production to charge them. While we have started this process with a RAV4 prime – plug-in hybrid, future vehicles will eventually be all electric.

Here’s the new video >>

Why Do All This?

Sometimes they get quizzical looks from neighbors and friends as they share about their journey and projects. Why would you invest so much effort into improving so many things that you will never see? Sure, there are fun things like a kitchen remodel that you see and experience day in and day out that make a difference. Initially, it was about their children sleeping through the night and it’s pretty easy to forget the fact that you don’t have to cover your feet on freezing floors or the fact that you can live without space heaters in the dead of winter. Finally, Todd has the peace of mind that energy price increases won’t be that impactful on his bill.

Their family knows the power of energy-efficiency and how it can not only save a lot of money in the long run, but it reduces the need to rely on creating more heating or cooling. They’re proud supporters of sustainability efforts that reduce their carbon footprint and energy load on the earth. If we can build a better space that asks less from our energy resources on earth, why shouldn’t we? That’s their approach.

At AE Building Systems, we want you to know that you don’t have to be breaking ground on a brand new custom build to employ energy-efficiency into your home. Odds are, most of us reading this have purchased a home where we inherited energy-efficiency issues, thermal bridging, and other concerns in a pre-owned home. Most of us will be where Todd and his family were: faced with retrofitting and solving problems as best we can with the house we’re in.

We want you to know you CAN make a difference in your own home. Small steps can make a BIG difference when it comes to energy-efficiency, energy savings, cost savings, and sustainability efforts. You can be part of it, and we want to help you on your own journey.

Got questions for Todd or want to know where to start? Feel free to reach out!

Todd Collins 720.287.4290

Thermal Bridging and Issues with Windows

As a homeowner, heat loss is or should be a big concern. Energy escaping through the building envelope (walls, roof, floor) means more energy is required to maintain a consistent temperature or better said – comfort -within your home. It also means higher utility bills whether you’re building a new home or looking to refurbish an existing home. One of the most significant considerations should be how to make your home more comfortable but also more energy-efficient – less costly to operate. Which leads us to the topic of Thermal Bridging!

What is thermal bridging?

In a heating climate and similar to air infiltration, thermal bridging results in heat loss and occurs when heat escapes from the inside of the building to the outside, via conduction and through the building envelope. If you’ve ever been in a house that has a “drafty” spot or just constantly feels cold, that’s likely the result of thermal bridging as much as or even more than air infiltration. Even airtight homes can have a heat-losses of 20 to 50 percent due to thermal bridges.

Types of Thermal Bridges

There are several types of thermal bridges that designers, builders, and homeowners should be aware of and the following are three common types:

Repeating or Systematic thermal bridges: A common cause of heat loss are repeating thermal bridges which are predictably found inconsistent breaks in the thermal envelope allowing heat to pass through easily. It’s important to keep these in mind during a building’s design. Common Examples include wood and steel studs, steel wall ties, ceiling joists, and insulated suspended floor joists.
Non-repeating thermal bridges: This method of heat loss doesn’t follow a pattern in the way that repeating thermal bridges do. A non-repeating thermal bridge tends to pop up in specific areas impacted by an interruption or break in the construction. Common culprits include things that penetrate the thermal envelope to include windows and doors, structural beams, pipes and cables, and cantilevers.
Geometrical Thermal bridges: Generally found where the building envelope changes directions and where the materials meet, Geometric thermal bridge examples include wall corners, wall to roof and floor junctions. The more complex a building design is, the more geometric thermal bridging will be prevalent.

Regardless of the source, avoiding thermal bridges wherever possible is essential – and knowing where your home is losing heat can help you take the proper measures needed to reduce the problem.

Thermal Bridging and Windows

Often, it is windows that are a major culprit when it comes to heat loss and thermal bridging in the home. Standard or code minimum windows often represent a compromise. “We” accept their lower thermal performance because we enjoy the view, natural light, and ventilation they provide. However, when adding high-performance windows with higher R-values (lower U-values), windows become less of a concern for thermal bridging, especially when properly installed.

In an existing home, an expert can determine the state of a home’s windows by doing an inspection. They know what to look for in terms of damage, deterioration, and condition. Knowing a window’s age is a big help as well. Most older windows did not have high-performance glazing nor did manufacturers generally consider thermal bridging in the frames and spacers.

With new construction or existing homes, to reach your energy and comfort goals, it is important to consider high-performance windows. The thermal image below shows the thermal bridging – shown in blue/purple. This is likely why you have seen condensation on windows.

This image below shows the thermal bridging – shown in blue/purple. — The magic of thermal imaging!

Note also high-performance windows help with other variables to include sound attenuation. They reduce the sound coming from the busy street in front of your house for example.

Thermal Bridging Results in Condensation – and Mold

Four variables come into play with condensation: outdoor temperature, indoor temperature, your home’s humidity level, and the indoor surface temperature of an exterior building envelope component. Since outdoor temperatures are not something we have control over, we focus on what is in our control. Windows that have well-insulated frames, multi-panes of gas-filled glass and have higher performance spacers will help increase the interior surface temperature of the windows. Higher interior surface temperatures help to effectively prevent the condensation of moisture on your windows preventing mold from growing. This subsequently improves your air quality. We would be remiss if we didn’t also mention the importance of ventilation systems which improves indoor air quality.

Check out this SIGA Fentrim F for preventing condensation

How To Prevent Window Thermal Bridging

Glass: Pursue options that included triple or even quad glazing.
Gas: Gas filled glazing is no joke. Argon gas is cost effective and provides a good boost in performance over air-filled units. Krypton gas, while more costly, provides an excellent increase to performance.
Frames: Select frames made of low conductive materials. Aluminum frames without thermal breaks are a complete no-no for energy efficiency and comfort. Aluminum is a tremendous conductor of heat. Better options are wood, fiberglass, and PVC with insulating air chambers. These frames are even better if they are insulated. Note, thermally broken aluminum is a good option depending on how good the thermal break is.
Spacers: Selecting windows with better spacers can help prevent thermal bridging in the windows as well. These spacers separate the panes of glass and appear where there are divided lights. Avoiding spacers made of aluminum and steel, and selecting stainless steel and various composite materials are much better options. Warm Edge, Super Spacer, and Swiss Spacer are some of the composite spacers that are available.
Installation: Proper window installation including air sealing and insulation around the windows will significantly reduce the amount of energy loss. To reduce thermal bridging around windows, Thermal Buck is a great product for the installation.

Final Thoughts

Bringing awareness of thermal bridging to all of your construction partners will aid in your goal. An architect can design to minimize thermal bridges. By not paying attention to the details on the construction site or if there is a lack of training, reaching your goals will be difficult.

If you’re looking for ways to minimize thermal bridges and select high-performance windows for your project, contact us today.

What Are Construction Thermal Bridges in Buildings?

Do you have a random “cold spot” in your dining room or perhaps in an area where a sweater is always needed, no matter how high the thermostat is set? Thermal bridges may be at play.

If you don’t work in or around construction, you may have never heard the term “thermal bridging”–but you’ve likely felt its effects. In a nutshell, it’s the movement of heat across an object that is more conductive than the materials around it.

Thermal bridging not only causes a loss of heat within the space, it can also cause the warm air inside to cool down. As we approach the coldest season of the year, this means higher utility costs and potentially uncomfortable shifts in temperature inside your home or building.

Keep reading to find out exactly how thermal bridging works and what you can do to stop it:

What is thermal bridging?

When heat attempts to escape a room, it follows the path of least resistance. Likewise, the same process occurs during the summer, only in reverse, allowing heat to enter your otherwise cool building.

Thermal bridging happens when a more conductive material allows an easy pathway for heat flow–usually where there is a break in (or penetration of) the insulation. Some common locations include:

The junctions between the wall and the floor, roof, or doors and windows.
The junction between the building and the deck or patio
Penetrations in the building envelope to include pipes or cables
Wood, steel, or concrete envelope components such as foundations, studs, and joists
Recessed lighting
Window and door frames
Areas with gaps in insulation

Impacts and risks assumed due to thermal bridging

What does all of this mean for you? In addition to poor climate control, there are several other lesser-known (but still serious) effects caused by thermal bridging.

Thermal bridges can increase the risk of condensation on internal surfaces, and also cause condensation within the walls. Both can lead to mold growth, which in turn can cause unpleasant odors, poor air quality, and most importantly long-term health problems. Additionally, unchecked condensation may eventually cause rot and structural damage.

Thermal Bridging in windows

Thermal bridging can have a significant effect on the energy efficiency of windows. The frames and spacers are the primary culprits. Spacers are the, typically metal, “strip” that goes between and separates the glass on double and triple pane windows. Different materials have different conductivity and impact the performance of the windows differently. Condensation on a double pane window is generally due to the spacers.

With retrofit situations, knowing exactly how old a window is, as well as the component materials, can provide you with a general idea of its efficacy. Unfortunately, if your windows are rather dated or just poorly made, it is nearly impossible to add thermal breaks into an existing framing system.

Issues with roofs and foundations

By their very nature, roofs and foundations present a large number of challenges in terms of maintaining a thermal boundary. Drains, vents, and holes for pipes and wires (amongst other things) create unavoidable penetrations in the building envelope and insulation. Heat transfers from the building into the ground or from the building into the air are often inevitable, though they can be minimized.

Strategies and methods to reduce thermal bridges in buildings

Bottom line? In new construction, design it right which a whole topic in itself. With existing homes, if you suspect there is thermal bridging occurring in your space, you need to eliminate or reduce the effects as much as possible.

Proper planning, design, and construction can help remedy thermal bridges in new structures. However, if you live in an older home, there are still steps you could take. These strategies include:

Performing an energy audit to identify thermal bridges in your home
Installing double or triple pane windows with argon or krypton gas, better spacers and insulated frames
Updating and/or adding insulation to your home – ideally adding a continuous insulation layer.
Installing storm doors (especially if you have metal doors)
The ultimate remedy is to complete a deep energy retrofit that addresses everything and more than mentioned in this blog

Studies show that in an otherwise airtight and insulated home, thermal bridges can account for a heat loss of up to 30%. Whether you’re building a new home or retrofitting an existing structure, care should be taken to avoid unnecessary breaks or penetrations so that the possibility of thermal bridging decreases.

If you’re looking for ways to minimize thermal bridges in your next project or existing home, contact us today.

Fresh Air Ventilation & Monitoring

Fresh air is a commodity that everyone needs and wants. Who doesn’t like to breathe fresh air? Generally, the best source of fresh air is the outdoors. But since most of us don’t live outside, we can still supply fresh air to our homes by opening windows and doors. However, we all know it’s neither cost-efficient nor wise to leave our windows and doors open during the cold winter or hot summer.

Many older homes are leaky enough that fresh air enters through all tiny cracks and holes in the walls and around the windows and doors. With high-performance homes, the foundation is to build it air-tight and add ventilation. The catch phrase is, “build it tight and ventilate right.” But how exactly do we “ventilate right” in an airtight home when our objective is to keep cold air out in the winter and cool air in in the summer?

We must mechanically bring in fresh air. The Build Equinox CERV system does just that. The CERV recirculates air, brings fresh air in and removes stale air while offering both heat recovery and air filtration. Put simply, the CERV makes sure you have fresh, filtered air and keeps heat where it belongs, in or out based on the setting on the unit.

Designed with sensors to detect VOCs (Volatile Organic Compounds) and CO2, the CERV will “smell” the air and put itself into circulation or ventilation mode appropriately based on the sensor readings. The VOC and CO2 levels drive the demand of the unit based on the thresholds the owner programs on the unit.

A CERV returns air from rooms such as the baths, the kitchen and possibly other rooms that might have more “smells” or humidity such as workout rooms, laundry rooms, etc. It brings that air back to the unit to either simply filter/recirculate it or to replace it with fresh air from outdoors while exchanging the heat that is in the air. In the winter, it keeps heat in and in the summer it reverses the process and keep heat out of the building.

One of the more unique features of the CERV is that it uses a heat-pump to move heat to the incoming or exiting air stream. While it is not meant as a primary source of heating or cooling, the CERV actually provides a small amount of heating or cooling capacity.

Components of the CERV System:

Heat-Pump Module (A)
Module A of the unit heats, cools, dehumidifies and exchanges energy between incoming incoming(fresh) and exiting(stale) air streams, with no low temperature operation restriction. Most H/ERV’s require some kind of anti-freeze function or capability. This is not necessary with the CERV.

Fresh Air Control Module (B)
Module B of the CERV houses the electronics, integrated pollutant sensors (CO2, VOC, temperature and humidity) and damper, and this is where the CERV intelligently monitors air quality and activates fresh air ventilation. When fresh air is not needed, recirculation adds heating/cooling to unify comfort and indoor air quality. Also, the Fresh Air Control Module is fully insulated with no thermal bridges. It has a very user-friendly color touch screen controller with large print, easy to navigate control and status screens. The controller can also be placed anywhere in the house. In addition, it has an option to connect to the Internet, through the CERV-ICE Online Gateway, making it possible to control the system directly from a smart phone, tablet or computer.

Inline ECM Supply & Exhaust Fans

These are variable-speed ECM fans which balance air flow efficiently, supplying fresh air to the occupants and exhausting polluted air from house.

Inline Filter Boxes
These boxes remove air contaminants from incoming air to the home and are placed where fresh air enters. The CERV uses common filter sizes which can be purchased from several sources.

An important fact to consider in fresh air ventilation is the natural atmosphere CO2 (carbon dioxide) level of outdoor fresh air is 400 ppm (parts per million CO2). At more than 900ppm, a person’s mental performance, sleep quality, and productivity decreases. Currently, the indoor air quality ASHRAE standard for newly constructed homes is 1100ppm! If that is the standard, then we can clearly see why our air quality is a problem (source: https://ehp.niehs.nih.gov/1104789/). The good news is the current average indoor air quality level for homes in the CERV community is 686ppm.

Also note that some homes integrate various accessories that accomplish various objectives. For example, booster switches can be added to bathrooms and kitchens to help evacuate humidity and pollutants from those spaces. In addition, there are accessories that either help to pre-condition the air as it comes into the CERV from outside or to heat the air after it leaves the CERV. Please contact us for more information on these accessories.

In summary, as part of the high-performance home or any home for that matter, the Build Equinox CERV system makes good sense:

Fresh, clean air for the family
Recovers heat/doesn’t lose it
Provides health benefits of reduced CO2 levels (improved brain function, sleep quality and productivity), lowered pollutant/contaminant levels of things we bring into our home (i.e. off-gassing of new items we purchase, paint fumes, as well as pollutants created within the home, such as cooking odors, bathroom and laundry room odors or pet odors).

If fresher, cleaner air in our homes is the goal, then a Build Equinox CERV home makes next-to-outdoor fresh air in a home quite achievable.

For more information about the Build Equinox CERV, call us at 720.287.4290 or visit our website https://aebuildingsystems.com/product/build-equinox-cerv/.

Source: buildequinox.com