After months of careful planning with my architect, the building inspector and other members of my team, we’re picking up the pace of the construction phase of my eco-friendly homebuilding project.
I’ve completed a large portion of the framing process and construction of my building envelope. There are a lot of details that I am paying attention to that are often missed in ordinary construction techniques - the foundation has been insulated with 2 inches of XPS rigid insulation on the exterior side, and 2 inches of rigid insulation on the inside. XPS insulation doesn’t absorb moisture and is a good choice for ground-level insulation. I also surrounded the entire concrete foundation with a layer of waterproofing to keep moisture out and maintain optimal control of the structure’s indoor temperature and comfort level.
Since I live in a colder part of the country, it’s super important for me to pay attention to these details. A 10-inch thick poured concrete foundation is considered “R-1” - that is, a 10-inch thick wall of concrete holds the same heat flow resistance as a single pane of glass. Many people think that just because concrete is thick and solid that it will keep their home warm and toasty during the wintertime. However, concrete is very porous and heat is easily able to escape. So in order to increase the R value of my foundation, I am placing layers of insulation inside and out.
My career in the comfort industry has brought me the good fortune of being able to meet a number of professionals that specialize in renewable energy. I know that as I continue on in the construction process for my new home, I still have a number of decisions to make when it comes to what mechanical systems I will end up installing, and what renewable energy options are available to me.
During my trip to the AHR Expo in Orlando, Florida in January, I had the pleasure of talking to Jay Egg, one of the foremost experts in geothermal heating and cooling. Jay is a consultant and designer of geothermal HVAC systems and has been working in the field for over 25 years. Our conversation provided me with valuable information about how geothermal heating and cooling works, and the benefits of having a system installed.
I’ve found that trade shows like the AHR expo are a great place for people like Jay and I to meet and enjoy conversations together about topics that concern all of us across the comfort industry.
I know know that when my new eco-friendly home is finished, the finished structure will have a HERS rating of 5 if everything goes according to plan. With 100 representing the least energy efficient home possible and the number zero representing the most energy efficient structures, my home will be very close to net zero.
As you know by now, my plan for a tight building envelope is a big part of what is going to make this possible. Since I plan to control the flow of air into and out of my new home with multiple layers of high R value insulation, installing the right HVAC mechanical components and systems is critical to maintaining indoor comfort.
The benefits of using eco-friendly building materials in a project are numerous and include reduced maintenance costs, conserving energy, and greater flexibility when it comes to designing your home.
For this project, I have taken a systemic approach to implementing an eco-friendly design, but it all started with selecting quality building materials at the very outset of my project. For example, when we cleared a portion of our 2.2-acre parcel to build the structure, I decided to use the forest topsoil for my lawn once the home is complete rather than have landscapers truck in new dirt to my property. That decision shaved down my carbon footprint somewhat and inspired me to select recycled, locally available materials whenever it makes sense.
Some people will build their project around decisions like this and select salvaged, refurbished or reusable materials whenever possible, but for this project I've done my best to have my cake and eat it too. A comfortable indoor living space is absolutely necessary for my wife and I, and so is sustainability. Therefore, when I select building materials I have to keep these two criteria at the forefront of every decision I make.
Where do you draw the line when selecting building materials for your project? What do you think of my approach? Join the conversation and let us know!
I’ve found through my years of homebuilding experiences that the professionals I work with on a project frequently operate in “silos”, or autonomously from one another. While I may have a lot of one on one interaction with each specialist, it’s generally uncommon for the people I work with to get a chance to interact with each other during the course of a project.
As progress continues on the construction of this eco-friendly home that may very well become our retirement home, I’ve put my decades of homebuilding experience to work. I envisioned this project being one where the professionals I work with see a lot of interaction with one another. Accomplishing this is not always an easy task - foundation contractors, architects, and engineers are usually very busy people and most don’t really have the opportunity to do much more than build off of the work the previous professionals did on a project.
I’ve learned that the more interaction the professionals I work with have with each other, the more these experts whose help I enlist begin to look like a team. It also helps that I am not a novice when it comes to building homes, so I have a great deal to talk with them about. I definitely think that this level of communication will yield a superior product in the end, the home my wife and I will move into at the conclusion of the project.
I know it might sound cliché, but I believe that the foundation of a new home is the cornerstone to a project's success. The reasons for this are fairly straightforward - I've seen projects where a foundation is poured incorrectly and cracks form in the cement over time, which opens up places where air can escape and enter. Since I intend to make my building envelope as tight as possible to control the conditions inside of my home, it’s important that the foundation is solid and well-poured.
One other misconception about foundations that many people don’t think about is the porous nature of foundation concrete. It’s easy to be misled into thinking that because concrete is as solid as rock that it will keep the outside air out of your basement, but actually the opposite is true. Concrete is one of the most porous materials there is when it comes to air and water infiltration.
That’s why after my foundation was poured, I immediately set to work insulating it with two inches of rigid insulation on the inside, and two inches of XPS rigid insulation on the outside along with waterproofing and cement board. If I want to build a home with a low R value I know that insulating the basement walls is key to creating the energy efficient, comfortable space that my family and I can enjoy.
Like other elements of my project, I like to know what I'm getting into and develop a plan even before the shovels hit the ground. If you’ve built a home or poured a foundation before, what considerations matter to you when it comes to this critical project element? Join the conversation and let us know.
There are a myriad of advantages to using the skills of an engineer for some of all of the portions of your homebuilding project. Sometimes your town may require a particular system in your new home to be an “engineered system” — for example, I am considering installing a sprinkler system in my new home, for which I’d have to have an engineer design it and provide plans and diagrams to the town.
Other times, engineers are useful to consult with when you want to verify that a system will work correctly, or you want expertise on an area of your project that you may not have as much experience with. Some engineers are employed directly by industrial companies, state agencies, or construction firms. Other engineers are more like “free agents” and consult on projects as needed by third party individuals or companies.
Through my experiences in home construction, I’ve learned to always know where I stand when it comes to knowing what I can do myself and what areas of a project that I should consult with professionals for. Whether it’s to meet building codes or out of some other necessity, engineers in consulting engineering companies provide a vital service through the independent expertise they offer.
As you probably know by now, the type of wall construction I'll be using for my new home is a pillar of my project. While some builders focus on mechanical systems or other more visible parts of a home's construction to try and save energy and reduce the home's carbon footprint, I know that a tight building envelope is the direction I want to go with my project.
A few weeks ago, I posted a detailed diagram of the wall construction techniques I plan to use for my home. From the architectural roof shingles right down to the foundation, this diagram provides a soup-to-nuts illustration of how I plan to drive the HERS score of my home all the way down to a 5, while providing a comfortable indoor environment for my family at the same time.
Even though I've worked with an architect firm and consulting engineers on the development and application of the wall construction techniques illustrated in this diagram, I am always looking for feedback on the design and selection of materials. If you've developed a proprietary wall construction technique for your homebuilding project, I'd love to know what you did and what your thoughts are of my design. Join the conversation and let us know!
When I visited my industry colleague and fellow eco-friendly homebuilder Bill Zdon a few months ago at a seaside cottage he’s renovating, he said something something to me that has stuck with me ever since. “Always remember Dave, at the end of the day a window is really just a giant hole in the side of your home,” Bill told me.
Bill is right, and as we move forward in putting together the skeleton of our new home, I have to consider how we are going to fill those giant homes in the side of my new home. Since a tight building envelope is a priority for me when it comes to this project, I want to make sure that we pick the right windows and doors for this project.
There are a lot of different window constructs and styles that I can choose from, and I am going into the selection process armed with a little bit of information from research I did myself beforehand:
- I will need custom windows for this project, because my home isn’t being built from a stock plan. Custom home plan, custom windows.
- I don’t have as much flexibility when it comes to the size of the doors - egresses have meet building codes and be able to function correctly during an emergency, and a door that’s too small or too large may not be up to code or may prevent a life-saving escape in an emergency. However, I have some latitude when it comes to the materials I pick for the doors. From pre-finished solid wood to metal or fiberglass, there’s no doubt that my choice of material will have a significant impact on the home’s final R value.
- There are quite a few styles of windows to choose from - single or double-hung, center bar or true arch, casement or sliders. Obviously aesthetics is a big factor for my wife and I, but if I can get a window style I like and boost the energy efficiency and comfort of our new home then that will help me meet our project goals.
To learn the “ins and outs” of windows and doors (no pun intended), I am working with David Lee of Rings End Lumber in Niantic, Connecticut. David is a veteran salesman of interior and exterior windows, doors and accessories and as such knows his products inside out. I am very optimistic that my meetings with him will be productive and contribute towards the success of my project.
In my experience, planning a homebuilding project almost never progresses in a linear fashion. While the execution of the project may proceed from a "point a to point b" way - beginning with the planning process, consultations with an architect firm, selecting materials and building the home - the order in which you plan the details of each stage of your project may not.
When I began thinking about what kind of home I wanted to build, I started by picturing what it would be like to walk through the door of my finished home. I imagined what kind of energy-saving features I would like to be greeted by when I walk through the front door, where I wanted the kitchen and dining room to be positioned, and other things like that.
Having a generally clear idea in my head of what I wanted the final product to look and feel like has helped me develop better plans for the earlier stages of my project. Working backwards to me means understanding what my goal is, and then breaking it down into units that can be planned independently.
A home-building project is a lot like a complicated dessert recipe - the selection and timing of the application of ingredients is very important. I know that as the "executive chef", the right methodology behind my planning can make a project smooth sailing.
What's your process for getting a major project like this underway to completion? Join the conversation and let us know!