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February 26, 2021

Professional Tool Reviews for Pros


Top 10 Weatherization Techniques That Work to Reduce Energy Use

With all the buzz in the media about green building and energy conservation in construction, there is a new word that has come into play, and that is “Weatherization”. The core idea of building weatherization is to protect a building and its interior from the elements. The main elements that make havoc in a home in regards to energy usage and efficiency come from the sun, precipitation, humidity and wind.

Weatherization Techniques That Work Owens Corning insulation

With all the buzz in the media about green building and energy conservation in construction, a popular word you hear more and more is “weatherization”. Good weatherization techniques apply building materials to protect a building and its interior from the elements. Chiefly, good weatherization techniques reduce energy use in the home.

Many elements wreak havoc in a home with regard to energy usage and efficiency. These include the sun, precipitation, humidity, and wind. Good weatherization techniques effectively neutralize the effects of these elements. These involve repairing, renovating, and modifying a building to both reduce energy consumption and boost energy efficiency.

10. Effective Weatherization Techniques Start with a Plan

It’s probably good to think of weatherization techniques as a whole-house scenario. You need a comprehensive plan in order to save real money. While insulation matters, some folks might think adding some minor batting is sufficient. To truly take advantage of all that weatherization can do, it’s best to look at the entire building as a “system”.

For example, many types of insulation provide some weatherization. They help guard against both heat loss or heat gain. The trouble is that insulation has its limits since it doesn’t normally stop drafts, air leaks, or moisture. Many times weatherization in a home can include things such as insulation, air sealing, ductwork repairs, HVAC system upgrades, exhaust fan dampers, caulking, and weather stripping on doors and windows.


Weatherization Works to reduce energy use - Common Air Leaks
Common Air Leaks (image courtesy of USDOE)

Statistics from the United States Department of Energy show that buildings use one-third of all energy consumed and nearly two-thirds of all electricity. Due to the high energy usage, buildings are a major source of pollution that causes urban air quality problems. When a home is properly weatherized, oftentimes it will greatly improve the overall energy efficiency of the home. This can mean significant cost savings on energy bills and also less energy being consumed.

9. Sealing Up Ductwork

Poorly sealed ductwork can account for 20% of heat loss. Simply sealing supply and return air ducts can greatly improve a home’s efficiency by keeping conditioned air in the home. A mastic-type product should be used to properly seal old ductwork to make them airtight. Duct tape (“duck”” tape), despite the name, should not be used—at least not on its own. It isn’t suitable for the extreme environments of moist crawlspaces and hot attics where ductwork lives.

8. Watch Those Recessed Light Fixtures

Recessed light fixtures—also called can lights or high-hats—can leak large amounts of conditioned air into unconditioned attic space. They can also allow hot attic air to enter the home. Even IC-rated products can transmit heat from the attic into your living space if not properly insulated.

Products on the market exist that cover standard non-IC-rated can lights from the attic side. They serve to keep insulation and other materials from coming in contact with the hot fixture. They also stop the leaking air. One other thing you can do is swap out energy-robbing incandescent and CFL bulbs for newer LED bulbs. Those use 60% or less energy.

7. Insulation in Walls, Floors, and Ceilings

Yes, we included insulation. After all, it works. Your code requirements for insulation vary depending on the construction type, age of the home, and geographic location. One thing that is certain is that insulation makes for one of the most important weatherization techniques available to a homeowner. You need to make sure you have enough insulation—but also that you have it in the proper areas.

insulation weatherization techniques reduce energy use

There are many types of products available now, and each has its own strong points. You probably can’t do much about your walls in a home that already exists. For new construction, however, pay attention to what your builder installs. For walls normally, fiberglass batts are used in addition to expanding spray foam solutions.

At one time doing spray foam was a product left for the pros. Now there are a good number of DIY spray foam kits on the market. Armed with the right protective gear and a little know-how; you to can take advantage of this excellent insulation material too.

Of course, you can add insulation to your home attic using blown-in fiberglass or cellulose. Most builders now advertise high R-values in “green” homes, but that wasn’t always the case. If you bought or have an older home, check that attic. It likely lacks enough insulation—but you can add more very easily. Check out this quick guide of recommended R-values for insulation:

Energy Star insulation map R-values
Image courtesy of energystar.gov
ZoneUninsulated AtticExisting 3-4″ of Insulation
1R30–R49R25–R30
2–3R30–R60R25–R38
4R38–R60R38
5–8R49–R60R38–R49

6. Sealing Cracks, Gaps & Holes

One of the simplest but still crucial weatherization techniques to reduce energy use involves simply tracking down open leaks in a home. In older homes, there are many places for air and moisture to leak in. This is especially true around doors, windows, pipes, and wiring that penetrate the ceiling and floor.

Depending on the size of the penetration or the crack, you should use products like spray foam, caulk, weather-stripping, door sweeps, and so on to help minimize infiltration. For larger cracks, you may need to first fill the area with something like steel wool or mesh. This gives you a base onto which you can apply expandable polyurethane foam that easily trims flush for painting and blending.

5. Reduce Energy Use with Proper HVAC Systems

Of all the items that fall in the scope of weatherization techniques, HVAC systems can be among the most costly single item to have to replace. Many times, by simply repairing ductwork and adding insulation, you can boost the efficiency of your older equipment.

Klein Tools HVAC Clamp Meter with Differential Temp Probes

4. Insulate Water Heaters and Add Timers

When considering additional weatherization methods to reduce energy use, look no further than your water heater. Actually, look a bit further—but you get the idea. You can protect water heaters and pipes from corrosion and freezing by insulating them. You also help water heaters trap energy by surrounding them with insulation as opposed to leaving them exposed. This benefits colder climates the most.

For an extra tip, consider adding a timer so that your electric water heater doesn’t come on during the day while both you and your spouse are at work.

3. Check Entry Doors for Air Gaps

If you can see light shining through the edges of your door, it’s not properly sealed. Light=airflow, so see if you can tighten up the seal by adjusting the latch or adding weatherstripping. One or both of these techniques can quickly and inexpensively seal up a draft that may be costing you money.

In a worst-case scenario, you may need a larger adjustment to fix a sagging door. You may even need to replace a drafty door with something entirely new. In either case, this presents a high-leak area that vacuums money from your wallet every month.

door leak weatherstripping

2. Seal Those Windows!

Just like the doors above, windows often leak like crazy—and you have more of them. While this can be an expensive option, sometimes all that is needed is some new weatherstripping or even some caulk. Other times, small adjustments to a window can make them close and seal properly again.

On really old homes where you never tend to open the windows, we’ve seen people seal them up completely with caulk. While we don’t really like this option, it can serve as a stopgap until you eventually renovate and replace those windows.

1. Consider Adding Radiant Barrier

For an amazingly effective weatherization technique, consider installing a radiant barrier in your attic. More than anything, radiant barriers, combined with adequate ventilation and insulation, can dramatically reduce energy use. They keep out “radiant” heat—the part of the heat that produces a majority of the temperature change in attics.

stapling radiant barrier

With Weatherization Techniques, Professionals Can Help

If you are not sure what issues your home might have, you can hire a weatherization professional that would come in and do a comprehensive energy audit of your home. Normally they would look at your energy bills from the year of two previous to get an idea of the energy consumption. Then they would use some specialized equipment, like a blower door, pressure pan, infrared cameras, and moisture meters to get an accurate picture of what is really happening in your home. Their testing will identify where your energy leaks are.

Weatherization Works
Source: EPA

Making your home more energy-efficient can save you money while helping save the environment. There are a variety of financial incentives and programs that can help with the cost of these improvements as well. Many times there are either federal, state and even local programs, rebates, tax incentives, and other things available to help you with your weatherization projects.

The savings from doing the right thing may even be enough to pay for the improvements. For more information here are some of the sites that are at the top of our list to visit:

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Conrad Baumgartner

Decent enough article but your photo showing an amateur (i.e. lowest paid laborer) installing insulation improperly does not say much about professionalism or doing it right. Insulation should be installed in a manner to fully fill the cavity evenly without leaving voids as is visible along most of the edges in the photo. Those voids do reduce the insulation levels.

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