Marianne Martinez
Joist panning is a technique used for HVAC ductwork, specifically for cold air returns. It involves attaching a material, such as sheet metal, foil-faced cardboard (e.g. Thermopan), or bubble insulation (e.g. EcoFoil), to the bottom of floor joists to create a duct for returning air to the HVAC system. This method is relatively straightforward, cost-effective, and requires less material than traditional metal ducts. However, it is important to consider potential issues such as leaks and mould growth, especially when installing in cooler regions or basements. Proper sealing and periodic duct cleaning are essential to mitigate these problems.
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What You'll Learn
Using sheet metal
Installing joist panning with sheet metal is a more expensive and labour-intensive option compared to other materials like foil-faced cardboard. However, if you still want to use sheet metal for your installation, you can follow these steps:
First, decide on the type of sheet metal you want to use. You can purchase sections of round metal ducts for standard returns, or you can use sheets of metal for joist panning. If you opt for sheets of metal, you can find products like 16" x 30" galvanized sheet metal for single joist panning.
Next, cut the sheet metal to the required length and width to fit between or underneath the floor joists. Ensure you have the necessary tools to cut the sheet metal safely and accurately.
After cutting the sheet metal to size, you will need to install it at the bottom of the floor joists. This may involve stapling the sheet metal directly to the joists or using a suitable adhesive to secure it in place. Make sure you follow the manufacturer's instructions or seek professional advice if you are unsure about the installation process.
Once the sheet metal is installed, you will need to seal the seams to ensure that the ductwork is airtight. You can use reflective tape to wrap the seams, creating an airtight barrier. This step is crucial to ensuring the efficiency and performance of your HVAC system.
Finally, inspect your work to ensure that the sheet metal joist panning is securely installed and that there are no gaps or openings that could cause air leakage. Remember that even small cracks or openings can affect the performance of your HVAC system and may require additional sealing.
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Foil-faced cardboard products
If you choose foil-faced cardboard, you will need to put in some effort to create a sealed return. To install Thermopan, simply staple it to the joists. You can also use foil-faced insulation board to line a joist bay, as long as it is securely attached with sealant or foil tape to make all the joints in the duct airtight.
Thermopan is made from recycled products and is moisture-treated against dampness. However, it is not flexible and requires some effort to create a sealed return. It could also be damaged if there is excess moisture present.
If your heating and cooling ducts are located in your attic, or you want to improve your HVAC system's efficiency, you should consider insulating your ducts with a product such as EcoFoil Duct Insulation. This product is also available in the form of rolls that can be adjusted to fit between or beneath the floor joists.
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Radiant barrier bubble insulation
The installation process for radiant barrier bubble insulation is straightforward. First, cut the foil insulation to size using a utility knife. Then, install the material to the bottom of the floor joists, sealing the seams with reflective tape or insulation tape. This process can be done quickly with just a utility knife and a stapler, and the pre-cut widths of the insulation make it perfect for installing between floor joists.
Additionally, radiant barrier bubble insulation acts as a vapour barrier when the seams are sealed, preventing the passage of moisture and improving indoor air quality. It is lightweight and easy to manipulate, making it a preferred choice for buildings in colder climates or regions with significant seasonal temperature variations. Overall, radiant barrier bubble insulation is a cost-effective and efficient way to improve a building's energy efficiency and create a comfortable indoor environment.
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Sealing with duct mastic
Sealing duct seams is a messy job, so be sure to wear old clothes. Mastic is a gooey, non-hardening material that can be spread over duct seams with a disposable paintbrush, putty knife, or your fingers (be sure to wear rubber gloves if you use your fingers). Gaps in ductwork or plenums that are over 1/16 or 1/8 inch wide can be sealed with mastic, as long as the gap is first reinforced with fiberglass mesh tape. If you are using mastic to seal seams in fiberglass board ductwork, use fiberglass mesh tape for all joints. Manufacturers of mastic include Hardcast, McGill AirSeal, Polymer Adhesives, RCD Corporation, and ITW/TACC.
Before applying mastic, ensure that the joint area is wiped clean to remove particles and dust. If the joint isn't clean, the mastic won't create a tight seal. Apply enough mastic to form a continuous coating on the surface of the duct. Work the mastic into the joint or crack and press lightly to get an even coating. There should be at least a 1/2-inch overlap around any joint, crack, or hole in the duct.
Use mesh tape to reinforce the mastic coating on areas where there is a gap of 1/4 inch or more. This is especially important if the area being sealed is a joint that will be under stress. It is important to make sure that the tape used for sealing the joints is designed specifically for mastic. Duct tape should not be used to seal ducts as it will dry, crack, and eventually give way to costly air leaks. By making sure that the HVAC contractor properly applies mastic and UL-181-rated tape to every joint in the home's duct system, builders can improve the energy efficiency of the home.
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Installation methods
Joist panning is a simple and cost-effective method for installing ductwork for your HVAC system. It involves utilising the space between the floor joists, requiring significantly less material than traditional metal ducts. Here are some common installation methods for joist panning:
Sheet Metal
One approach is to use sheet metal, which is attached to the bottoms of adjacent joists to create a duct for returning air to the HVAC system. While this method is convenient and inexpensive, it has been associated with issues such as leaks and inadequate air sealing. Sheet metal is also the most expensive and labour-intensive option.
Foil-Faced Cardboard
Products like Thermopan are foil-faced cardboard options that are user-friendly and flexible. However, they require more effort to create a sealed return and may be susceptible to damage from excess moisture.
Bubble Insulation
EcoFoil offers bubble insulation products that come in rolls sized to fit between or underneath the floor joists. This option is more economical than sheet metal, highly flexible, and can be made completely airtight by wrapping seams with reflective tape. When using EcoFoil or Thermopan, simply staple the product to the joists and seal the seams.
Duct Board or Closed-Cell Foam
If installing a return air duct in a basement joist bay, you can line the bay with duct board (foil-facing inside the duct) or closed-cell foam, such as Armaflex, which doesn't trap dust and mould spores. Ensure that all joints in the duct are made airtight using sealant or foil tape.
It is important to note that some sources advise against using panned joist returns due to potential issues with leaks, inadequate sealing, and the introduction of mould and allergens into the HVAC system. However, with proper installation and sealing techniques, these issues can be mitigated.
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Frequently asked questions
Joist panning is a technique used to install ductwork for an HVAC system. It involves attaching metal sheets or foil-faced cardboard to the bottom of floor joists to create a duct for returning air to the HVAC system.
Metal sheets, foil-faced cardboard products (such as Thermopan), and bubble insulation products (such as EcoFoil) can be used for joist panning. Metal sheets are the most expensive and labour-intensive option, while foil-faced cardboard products are more user-friendly but less flexible. Bubble insulation is flexible and economical.
To install joist panning, you need to attach the chosen material to the bottom of the floor joists and then seal the seams. If using Thermopan or EcoFoil, staple the material to the joists and use a utility knife and stapler to manipulate it. For bubble insulation, wrap seams with reflective tape to make them airtight.
Joist panning can be leaky, especially at junctions between wood and metal, which are difficult to seal. Panned bays located in cooler areas can also encourage mould growth due to condensation. Additionally, duct cleaning can be challenging due to obstacles such as pipes, wires, and cross-bracing.
