Is it safe to put fiberglass insulation around heating ducts?

Fiberglass insulation can touch HVAC ductwork provided the ducts are not leaking or forming too much condensation. The insulation should be snug enough to prevent significant gaps throughout the ductwork.

What type of insulation is best for ducts?


Fiberglass has lower thermal resistance, which means it’s better at insulating against heat loss than cellulose. Cellulose also reflects more sound from space than fiberglass does because of its higher density (though both are considered good for noise reduction).

Can you put insulation around ductwork?

Batt insulation – For an affordable solution, foil-backed fiberglass or cotton batt insulation can be cut to size, fit around your ducts and taped into place. Foil-backed self-adhesive foam – This type works especially well for irregularly shaped ducts. Simply wrap it around the ducts and press it into place.

Can you use bubble wrap insulation on ductwork?

Quote from the video:
Quote from Youtube video: I've used fiberglass for years and years with staples and it works great this bubble wrap is a lot faster than the fiberglass. And if it's done right you will easily last 50.

How do you insulate existing ductwork?

When insulating HVAC ductwork, use a foil, faced fiberglass insulation with an R-6 or higher R-value. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Make sure the foil surface of the insulation is free of dust before applying the tape.

Is fiberglass duct liner safe?

Fiberglass, at a minimum, is an acute physical irritant to the skin, eyes, and upper respiratory tract. While no long-term health effects should occur from touching fiberglass. Rashes can appear when the fibers become embedded in the outer layer of the skin.

How do you insulate metal ductwork?

Quote from the video:
Quote from Youtube video: Gone so at the least case we would use something like this this is a foil tape it's designed to be able to stick onto metal even in cold weather.

Does metal ductwork need to be insulated?

Without proper ductwork insulation, you could be losing 10-30% of the energy used to heat or cool your home. A good level of ductwork insulation will prevent not only energy wastage, but also leaks, temperature drops, and condensation buildup.

What R-value do I need for duct insulation?

R-value of 3.5 is required for buried ductwork and ducts installed in an unvented attic with roof insulation or in an unconditioned space (including both ventilated and unventilated crawlspaces). There are no R-value requirements for ductwork installed in an indirectly conditioned space.

How do I stop my ductwork from sweating?

What can I do about ductwork sweating?

  1. Reduce the humidity level around your air ducts. Keep ducts spaced apart so air can flow between them. …
  2. Unblock any ducts that are restricting air flow and have them cleaned regularly. …
  3. Keep your air filters clean and change them regularly. …
  4. Repair leaking ducts.

Can you double wrap duct insulation?

Note: if your ducts are actual insulated tubing, you can “double wrap” these if you live in extreme temperatures or you suspect these ducts aren’t quite cutting it.As you complete each section, you can secure the insulation to the ducts using wire.

Can you use Reflectix on ductwork?

Ease of handling and quick installation make Reflectix® the first choice when selecting insulation for round or rectangular ductwork in HVAC systems. The product provides an R-8.0 when installed with a 0.75” air gap between the duct and the insulation, and R-6.0 when installed direct to the duct without a spacer.

Is Fiberglass Insulation flammable?

Fiberglass insulation is made of glass combined with plastic polymers and is naturally fire-resistant. However, you need to be careful with batts that are backed with foil or paper as these materials can burn quickly.

Should you replace old ductwork?

If your ductwork is over 15 years old, you probably should replace it. Ductwork has a maximum lifespan of 20-25 years. By 15 years, however, it begins to deteriorate, significantly reducing your HVAC system’s efficiency, so replacement is the prudent option.”

How do you seal and insulate ductwork?

Quote from the video:
Quote from Youtube video: Wrap. All ducks with foil Faced fiberglass insulation having an R 6 value or greater and sealed the joints with foil face duct tape prefer a hands-off approach to your ductwork.

Can I seal my own ductwork?

Some homeowners choose to take on duct sealing as a do-it-yourself project. Start by sealing air leaks using mastic sealant or metal tape and insulating all the ducts that you can access (such as those in attics, crawlspaces, unfinished basements, and garages). Never use duct tape, as it is not long-lasting.

Can You Use Flex Seal on ductwork?

Flex Seal can be used for ductwork, interior HVAC walls, wood, concrete, metal, etc.

What do you use to seal ductwork?

Water-based mastic duct sealant is the best option because it cleans up easier and will hold up for a long time. When using mastic duct sealant on your own, you can apply it with a simple paintbrush. You may also use a caulk gun to apply the duct mastic, though it’s not necessary.

Can you use great stuff on ductwork?

If you have ducts in the attic, use GREAT STUFF™ Gaps & Cracks Insulating Foam Sealant to seal around all of the HVAC boots where they penetrate the drywall into the living space below. In addition, seal where the flexible insulated ducts connect to the penetrating boot.

Can I use silicone to seal ductwork?

It’s not only easy—it’s cheap! Simply buy aluminum-colored silicone caulk and caulk every joint in rectangular ductwork (clean the joints first with a household spray cleaner and a rag to remove dust). Use the caulk to seal around the take-off boots to each branch run.