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Insulating a shed will reduce damage to your stored tools, equipment, or boxes. It can also make it more versatile, allowing you to store plants or use it as a rec room. Properly insulating a shed requires you to seal gaps, install sheets of insulation, and possibly cover them with drywall.

Part 1
Part 1 of 3:

Sealing the Structure

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  1. There is no use insulating the walls if the windows are gapped or broken.
  2. If you are going to use it for a guest room or home office, this is essential, since single glazed windows will allow a large amount of heat loss, and depending on which side your shed faces, let a lot of heat in during summer.
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  3. Seal thin gaps with caulk. Use expandable spray foam for larger holes.
  4. Install a roof with a good drainage system. You can use shingles, metal roofing, or fiberglass.
    • In the absence of rain, use a garden hose and spray it over the roof. Look inside for signs of leakage.
  5. Filling holes and establishing a barrier between the outside is important if you are going to keep the temperature constant inside the shed. Look for dark stains in the walls to identify water leaks in the shed.
  6. Most shed kits don’t come with a weatherproof model. You may need to purchase a custom size if your shed door is smaller than a standard home door.
  7. Hire an electrician to ensure it will be safe. Extension cords from the house are not safe.
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Part 2
Part 2 of 3:

Choosing Insulation

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  1. This space will dictate the width of the sheets or batting you are going to buy.
  2. These standard wall sizes allow you to roll out and secure the insulation between studs, joists, and beams. It is relatively expensive and best on unfinished walls.
  3. They are fairly thin but work well, although they are not recommended if you have a lot of electrical outlets.
  4. Keep in mind that wool will need regular upkeep and maintenance. Without proper cleaning, wool will break down and rot over time from its natural dirt and oils. Although fiberglass insulation is a similar option, it must be covered or it is unsafe for humans.
  5. You can cut holes into the walls and blow the insulation into the frame. [1]
  6. It is flexible, so that it can bend around corners or other obstructions. [2]
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Part 3
Part 3 of 3:

Installing Insulation

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  1. Some of these methods require special equipment.
  2. They should help you to purchase enough to cover the shed. They will require your stud spacing measurements as well.
  3. Set the polystyrene against the frame.
  4. Staple it into the studs. [3] You will need to glue polystyrene sheets onto the walls and studs with a special adhesive.
  5. Continue moving up the wall in horizontal sheets. You can cut the insulation sheets with scissors to make a smaller section.
  6. You will need to leave at least a two-inch gap between the top of the ceiling and the insulation to let moisture escape.
  7. You will want to hang the sheets on the ceiling first, followed by wall sheets.
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Expert Q&A

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  • Question
    Do shed walls need a moisture barrier?
    Anthony "TC" Williams
    Experienced Landscaper
    Anthony "TC" Williams is a Professional Landscaper in Idaho. He is the President and Founder of Aqua Conservation Landscape & Irrigation, an Idaho Registered Landscape Business Entity. With over 21 years of landscaping experience, TC has worked on projects such as the Idaho Botanical Garden in Boise, Idaho. He is a Idaho Registered Contractor and a previously Licensed Irrigator in the State of Texas.
    Experienced Landscaper
    Expert Answer
    It would certainly be beneficial if you were able to install a moisture barrier for your shed walls.
  • Question
    How do I insulate a wooden shed with electrical already installed?
    Anthony "TC" Williams
    Experienced Landscaper
    Anthony "TC" Williams is a Professional Landscaper in Idaho. He is the President and Founder of Aqua Conservation Landscape & Irrigation, an Idaho Registered Landscape Business Entity. With over 21 years of landscaping experience, TC has worked on projects such as the Idaho Botanical Garden in Boise, Idaho. He is a Idaho Registered Contractor and a previously Licensed Irrigator in the State of Texas.
    Experienced Landscaper
    Expert Answer
    You will need to be careful as you install the insulation around the wiring and outlets.
  • Question
    Does insulation go over or behind wiring?
    Andy Orr
    Community Answer
    Sort of both, you make a shallow cut/score horizontally across the batt and slide half of the fiberglass behind the wire and flab, with the remaining half in front of the wire - essentially sandwiching the wire in-between the fiberglass.
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      Things You'll Need

      • Measuring tape
      • Caulk
      • Expandable spray foam
      • Double glazed windows (optional)
      • Weatherproof door
      • Siding (optional)
      • Scissors
      • Foam/spray insulation
      • Polystyrene sheets
      • Blanket/batt insulation
      • Foil bubble wrap insulation
      • Wool insulation
      • Staple gun
      • Staples
      • Glue
      • Drywall sheets (optional)


      About This Article

      Article Summary X

      Before insulating your shed, make sure it's sealed, replace any broken windows, and patch any holes in the roof if necessary. Then, measure the space between the studs and the size of your shed so you know what width of insulation to buy. If your measurement is between 18 and 24 inches, purchase blanket or bat insulation and roll it out between the studs. As you move up the wall, overlap sheets of insulation where they meet. Alternatively, if your studs are closer together or further apart, use an insulation spray instead. For tips on when to use wool insulation or when you should call in a contractor, keep reading!

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