How to insulate a shed floor

Updated April 17, 2017

Insulating your shed floor will keep the floors warmer and reduce the wear and tear on the electrical equipment you keep in there. Items like lawnmowers and hedge trimmers can weather the elements to a certain extent, but it's best to keep them at a steady temperature all year. Additionally, if you use your shed as a workshop for building and repairing things, you'll need an insulated floor for the hot and cold months of the year. The insulation of a floor is a relatively easy process, but safety should be a main priority.

Lift the floorboards in the shed with the crowbar to gain access to the beams below the floor. Be careful not to damage the wood as you pull it up. It's still your floor; you just need to pull it up to insulate it.

Follow safety precautions for installing insulation. Wear long sleeves, gloves, goggles and a face mask, according to Fibreglass can be hazardous to your health if ingested or too much contacted is made, so be careful when working with it.

Fill every nook and crevice between beams with fibreglass insulation. Have a utility knife handy in case you need to trim the fibreglass to fit into certain spots. Make sure every inch of space is filled.

Lay the floorboards back down. Nail into place with a hammer. You should notice a huge difference in temperature after you insulate the floor.


Before pulling up your floorboards, make a mental note of which boards go where, so you can lay them back down exactly as they were before. You also can write numbers on them and then just lay them back down in numerical order.


Fibreglass contains certain chemicals and toxins that are hazardous to your health.

Things You'll Need

  • Fibreglass insulation
  • Crowbar
  • Utility knife
  • Nails
  • Hammer
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About the Author

Mitchell Holt has a bachelor's degree in print journalism from Abilene Christian University and has been freelancing since 2009 with work published in various newspapers and magazines like "BostonNOW" and "The Abilene Reporter-News." Holt also writes sales copy for small businesses. His clients include The Kyle David Group, ITNewton, 18 Vodka, RoboQuote and more.