Doors – How to insulate the garage door

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Over the past year I've been converting our integrated garage so that it's a usage space.

I've painted the walls, got lighting, power and water connected (To allow for a washing machine to be installed) plus floor is now carpeted using tiles. Also I've installed lots of shelving and storage.

It's become a really useful space in the house now, that we use for projects, storage and lots of other tasks.

However being early December the weather is quite cold, which means the garage gets pretty chilling. The garage door at one end of the garage takes up the entire end and is a large metal door. So basically one end of the garage is a giant heatsink!

In order to prevent so much heat loss I'm thinking of doing the following:

  • Attaching loft insulation to the inside of the door
  • Installing draft excluders at the bottom (and possibly) sides of the door

Thoughts, suggestions, feedback?

Best Answer

I just finished our garage this past summer and here are a few things I did.

I insulated the garage door by cutting pieces of rigid insulation foam to fit into each piece of the garage door. You can glue them on and then seal the edges with expanding foam or caulk.

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On the side of garage door I installed weather strips and also on the top/bottom of the door so that it is sealed when the door closes.

If you have any windows I would make sure to seal them (I boxed mine in with wood and then caulked). Also depending how you finished the bottom of the garage walls, I would seal the bottom (my drywall buts up right to the cement floor, so I sealed the space with expanding foam and cut the excess away).