Can You Drywall An Unheated Garage? (Super Helpful “How To” Tips!) is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to . The website is also an affiliate of a few other brands.

Can Drywall Be Installed in an Unheated Garage?

Yes you can install drywall in an unheated garage too! Drywall is cost effective and easy to install. For an attached garage you must use drywall for the garage wall adjoining the house, as per the building code.

Drywall is a great sheathing material for garage walls. You can tuck away utilities such as electrical wiring, communication cables and plumbing behind the drywall. Overcoat the drywall with paint and make your garage more presentable and livable.

An attached garage is more likely to be heated than a detached garage. But drywall is an excellent choice, even for an unheated detached garage. Get to know all about the advantages in my earlier post, 10 Reasons Why It Is Better To Drywall A Detached Garage.

Drywall for Unheated Garage

However, drywall and the installation of drywall can be adversely affected by low temperatures. The problems you may encounter are:

Drywall Cracking in Cold

All materials expand when it is hot and contract when it is cold. Drywall is no different. The difference is that drywall is rather brittle. Sudden variations in temperature can make drywall develop cracks.

For the most part these are hairline cracks and not visible, especially if the drywall has a flexible waterproof paint or covering on it. 

To prevent larger cracks in the drywall,

  • Ensure that you use garage wall studs from treated lumber, low in moisture content
  • Use drywall from a reputed brand and from a reputed store, to ensure low moisture content
  • Leave an expansion gap at the drywall board joints
  • Apply Drywall Mud correctly (see section below)
  • Keep your garage dry and well ventilated

Drywall is powdered gypsum, sandwiched between two layers of paper. Gypsum is highly hygroscopic; it readily absorbs moisture. Keeping the garage dry and well ventilated will reduce the risk of mold growth.

Joint Compound (Drywall Mud) Cracking

Joint Compound, also known as Drywall Mud, is used to cover the seams and screws of drywall installations. Nail holes and other small indentations can also be filled up with drywall mud.

Joint compound is water based and its drying time depends on the temperature and humidity. For best results, you should use the joint compound when the temperature is in the 65-80 degree F range and the humidity level is 20-40 percent range

Care should also be taken to apply the drywall mud in several layers. Thick applications are more likely to crack when temperatures drop.

What Temperature Is Too Cold for Drywall?

Low temperatures, even below freezing, do not affect the performance of drywall. Temperature and humidity are important during installation though. This aspect has already been covered in the above sections.

Having a drywall interior wall in an unheated garage will not be a problem, even in freezing winter conditions provided the garage is kept dry and well ventilated.

United States Gypsum Company (USG) is the manufacturer of the leading brand of drywall, Sheetrock. Under the “Limitations” section of the submittal sheet of USG SHEETROCK® BRAND they do not mention any lower temperature limit for usage.

It mentions that sheetrock should not be stored for long periods at temperatures above 125 degree F. Not a cause for concern unless you live in Death Valley!

However, the submittal sheet for USG SHEETROCK® BRAND ALL PURPOSE JOINT COMPOUND does advise you to protect the container from freezing, extreme heat and exposure to direct sunlight.

Can You Drywall a Garage Without Insulation?

You can drywall a garage without insulation. The drywall does not need insulation. However, your garage will be better off with insulation.

Drywall is not an alternative to garage insulation. Drywall offers very little insulation against heat and sound transfer. The R-value of ⅝” drywall is just 0.5625. This is nothing compared to the recommendation that the R-value of a garage wall be between 13-15

The good thing about is that it makes it a lot easier to add insulation. Prior to installing drywall in an unheated garage wall you can insert insulation batts, rolls or rigid boards in the gap between the wall studs.

Even if you want to add insulation as an afterthought you can do so easily. Get all the details from my earlier post, How to Insulate a Finished Garage? What you Need to Know!.

USG Sheetrock from Home Depot

Offering lightweight construction, the USG Sheetrock UltraLight 1/2 in. x 4 ft. x 8 ft. Gypsum Board is ICC-certified for sag resistance and eliminates the need for separate wall and ceiling panels.

It weighs up to 30% less than traditional 1/2 in. drywall for easier lifting, carrying and installation. For better work efficiency, these panels feature tapered long edges for easy finishing and a great, long-lasting look.

Material Cost for a 20 ft. x 8 ft. Drywall for Garage Wall

You will need 6 sheets of 1/2 in. x 4 ft. x 8 ft. UltraLight Drywall (allowing 10% for wastage). This will cost you $66.60

Thank you very much for reading the post. I do hope you found it informative and useful.

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