Do you know how to draft proof your garage? Pros say it will lower energy bills and improve comfort levels further inside your home

Draft-proofing your garage can make a significant difference in maintaining your home’s overall comfort and energy efficiency. Garages are prone to drafts from large doors, windows, and structural gaps, but with the right steps, you can keep cold air out and save on energy costs.

Here, our heating, ventilation and air conditioning (HVAC) experts reveal exactly how to do it, and recommend the best products to use and the common mistakes to avoid.

Knowing how to winterize your garage will keep those pesky drafts out, ensuring greater comfort and lower bills.

The steps to draft proof your garage

Step 1: Start with the garage door

Garage doors are one of the largest sources of drafts. Ensuring the garage door is insulated and well-sealed will be key to preventing heat loss.

Steve Pacholski, brand president of HVAC experts Varsity Zone, says, 'Your garage is more than just a storage space – it’s a connection between your home and the outdoors especially, if it’s attached. With a giant door constantly exposed to outside weather, it acts almost like an extra room that can allow cold air to creep into the rest of your home. When that happens, your heating system has to work harder.

'To draft proof your garage, start with the garage door. Swap out any worn weatherstripping and add a bottom seal if it looks like cold air is sneaking through.'

Pacholski recommends this Elvone Store Garage Door Seal from Amazon, adding, 'This kit includes everything you need for installation and is perfect for reducing airflow around the edges of your door – blocking drafts, dust, and moisture.'

Josh Mitchell, HVAC technician and founder of Air Conditioner Lab, also recommends opting for a garage door insulation kit, such as the Matador Garage Door Insulation Kit from Amazon. He says, 'These kits typically include layers of reflective foil or foam panels that fit into the door sections, providing substantial thermal resistance.'

For extra protection, Pacholski also likes AES Us Energy Products Double Bubble Reflective Foil Insulation from Amazon, adding, 'It's a lightweight, affordable option that works as a reliable thermal barrier.'

All prices correct at time of publication.

Step 2: Address gaps and cracks

Even small gaps and cracks in the walls or flooring can allow drafts to enter. Sealing these areas is essential to achieving a draft-free space. Head of Solved, Punteha van Terheyden found weatherstripping was a quick and easy fix for her drafty front door.

Pacholski says, 'Don’t overlook the smaller gaps – they can make a big difference. Cracks around windows, outlets, or where the garage connects to your house are common spots where drafts sneak in. A bit of caulk or spray foam can seal those up quickly.'

If your garage walls have been plastered, our guide on how to fix cracks in plaster walls will come in handy for your DIY task list.

Mitchell adds, 'Use silicone caulk to seal any windows in the garage for a waterproof seal that will last for years. Install a new door sweep for the pedestrian door and replace any cracked or old weatherstripping around the door frame.'

Step 3: Seal windows and doors

Windows and access or internal doors in the garage often have gaps around the frames that let in cold air. Addressing these weak spots can make a noticeable difference in temperature regulation.

Mitchell says, 'Use silicone caulk to seal any windows in the garage for a waterproof seal that will last for years. Install a new door sweep for the pedestrian door and replace any cracked or old weatherstripping around the door frame.'

Applying insulation film to windows can add another layer of protection. For more tips, check out our guide on how to weatherproof your windows.

Step 4: Check the ceiling and walls

The ceiling and walls of your garage may have uninsulated areas or cracks that allow drafts to infiltrate. These should be inspected and treated to improve energy efficiency.

Mitchell says, 'If the walls and ceiling are unfinished, install fiberglass batt insulation. If exposed, make sure it's covered with fire-rated drywall, as this is typically a code requirement.'

Mitchell recommends Owens Corning R-19 Fiberglass Insulation Batts, available from Insulation4US, adding, 'These are ideal for walls, covering up to 40 square feet per roll. These batts are pre-cut for easy DIY installation and provide excellent fire resistance.'

Our guides on 'What is glass wool insulation?' and how to draft proof a basement include more fiberglass batt insulation tips. Before proceeding however, check out what our experts say about when to insulate a garage and when to avoid it.

Draft proofing essentials pros swear by

When it comes to draft proofing your garage, there's an endless list of products available. But which are the best? We asked Francisco Fuenmayor, a home improvement expert at LocalProBook, to recommend his top trio...

FAQs

Is it worth draft proofing a detached garage?

Yes, even detached garages can benefit from draft-proofing. It helps maintain a consistent temperature, protects stored items from extreme conditions, and may help reduce pests by blocking their entrance. Insulating a detached garage can also improve its usability as a workspace.

What type of insulation works best for garage walls?

Rigid foam insulation or spray foam is ideal for garage walls due to its moisture-resistant properties. Fiberglass can be used but should be paired with a vapor barrier to prevent mold. Choose insulation based on your climate and garage usage.

How often should I inspect my garage for drafts?

Inspect your garage for drafts annually, ideally before winter. Regular checks help identify new cracks or wear in seals, ensuring your draft-proofing remains effective. Addressing issues promptly prevents larger problems from developing.

Draft-proofing your garage not only keeps the space warmer but also helps maintain the energy efficiency of your home by stopping cold air moving inside. By addressing common problem areas and avoiding draft proofing mistakes, you can create a more comfortable and functional garage.

Next, check out whether you should close vents in unused rooms.