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No, there should not be a gap between your garage door and the floor. Gaps can make your garage less energy efficient, leading to higher energy bills. They also create an entry point for pests like rodents and insects, as well as rain and melted snow, which can lead to foundation damage or mold issues.

If you have a gap under your garage door, potential causes include an uneven garage floor or worn-out weather stripping. To fix it, you can try several solutions:

• Replace the weather stripping: The seal at the bottom of the door may need to be replaced.

• Adjust the garage door: You may be able to adjust the closing position on your garage door opener to eliminate the gap.

• Inspect the floor: If the concrete floor has shifted or is uneven, it may need to be repaired to create a level surface.

If these solutions do not resolve the issue, it is best to call a garage door repair specialist to inspect the door and floor.

If your cement garage floor is sinking and cracking, your first step should be to call a local structural engineer to assess the problem. They can determine if it’s a minor amount of sinking related to normal settlement or if the issue is structural in nature. If you do have structural damage, the engineer or a foundation repair company that you hire will come up with a plan to fix the issue, which often consists of mudjacking for less severe issues or underpinning for more extensive problems.

Getting a garage door tune-up is worth it. Tune-ups are a form of preventative maintenance that help extend a garage door's lifespan and prevent dangerous issues, like worn springs or misaligned sensors. The cost to get a garage tune-up is far less than letting problems get out of hand and causing costly repairs—or worse—injuries.

The most affordable way to insulate a garage involves choosing cost-effective materials like fiberglass, which comes in batts or rolls and is relatively easy to install. You can often install this type of insulation without needing to add drywall, which helps reduce costs. While a DIY approach might seem cheapest, hiring a professional installer can be highly cost-effective. Experts can accurately determine your garage's specific insulation needs and ensure the best results for your investment, often using batt insulation for the bulk of the project.