27 Apr

How to Seal a Concrete Sloping Garage Door

How to Seal a Concrete Sloping Garage Door

Garage doors may have bottom gasket seals installed to keep rain and snow — as well as dust, leaves and pests — from entering the garage. Installing this seal (also known as a weather strip) is usually simple enough. However, how do you seal a concrete sloping garage door? Steep slopes can render even the most effective seals useless, which could spell disaster for you and your garage come hurricane season. Protecting your garage here becomes an entirely separate matter.

What You’ll Need to Seal a Concrete Sloping Garage Door

  • Threshold/bottom gasket seal, a.k.a. a weather strip, which can usually be found at your local hardware store.
  • A box cutter/utility knife
  • Strong adhesive glue
  • Caulk/sealant gun
  • Pencil
  • Broom

How to Seal a Concrete Sloping Garage Door

  1. Start by opening your garage door and laying the seal between the door tracks. Make sure the 45º hump is facing the inside of the garage.
  2. Use your boxcutter to cut the ends of the seal to make sure it fits between the garage door’s tracks.
  3. From the inside of the garage, lower the door so it hovers over the seal. Push the 45º hump against the posterior of the door and use a pencil to trace its edge onto the garage floor.
  4. Open the door again and move the seal out of the door threshold.
  5. Use a broom to clean the area you plan on installing the seal.
  6. Load your sealant gun with adhesive and cut the tip of the tube’s nozzle at about a 45º angle with your box cutter.
  7. Turn the seal over and, making sure it’s flat, generously apply 2 beads of adhesive along the bottom of each side of the bottom about 2 inches from each edge. Then, apply a third bead between the first two in an up/down “zig-zag” pattern.
  8. Slide the threshold set it against the floor, lining its edge top edge with the line you traced on the floor.
  9. Press down on the seal to spread the adhesive evenly and make sure it’s bonding tightly with the floor.
  10. Now close the door leave it down AT LEAST 24 hours in order to allow the adhesive to fully bond.