Cody Casey
Installing a garage door behind a recessed concrete pan seat can be a challenging task, especially if you are dealing with sloped concrete. One option is to cut a groove in the concrete to accommodate the thickness of the door panel, ensuring it can lower into the groove smoothly. Another approach is to modify the door itself by cutting the bottom panel at an angle so that it sits flush with the concrete. This modification can be done by a sheet metal shop for metal doors or a millwork company for wooden doors. It is important to consider the overall aesthetics and functionality of the garage door, as well as the potential challenges posed by water runoff and the need for proper sealing to prevent water intrusion.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Purpose of sill pan | To ensure that no water comes in under the door |
| When sill pan is necessary | When there is standing water outside the door or when the outside concrete is at the same height |
| Use of sealant | Always set the door in a heavy bead of sealant, whether you use a sill pan or not |
| Custom bottom panels | Cut the bottom panel at an angle to sit flush |
| Custom bottom panels | Incorporate the angle without extending the panel height |
| Custom bottom panels | Modify a wood door by cutting it on a matching angle and installing the hardware properly |
| Recessed panel garage door | Shaped from solid steel and embossed with a natural wood grain finish |
| Garage door installation on sloped concrete | Grind the edge of a concrete slab to slope away from the garage door |
| Garage door installation on sloped concrete | Cut a groove in the concrete to lower the door into |
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What You'll Learn
Use an exterior door install kit
Exterior door installation kits are available for installing a door on a concrete slab. These kits include flashing, pan, caulk, etc. Here is a step-by-step guide on how to use an exterior door installation kit to install a garage door behind a recessed concrete pan seat:
First, place a shim under each jamb, squaring up the head jamb. Shim and nail or screw off the sides, then remove the bottom shims, leaving an 1/8" airspace. You can use AL shims, cedar shims, or plastic. Cedar shims are preferable to pine because they are more weather-resistant.
Next, install the door hinges provided by the manufacturer and secure them to the frame with the included hardware. Ensure that the door opens and closes properly. Then, remove two of the screws on the top hinge and replace them with long anchor screws that penetrate the framing members to strengthen the installation.
After that, anchor the moulding to the door frame with 10d galvanized nails every 12 inches, using a nail set to drive the nail heads below the surface of the wood.
Finally, seal the door with a heavy bead of sealant to ensure that no water comes in under the door. If you are using a sill pan, seal the pan with the recommended product.
By following these steps and using an exterior door installation kit, you can effectively install a garage door behind a recessed concrete pan seat, improving the curb appeal and functionality of your home.
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Cut the bottom panel at an angle
When installing a garage door on sloped concrete, one option is to cut the bottom panel of the door at an angle to sit flush. This can be done by cutting the panel to follow the angle of the slope, ensuring that the door will sit evenly and not have any gaps.
To do this, first take accurate measurements of the slope of the concrete and the desired height of the door. Mark out the cut line on the bottom panel, using a straight edge and a pencil to ensure a straight and accurate line. It is important to measure twice and cut once to ensure accuracy and avoid mistakes.
Use a saw suitable for the material of the door panel, such as a circular saw or jigsaw with the appropriate blade. If the door is metal, a metal-cutting blade will be required, and if it is wood, a wood-cutting blade will be needed. Cut along the marked line, taking care to follow the line accurately and not deviate from it. It may be helpful to clamp the panel securely to a workbench or sawhorses to ensure stability during cutting.
Once the panel is cut, it should be deburred and smoothed to remove any sharp edges or splinters, depending on the material. For metal, this may involve filing or grinding the edge, while for wood, sanding will suffice. Finally, the cut edge should be sealed or painted to protect it from the elements and prevent corrosion or rot.
It is important to note that cutting the bottom panel of a garage door may affect its structural integrity and warranty. It is recommended to consult a professional or the door manufacturer before proceeding with any modifications. Additionally, this solution may not be aesthetically pleasing, as the modified door may look unusual compared to standard garage doors.
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Custom bottom panels
If you're installing a garage door behind a recessed concrete pan seat, you may need to consider custom bottom panels for the doors. The panels should be made to incorporate the angle of the slope, and the overall panel height should not exceed the designed height. This means cutting back the door panel rather than extending it.
For metal doors, a sheet metal shop can help with fabrication. You can also contact the door manufacturer, who may be able to custom-make the bottom panels. For wooden doors, a millwork company may be able to help.
If you're handy with woodworking, you can make the panels yourself. One option is to cut the bottom panel at an angle to sit flush. You can also try flipping the top and bottom panels, so the top panel becomes the bottom one and vice versa. This method may not work due to the profiles between the panels, as the bottom edge must be the bottom edge for the door to close properly.
Another option is to cut a groove in the concrete that's 3" to nothing at the thickness of the panel, allowing the panel to lower into it. You could also consider adding a sill pan to ensure no water comes in under the door. This is especially important if there is standing water outside the door or if the outside concrete is not lower than the inside concrete.
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Cut a groove in the concrete
When installing a garage door, you may need to cut a groove in the concrete to ensure the door sits flush. This is particularly relevant if you are installing a door in a sloped concrete area or need to make room for a new garage door.
Before cutting into concrete, it is important to determine if there is any rebar or reinforcement within the concrete slab. You can do this by drilling a small hole to check for any obstructions. If there is reinforcement, you may need to cut around it or consult a professional.
To cut a groove in the concrete, you can use a concrete saw or a walk-behind concrete grinder, which can be rented from most equipment rental places. You will need to cut two parallel lines about 2-3 inches apart and then chip out the concrete between them. Alternatively, you can use a small jackhammer/chisel to remove sections of concrete. Ensure that you wear appropriate safety gear, including eye and ear protection, and take precautions to minimize dust.
If you are installing a door in a sloped concrete area, you may need to cut the bottom panel of the door at an angle to sit flush. This can be done by a metal shop for metal doors or a millwork company for wooden doors.
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Shim for plumb and level
Shimming is an important step in the process of installing a garage door. It ensures that the door is level and plumb, and prevents future issues such as sagging.
To begin the shimming process, place the door in the rough opening and check that it is centred. If the door is not level, you will need to make adjustments. Place shims in any gaps between the door casing and the framed opening. Use a hammer or mallet to gently tap the shim into place, and use a level to check that the door is moving toward plumb or level as desired. If one shim is not thick enough, tap another shim in right next to the first one, but face it in the opposite direction.
It is important to note that shims should be used in pairs. This is because shims are angled, and using a single shim can cause warping in the door frame over time. Make sure that you are pushing the shim in far enough—it needs to be placed correctly so that it can do its job. The shim should be held firmly in place by the weight of the door. If it is loose, it could cause the door to become uneven or misaligned.
Once the door is plumb and level, drive a nail or screw from the casing, directly through the shims and into the framing to secure it. Finally, use a utility knife to score the excess shim length and break it off.
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Frequently asked questions
The purpose of a sill pan is to prevent water from coming in under the door.
A sill pan is not always necessary, but it is recommended if there is standing water outside the door or if the outside concrete is at the same height as the garage pad.
You can use a heavy bead of sealant or create a slope by grinding the edge of the concrete slab to prevent water from pooling near the door.
One challenge is ensuring that the door is level. This may require cutting the bottom panel of the door at an angle or modifying the concrete slab by cutting a groove or adding a ramp.
