Garage Door Bottom Seal Types
Many garage door bottom seal types exist on overhead door systems. The rubber seal on the bottom section of your garage door is known as astragal or bottom seal. Many different sizes, colors and types exist in the garage door industry. Matching the type and size of seal to the garage door you currently have is important. Every type of garage door my have a special style of bottom weather seal. Proper fitting bottom seal will keep out the elements and help insulate climate controlled garages. A few main types of garage door weather-seal will fit on most garage doors.
Garage Door Bottom Seal Types
Six main garage door bottom seal types exist with double channel retainer T type seal being the most widely used. Beaded seal, bulb seal and wood door bottom seal are the three most expensive types of seals because they are rarely used.
Much like T-type seal, beaded seal uses a dual channel aluminum retainer for installation. Beaded seal is designed for retainer pieces that have small circular channels. Beaded bottom seal is used in residential applications only and is generally found on older style doors. It is also found in lengths of 3-5 inches long.
The most common type of garage door bottom seal in the industry is t-type seal. Each side of the seal forms the letter “T’ which allows the seal to slide into the bottom aluminum retainer of the garage door. Most garage door manufacturers use t-type seal because it is both durable and easy to install. The seal easily slides into the channel of the bottom retainer, folding over the ends for an even tighter air barrier. T-type bottom seal can be used for both commercial and residential doors. The most common sizes are 3.5 and 5 inches wide. Standard widths range from 3.5 to 3.75 inch , while sites with uneven floors may need 4.75 inch width to seal properly. While bottom seals keep out most insects, leaves and other debris it won’t be waterproof.
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J- Type Seal
While most seals utilize dual channels for installation, J-type astragal uses one channel. The seal looks like the letter “J” at each end can be installed in a single channel. The hook ends of the J-type seal face opposite each other to anchor the seal in the aluminum retainer. This type of seal folds in half and runs side by side the length of the retainer. J-type seal is most commonly used in residential applications, coming in 3.5-inch and 5-inch widths.
Bottom seal that looks like a circle from the side with one small “T” shaped end is called bulb seal. It uses a single channel aluminum retainer channel for installation. The single T shape attached to the bulb slides down a single channel and compresses down when the garage door closes. Bulb seal is strictly for residential applications and comes in a variety of sizes and colors.
Wood Door Seal
Doors made out of wood usually lack an aluminum retainer strip at the bottom of the door. These doors require a specially designed wood seal that has a unique shape. Using square cap nails or screws the sloped “L” shaped seal is installed into the bottom of the door. Wood seal is made of a rubber compound and is used exclusively on residential wood doors.
A special type of seal known as threshold seal can be installed directly to your garage door floor. Threshold seal has a lip on the top side and groves on the back side where it adheres to concrete. Commercial grade adhesive products like Liquid Nails can be used to glue the seal to the floor. Threshold seal is a great way to keep rain, wind and small animals out of your garage – also adding much needed insulation to your garage.