Complete Buyers Guide On Choosing The Correct Garage Door Threshold

Garadry Weatherstrip Guide

The Problem

Rainwater that comes underneath your garage door can damage the contents of your garage, and well a proving a nuisance to clean out after every storm or heavy rainfall.

Water can soak through boxes damaging the contents inside as well as creating a damp atmosphere leading to rusting of vehicles, tools and appliances which can be an expensive problem to rectify.

Choosing the correct seal for you garage door is very simple and can be done in a few easy steps outlined in the helpful guide below.

What are the Garage Door Seals and how do they work.

All our seals prevent leaves, dust or sand, debris and vermin from entering the garage as well as protect against drafts, wind-blown rainwater, standing water, cold air and snow.

Our flood barrier is also available if you have a large amount of standing water.

The seals are completely watertight when fitted with our adhesive and serve as a superior alternative to rubber as our products are 100% recyclable making them environmentally friendly, odorless and will not rot, decay or lose their color with prolonged exposure to water or sunlight.

The seals prevent vermin such as small reptiles like snakes, mice or rats, spiders, or other insects from entering through the gap under your garage door.

How is the seal fitted?

The threshold fits behind the garage door to ensure that a tight seal is formed when the garage door is in the closed position.

Our garage door thresholds were designed with you in mind. Anyone with basic DIY skills will be able to fit our range of seals. The seals come in a variety of lengths and heights and are made with either aluminum or flexible thermoplastic material.

how it works

Domestic garage door threshold

Commercial garage door threshold

Choosing the correct height

To find the correct size of threshold for your garage, all you need to do is measure the gap between the bottom of the garage door and the floor in a number of different places then note the largest measurement. As your floor is unlikely to be completely level you should measure the gap in at least three or four places to ensure you determine the largest gap.

Measure the gap underneath the door

Measure the gap (between the bottom of the door and the floor)

If the largest gap between your garage door and floor is 0.7" - the 3/4" Garage Door Seal will be just right for you (please note that if the highest gap is the same height as one of our seals you will need to go one size up to ensure an effective seal). If you want a larger seal you can go as high as you want, but not lower.

Product range:

0.59 Threshold Seal
0.78 Threshold Seal
0.98 Threshold Seal
0.98 Ramp Threshold Seal
1.18 Threshold Seal
1.57 Flood Barrier
0.59 Commercial Threshold
0.98 Commercial Threshold

What if the garage floor is uneven and not level?

The Garadry Ramp Design seal was made specifically with this in mind. If the gap between your garage door and uneven floor is less than 1" as its largest, the 1" Ramp Design Garage Door Threshold Seal will do the job for sloping floors.

Measure the gap (between the bottom of the door and the floor)

When faced with a particularly uneven floor it is recommended that you use the 1" Ramp Design Garage Door Threshold seal.

If this isn't high enough, the 1 1/2" Flood Barrier/ Flood Diverter will also work on uneven or sloping surfaces. if you have an uneven floor but would like an aluminum threshold, an effective seal can be achieved with adequate preparation of the floor.

Garage door with uneven gap

Choosing the correct length

To find the perfect length of garage door seal for your garage door you will need to measure the width of the opening, or wall-to-wall as required.

measure width

Measure the door opening width

If the width of your garage door is 9'0" you would select the 10'3" long Garage Door Threshold Seal.

The thresholds can easily be cut to size with a pair of scissors or a hacksaw depending on the threshold material.

For maximum protection we recommend installing the threshold wall-to-wall and notch the threshold to sit around the frame.

If your door has a small gap underneath, the threshold should be installed wall-to-wall as below image.

Fitting the threshold wall to wallWall to wall fitting
Fitting the threshold wall to wallFitted around door frame


Creates a Water Tight Seal

In order to create a watertight seal, the threshold should be cut to fit the door frame or channel. This can easily be achieved with a hacksaw, box-cutter or sharp scissors. Position the seal so that is fits snugly behind the door and then mark where the threshold will need to be cut in order to fit the door frame/channel. This will prevent water and debris from entering around the sides of the door and ensure the garage remains clean and dry.

The hump of the threshold fits behind the garage door so that no adjustments to the door are required.

measure width

Consult the Weight Guide

The weight guide below briefly demonstrates the difference in strength and usuability of the 'domestic' and ' commercial' garage door threshold seals.
*Note: This is a guideline only as actual vehicle weight may vary considerably.

If you are still unsure you can contact us at[email protected] or call 281-886-8691 between 9AM - 5PM EST.

weight guide

Additional Information

Alternate Uses

While our seal strips were specifically made for sealing the gap under your garage door, some of our customers have found very innovative ways to make use of them outside of sealing their garage. These include:

Using the seal to contain spills - The seals are chemical and oil resistant and could be used to manage spilling to an extent.

Using the seal as a flood diverter - Placing the seals across your gate, driveway or premises to divert water.

flood diverter
flood diverter
flood diverter

Fitting Guides

Fitting Instructions are shipped with each product, additionally you can find fitting instructions on our website or YouTube page.