Complete Buyers Guide

For Choosing The Best Garage Door Threshold

What are garage door thresholds and how do they work?

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

Our garage door 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, odourless and will not rot, decay or lose their colour with prolonged exposure to water or sunlight.

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

How is the threshold seal fitted?

The garage door thresholds are designed to fit behind the garage door to ensure that a tight seal is formed when the garage door is in the closed position, with the edges notched around the frame of the door to prevent water ingress.

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 aluminium or flexible thermoplastic material.

how it works

Domestic garage door threshold

Commercial garage door threshold

Choosing the correct height of threshold

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.

If, for example, the largest gap between your garage door and floor is 18mm, then 20mm 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.

Uneven Floors

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 25mm as its largest, the 25mm Ramp Design Garage Door Threshold Seal will do the job.

If this isn't high enough, the 40mm Flood Barrier/ Flood Diverter will also work on uneven or sloping surfaces. if you have an uneven floor but would like an aluminium threshold, an effective seal can be achieved with adequate preparation of the floor.

measure gap

measure gap

Choosing the correct length of threshold

To find the perfect length of garage door seal for your garage door you will need to measure the width of the opening.

You would need to select a length of threshold allowing some overlap so that the seal can be fitted around the frame at the side of the door. Usually an excess of 3" (1 1/2" either side) is sufficient for this.

Creating a water tight seal

The threshold seal should be notched so that it fits snugly around the door frame and prevents water ingress. Seals can easily be cut with a sharp knife, pair of scissors or a hacksaw.

Depending on the size of the gap underneath the door, and the height of the seal selected, will affect how much of the seal will be fitted underneath the door, and therefore how much of the seal will need to be cut away to fit around the door frame.

measure width

measure width

Consult the weight guide

weight guide


Product range

15mm Threshold Seal
20mm Threshold Seal
25mm Threshold Seal
25mm Ramp Threshold Seal
30mm Threshold Seal
40mm Flood Barrier
15mm Commercial Threshold Seal
25mm commercial threshold