Tape Measure
Pencil or marker pen
Electric Screwdriver / Drill
6mm Drill Bit
IMPORTANT Please read through all instructions before beginning installation.

For the best results the surface should be smooth, flat, and devoid of any bumps or troughs. Remedial action should be undertaken to rectify uneven surfaces prior to fitting the Industrial Strength Aluminium Threshold Seal Kit 8mm (High). 

Always unpack your box and check the contents before commencing installation. 

For rough surfaces GaraDry adhesive & sealant should be used underneath the threshold seal to ensure a watertight seal. 

Step One 1

Prepare the installation area

Thoroughly sweep the installation area to remove any dust and debris prior to fitting.

Step Two 2

Choose the installation position

Choose an installation position


Position A

The threshold is installed between the door tracks.

Position B

The threshold is installed wall-to-wall behind the garage door tracks.

Position C

The threshold seal is installed slightly back from the door and mitred around the door tracks. This may be suitable if the door has an alarm sensor that cannot be removed.

Step Three 3

Measure the installation area

Based on the position you selected in Step 2:

a) Measure the width of the opening in between the door tracks

b) Measure the distance wall-to-wall

c) Measure around the door tracks, and the distance between the threshold seal fitting position and the wall

Step Four 4

Cutting the threshold to size

Based on the position you selected in Step 2:

a) Mark and cut the threshold to size to sit in between the door tracks (notch the seal around the tracks as shown)

b) Mark and cut the threshold to size to fit from wall-to-wall

c) If fitting the threshold seal around the door tracks, measure the distance between the wall and the back edge of the threshold seal and cut the end sections to this length. Using a mitre saw, cut the threshold seal sections accordingly.

Step Five 5

Insert the bottom seals

Turn the threshold section(s) upside down and insert the bottom seals into the grooves at either end of the threshold, and cut off any excess.

Step Six 6

Mark the drill holes

Return the threshold seal to an upright orientation and lay it into position across the opening.

Using a marker pen/pencil, mark where to drill the holes in the concrete.

Step Seven 7

Drill pilot holes in concrete

Remove the threshold, and using a 6mm drill bit, drill the holes for the screws.

Once completed, ensure the surface is brushed clean to remove debris.

Step Eight 8

Apply the adhesive (Optional)

In the case of the floor being uneven, lay a bed of adhesive underneath where the threshold seal is to be fitted to ensure a watertight seal.

With the threshold seal in position, mark along the front and back edge of the seal with a marker pen/pencil.

Remove the threshold seal and mark a line approx 10mm inside the existing lines, followed by a zig zag line in the middle of them.

Apply adhesive & sealant following the pencil lines created.

Step Nine 9

Lay the threshold

Place the threshold seal back into position.

Insert all the screws in their respective holes and hand tighten each of them, or use an electric screwdriver but do not tighten them fully.

Ensure that all screws fit snugly.

NOTE: There is no need to use plugs as the fixings have a cut thread design that enables them to be drilled into concrete.

Step Ten 10

Screw in place

Apply pressure to the threshold seal with your foot.

Using an electric screwdriver and T30 screwdriver bit, tighten the screws into place making sure they are flush but do not overtighten.

Step Eleven 11

Wipe seal clean

Wipe the surface of the threshold seal to remove any grease or dirt.

Step Twelve 12

Seal the edges

Depending on the fitting position of the threshold seal:

a) Apply sealant & adhesive around the edges of the threshold seal and the frame to ensure a watertight seal.

b) Apply sealant & adhesive around the edges of the threshold seal and the wall to ensure a watertight seal.

c) Apply adhesive and sealant in the mitre join of the threshold seal, and around the edges of the seal to ensure a watertight seal.

Step Thirteen 13

Test the threshold (Optional)

Using a bucket of water, or a hosepipe, test the threshold seal for water ingress.

If water enters underneath the threshold seal run a line of adhesive & sealant along the front and back edge of the seal.

Alternatively, unscrew the threshold seal and apply a bed of adhesive as per Step 8 of the instructions.