Quality Laminate Countertops

Mal-O-Sen Co., Inc.

Durable Elegance

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Laminate Countertop Miter

The mitre is a pre-cut angle on the end on a countertop. The two most common angles used are 45° and 22-1/2°. Two 45° angles create a 90° miter corner and two 22-1/2° create a 45° miter corner.

The miter sections also have a mortise (Fig.1) cut into the under side of the countertop to fit miter bolts (Fig.2). Miter bolts fasten the left and right miter sections together. A spline (Fig. 3) can be ordered as an option. The spline is a thick piece of laminate that is to be glued into a slot that is routed into the edge of each miter section (Fig.4). Splines help to level the seam because of the tight fit between the spline and the routed slot.

You should dry fit the countertops on cabinets. Countertops should be scribed to wall before joining sections (see scribing section page in 'DIY Help'). Exception would be if one leg of the miter is short, usually not longer than 48". Things to consider are accessibility, weight of assembled tops, number of people to help lift into place. Also check for correct lengths, overhangs, end caps, and overall appearance before proceeding.

Tools needed are; saw horses (min. 3, all the same height), 7/16" open end wrench, hammer.

Supplies needed are; miter bolts, spline material (if ordered as option), small thin piece of wood approx. 1/4" - 3/4"(T) X 2"(L) X 2"(W), water proof wood glue, caulk or colored seam fill, cardboard or drop cloth to catch glue squeeze-out that drips to floor, and wet rag to wipe excess glue from surface of miter joint.

How to Assemble Miter

Click on images to enlarge.

Photo showing mortise cut outs and miter bolts on underside of countertop. Fig 1

Photo of miter bolt used to join two miter sections of countertop. Fig 2

Photo of spline material Fig 3

Photo of slot routed in in edge of countertop miter section. Fig 4

Photo of spline placed inside 1/2 of a laminate countertop miter section Fig 5

Photo of laminate countertop miter seam being leveled using wood block and hammer. Fig 6