How to Measure Your Arch Size 

Measure Width Top

Place the tape measure from the front edge of one door jamb to the front edge of the opposite door jamb, keeping it straight and level across the doorway. Alternatively, you could place it on the floor, lying across the jamb, to give a straight measurement. 

Picture A

For an 800 mm opening, the arch's appearance depends on the sizes of the two corner curves.

If we use 350 mm corner arches on each side, (including 5cm transition pieces)there will be a small 80 mm flat section at the top that you can use transition pieces This gives the arch a softer, curved look while still keeping a short, straight section in the middle.We may suggest a size in the purchase section, but alternatively, it's up to the customer to choose what arch size they want. 

Picture B 

Thickness of Arch 

We will do the math for you. Don't worry, we only need your width and depth dimensions.

If you want to know how we calculate it, use this example 

For example, if your jamb is 110 mm,

you will receive 100 mm crossbeams  2 x 4 mm arches (8mm), and Packers to make up the remaining gap. See below 

Measure the width of your jamb, as shown above.

For example, if your jamb is 100 mm wide, you will receive:

90 mm timber bridges
Two 4 mm arches, making 8 mm in total
The Packers to make up the remaining gap

However, if you are using plaster, you will need to allow an additional 1 cm on each side. In this case, the timber cross beams will be 70 mm wide.