This 70" long mount was too big for my mount cutter so I had to use a long metal rule and a hand bevel cutter that runs along a channel in the straight edge. The standard size for mountboard is 32" x 44", with a good selection of boards available in the 'Jumbo' size of 44" x 64". Over this size and the choice of mountboard is extremely limited, with only museum quality cotton board in a couple of colours. The board I used for this size of job was 48" x 72", in white. Although for even bigger jobs there are larger sizes available at 48" x 96" and 64" x 86". Above these sizes, or if colours other than white are required, then mountboards can be spliced together.
