Board is the skeleton of everything you build. Its thickness and quality are what give your album body, keep the covers from warping and hold the shape of boxes and chests over time.
We work with grey laminated board in 1.5 mm and 2 mm at 30.5x30.5 cm, lightweight board singly and in packs of 12, and chipboards pre-cut in various sizes and shapes.
As a rule of thumb: 1.5 mm works well for medium-sized albums and internal structures, and 2 mm for the covers of large albums, boxes and anything that's going to be handled a lot.