Abstract: An adjustable attachment device for building materials comprises a first U-shaped engagement structure and a second U-shaped engagement structure that is attached to a leg of the first U-shaped engagement structure. The second U-shaped engagement structure is at least one of pivotably attached to the leg of the first U-shaped engagement structure and translatably attached to the leg of the first U-shaped engagement structure. A central portion of the second U-shaped engagement structure is attached to the leg of the first U-shaped engagement structure. The first U-shaped engagement structure is adjustable between a first position whereby a respective channel of the first U-shaped engagement structure and a respective channel of the second U-shaped engagement structure extends generally parallel with a first reference axis and a second position whereby the respective channel of the second U-shaped engagement structure extends generally perpendicular to the first reference axis.