Embodiments of a slot bar configured to secure one or more sheet materials are disclosed herein. The slot bar being configured to receive one or more retaining strips. The slot bar includes a base section and a first slot base extending substantially perpendicularly from the base section. The base section and first slot base define a first ledge region. The slot bar also includes a first slot wall extending from the first slot base and a first slot arm extending from the first slot wall. The first slot arm is also substantially parallel to and spatially disposed from the first slot base. The first slot base, the first slot wall, and the first slot arm define a first slot configured to receive the first retaining strip so as to secure a first sheet material between the first retaining strip and the first ledge region.