Fasteners - generally refer to mechanical installation
techniques for slate panels on vertical installations. Stainless
steel is recommended for exterior installations. A minimum of four
(4) anchors per stone up to twelve (12) square feet in area is recommended,
with two (2) additional anchors for every additional eight (8) square
feet in area. Weight, wind load, shear factors, etc. should be considered
to determine the size and number of mechanical anchors.
- Relieving angles are recommended at each "story"
height and over any window or door opening. Weep holes should be
considered at vertical joints to allow any water infiltration to
drain. When using continuous relieving angles, it may be advantageous
to drill the angle for weep purposes. Relieving angles support the
weight of the stone by supporting either the bottom of the panel
or a stone liner attached to the back of the panel.
Dowels - Dowels
are usually used at vertical / horizontal joints between panels
to align the panels and maintain the proper distance between the
panel and backup structure. Dowels should not be used to support
Tie-backs - Tie-backs
are usually threaded rods or eye-type bolts which attach to the
steel structure with washers and nuts. The un-threaded ends are
sometimes "turned" into a dowel hole or an "eye"
to engage a dowel pin.