How to install fire-rated glass floor systems in interior applications
The following guidelines provide basic instructions for installing fire-rated glass floor systems in interior applications. As with any specialty glass and framing system, product nuances vary by manufacturer. Consult the supplier's documentation for specific installation instructions.
The rendering illustrates a fire-rated glass floor system's components.
1. Prepare the structural opening
Verify placement of joists and perimeter conditions according to the approved project drawings. Next, prepare the perimeter by removing debris and applying any required perimeter sealants or other waterproofing.
2. Install anchor blocks, joists and desiccant
Consult the supplied project drawings to determine the recommended method for securing the anchor blocks to the surrounding structure.
Then, install the primary joists, desiccant and secondary joists. Before installing the fixing screws, check to make sure all openings and framing are square and straight. All screws should be hand tightened until snug. Avoid over-tightening.
3. Gasket and seal
Apply a silicone-compatible sealant where the joints and silicone gasket meet. This will typically be at the top and bottom of each joist. Then, install a bead of silicone at each joist intersection. This will help create an airtight chamber free of internal moisture.
4. Install fire-resistant-rated glazing
Before installing fire-resistant-rated glazing, check to ensure fire and heat blocking materials, such as intumescent tape, are in place.
Next, install perimeter spacers around the outside of the system. As fire-resistant-rated glass is typically heavy, this helps ensure even glazing pressure on the glass and aids in preventing glass breakage.
Once the perimeter spacing and temporary bars have been set, install the pressure bars with the supplied mounting nuts. While the nuts need to be tight enough to create a seal between the glass and silicone gasket on the joist beams, take care to not overtighten them to avoid glass breakage.
After all pressure plates have been installed, use the supplier's recommended fire barrier caulk and insulation plugs to fill holes in the pressure bars.
5. Install top surface glazing
The top surface glazing typically can be made up of one or two parts. If it consists of two components—a structural layer and a walking surface layer—glaze the structural layer first. Start by ensuring the silicone gasket is clean and clear of errant material. Place the structural glass onto the gasket, keeping an even joint between all glass pieces.
A fire-rated glass floor system's walking surface can provide slip resistance, while protecting the structural layer from damage.
Next, place the walking surface onto the structural layer. If it includes a frit or other non-slip surface, check to make sure it is face-up and that any patterns are oriented correctly. Lastly, seal the gaps between the glass with silicone, tooling silicone into the gap.