What is the cost of a Glass Block unit?

The price of a unit of glass block will vary by region, location and supplier. Manufacturer's Suggested Retail Prices for the most popular sizes and patters can be found by clicking here. Check with your local supplier for actual prices.

What is the actual versus nominal size of ThinlineT and Premiere Series Glass Block?

ThinlineT Series block which is often called 3" block has an actual thickness of 3-1/8". Actual width and height dimensions are ¼ " undersized to allow for application of mortar or silicone. Example: 8"x8"x3" nominal equals 7-3/4" x 7-3/4" x 3-1/8".

Premiere Series block (4" nominal thickness) has an actual thickness of 3-7/8". Like the ThinlineT Series, actual width and height are ¼" undersized. Example: 6"x8"x4" nominal equals 5-3/4" x 7-3/4" x 3-7/8".

What are other differences between the ThinlineT Series and Premiere Series glass block?

Premiere Series

  • 4" thickness (nominal) provides extra stability and durability
  • Greatest selection of patterns, sizes, and finishing units
  • Highest insulation, sound transmission and fire resistance ratings
  • Recommended for curved and shower walls
  • Suitable for interior walls up to 250 square feet and exterior walls up to 144 square feet using the Mortar II installation method
  • Can be installed using either the ProVantageT Installation System, mortar method or KWiK'N EZ® Rigid Track System.

ThinlineT Series

  • 3" thick (nominal) block is a popular residential series
  • Limited patterns and sizes available.
  • Only finishing unit available for ThinlineT is 4"x8" EndBlock (Decora Pattern)
  • Economical
  • Ideal for windows and non-curved walls
  • Can be installed using only the mortar system.
  • Mortar One Installation: Interior and exterior pannels up to 25 square feet.
  • Mortar Two Installation: Interior panels up to 150 square feet and exterior panels up to 85 square feet

Can I use Premiere Finishing Units like Hedron, Tridron, Encurve or 8" x 8"x 4" EndBlock with ThinlineT Series glass block?

This is generally not recommended; the excess difference in thickness of ¾ " is noticeable and unsightly.

Is glass block load-bearing?

Glass Block is a non-load bearing material. Provisions (i.e., lintels) at the head should be provided to accommodate the support of loads above the glass block panel (similar to doors and windows).

What is the R-value of glass block?

The R-value for Premiere Series glass block is 1.96, which is more than twice the value for flat 1/8" sheet glass windows or roughly equivalent to a double pane thermal window. The ThinlineT Series R-values are slightly lower at 1.75.

What is the warranty for glass block?

Limited five-year warranty against manufacturing defects and loss of insulating value. Contact Pittsburgh Corning for details.


  Glass Block Sales, Inc.  24500 Forterra  Warren, MI  48089  1-586-754-0510  1-800-774-7070 Phone  1-586-754-6623 Fax