Model # 110049

Internet #100318681

Store SO SKU #143120

Pittsburgh Corning 12 in. x 12 in. x 4 in. Decora Glass Blocks (3-Pack)

Discontinued Pittsburgh Corning

12 in. x 12 in. x 4 in. Decora Glass Blocks (3-Pack)

  • Let's in light while still providing privacy
  • Ideal for use to achieve maximum light transmission
  • Offers a water tight window of light
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Frequently Bought Together

Product Overview

Pittsburgh Corning 12 in. x 12 in. x 4 in. Decora Glass Blocks (3-Pack) have trademark wavy undulations that allow for maximum light transmission with subtle visual distortions. They are designed for installation in straight panels that are supported on at least 3 sides. The 4 in. nominal thickness offers stability and durability.

  • Made in america
  • 100% Real glass
  • 4 in. thickness provides stability and durability
  • Designed for installation with straight panels supported on at least 3 sides
  • Non-directional faces for convenience of installation
  • 1.96 R-value
  • UL fire rated
  • Decora pattern allows maximum light transmission with subtle distortion
  • Note: Product may vary by store.



Product Depth (in.)
Product Height (in.)
Product Thickness (in.)
3.875 in
Product Width (in.)


Color Family
Insulation R-Value
Product Weight (lb.)
Thermal Conductivity in BTU
.51 Btu

Warranty / Certifications

Manufacturer Warranty
Pittsburgh Corning promises to replace any glass block that are found to be defective within five years from date of purchase.
UL Fire Rated

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Customer Questions & Answers

Just how "see through" are these glass blocks?

We want more natural light for an office, but if we move, the room is really intended as a bedroom so we need something fairly opaque. thanks, darci
Asked by: Darci
The Decora pattern is listed as a "medium privacy." The nearer to the face of the block you are, the more detail you can see. You can see an illustration of this by viewing the plant behind the three patterns at this link.
Answered by: PittsburghCorning
Date published: 2016-07-05

Privacy question

I will be converting a floor-to-ceiling exterior window to glass block in what will be my steam-shower room. I'd love to use the block with vertical lines (classier and more privacy), but it is more than double the price of this block (go figure). So with THIS block, my question is about its degree of privacy. If a person is showering about 16" away from a window with this particular glass block, would it provide adequate privacy? (Another property is about 20 feet away.) What if a person stood almost right against the block, does the privacy lesson? I'm not prudish... in fact a little risqué; but I'm thinking about houseguests who may be skittish about inadequate privacy. Hence my question.
Asked by: NicksMyNickname
If you put your hand (or anything else) on the glass, you can see it clearly from the other side. But if you stand away from the glass, and the viewer is further away as well, you can see only colors and possibly distorted shapes.
Answered by: HSHOBX
Date published: 2016-07-12

What is the exact dimensionof this 12" block. Are chanels and spacers available?

Asked by: Bert
The actual size of a 12x12x4" glass block is 11-3/4" x 11-3/4" x 3-7/8." The channel used with the 12x12x4" block is the Perimeter Channel Premiere Series. Use the 40" ProVantage Horizontal Spacer in horizontal joints. Cut the 40" ProVantage Horizontal Spacer to size (11-1/2") to create the Vertical Spacers.
Answered by: PittsburghCorning
Date published: 2016-03-25

How much does one 12"x12" glass block weigh?

Asked by: Anonymous
Per the product specs: 15.77 lb each
Answered by: HSHOBX
Date published: 2015-09-17
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Customer Reviews

12 in. x 12 in. x 4 in. Decora Glass Blocks (3-Pack) is rated 4.9 out of 5 by 12.
Rated 5 out of 5 by from Beautiful & solid We used these on an interior wall to bring a little natural light to a room which had none. Using a strong clear epoxy, we stacked them vertically to make 1'x3' windows. You can see through them but the wave adds just enough distortion to abscure the view from either side. We are very pleased with the outcome.
Date published: 2012-08-21
Rated 5 out of 5 by from great style i purchased and installed these blocks as replacements for eight ordinary i/8" window pane lites beside a front door. The upgrade is impressive and closely coordinates with the existing crinkled glass in the door itself and eliminates the need for interior sheers. The insulating ability of these sealed glass blocks are a plus as well. I am glad to see a return to these stylish items that were hugely popular throughout the 50's and 60's.
Date published: 2007-03-16
Rated 5 out of 5 by from Beautiful! We installed these in a staircase wall and they look beautiful! We were very glad the size was exactly as stated as we framed before we even had the blocks in hand - and they fit perfectly.
Date published: 2013-06-20
Rated 5 out of 5 by from product exactly what it should be this product is hard to find stocked in local stores so availability and quick shipping was helpful. I'll do it again.
Date published: 2011-05-28
Rated 5 out of 5 by from Great product I have bought this before but it is a terrific product that I hand etch images on for accents for bathrooms and lighted installations. Every block is identical, no surprises and arrived faster than expected.
Date published: 2016-07-12
Rated 5 out of 5 by from Beautiful I originally wanted clear blocks but these have the perfect contrast to the solid glass door they are encasing. Frames door even better than I imagined.
Date published: 2016-05-24
Rated 5 out of 5 by from Nice Bath Addition I bought 16 of these block in an icescapes design to add light above my whirlpool tub in the master bath. They look great! I especially like the design in the glass block. It provides the necessary privacy needed in the bath with the added natural light I love so much!
Date published: 2007-01-22
Rated 5 out of 5 by from Good product with many uses Very attractive product can be used in many ways: small or large window, shower enclosure etc. Anywhere you want to let additional light in for minimal cost.
Date published: 2012-02-28
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