Zero Lot Line Construction

What is a Zero Lot Line House?

A zero lot line house is a piece of residential property where the house comes up or very near to the edge of the property line. Zero lot lines typically contain one side yard, whereas traditional houses include two side yards – one on either side of the house. A variety of properties can be considered zero lot lines, including town homes, garden homes, and row houses.

As builders face the challenge of the lack of available lot space, high-end zero lot line homes are becoming a popular niche market. Zero lot line homes are a cost-effective option for homeowners who are looking for low maintenance and simplicity in their next property.

Zero Lot Line Wall Construction

For an added safety and privacy measure, zero lot line homes restrict the addition of windows on either side. This limits the placement of windows to the front and back of the house.

Because property lines are much closer than that of traditional homes, zero lot line construction differs slightly. Safety becomes a major consideration, especially with wall construction. It is common to incorporate fire rated materials into construction to reduce the risk of fire transfer between homes.

What are Fire Ratings for Architecture?

Fire ratings for architectural components are assigned time increments determined during rigorous laboratory conditions. The rating indicates the length of time the material can resist heat before degrading and exposing interior objects. SEVES Glass Block from GBA is available with UL fire ratings of 45-, 60-, and 90-minute ratings.

According to, glass block is exposed to a propane gas-fired furnace for various periods according to procedures set by Underwriters Laboratories (UL) and The American Society for Testing and Materials Standard E119. The survival period determines the fire rating. Glass block that resists the fire’s impact for ninety minutes is thereby award a 90-minute rating.

Fire Rated Glass Block

Attractive, durable, energy-efficient, and capable of opening up dead and dark spaces, fire rated glass block is endowed with inherent fire-resistant properties. In many fire-safe buildings, fire rated glass block structural components furnish an additional level of safety that wood and drywall cannot.

Whether for interior walls, glass staircases, flooring, or exterior cladding and windows, structural fire rated glass block adds pleasing aesthetics and light while providing an added measure of fire protection. Fire rated glass block is available in a range of textures and degrees of transparency for privacy and safety.

How Safe is Fire Rated Glass Block?

SEVES Glass Block, the world’s leading glass block manufacturer for architecture and construction, produces fire resistant glass block in classes of 45-, 60-, and 90- minute fire resistance that retains structural stability and strength while protecting occupants and objects from flames, smoke, forcible entry, and dangerous gasses.

As part of their Technology Line, SEVES fire rated glass block is available from GBA Architectural Products + Services. Besides fire resistance, products in this group of state-of-the-art glass block products are noise resistant, graffiti resistant, bullet and projectile proof, and secure.

Style Combined with Safety

SEVES fire rated glass block is distributed by GBA Architectural Products + Services with ratings of 45-, 60-, and 90-minutes. These products, useful for both interior and exterior applications, are available in several sizes, designs, and styles to match any architect’s imagination.

SEVES Glass Block Design Options from GBA

SEVES glass block styles are available in wavy or smooth surfaces, with three different finishes for privacy and light control.

  • Premiere Series: The 45-minute fire rated glass block offers the most design options of patterns sizes and shapes. Patterns for Premiere are Nubio, Light-Diffusing, Large Gross, Clarity®, Cortina®, Regent®, and Arctic®.
  • Thickset® 60 Series: This 60-minute fire rated glass block option is thicker block than Premiere and offers reduced sound transmitting properties. The block is available in Nubio®, Clarity®, and Spray® patterns at a face thickness of 0.375”.
  • Thickset® 90 Series: Rated by UL at 90 minutes if fire resistance, this product is also available in a range of styles and is graded at a higher level of sound transmission. The nominal thickness is 3.75”. Styles available are Nubio®, Clarity®, and Endura®.
  • VistaBrik®: The ultimate in security and safety, VistaBrik is a full 3-inches thick yet allows as much natural light as desired while capable of deterring firearm projectiles, hurricane and tornado-force flying objects, and forcible entry. The product is available in a variety of styles and patterns.


Contact GBA Architectural Products +Services

For designers and builders seeking the perfect marriage of beauty, durability, energy efficiency, and safety, fire rated glass block from GBA Architectural Products + Services is a logical solution. Check out their array of world-class products for a variety of applications. If you are looking for a building material that will last, provide plenty of light, lower energy bills, impart beautiful, ever-changing light effects, and provide superior fire resistance, architectural glass block is the perfect option

For more information about the full range of glass architectural products, like sidewalk vault lights, visit the GBA website at View some of the incredible past architectural renderings supplied by the professionals at GBA.

If you have questions regarding the full range of applications of glass block products, contact the experts at GBA Architectural Products + Services at one of their three regional offices serving North America.

Here are the phone numbers to speak with one of the GBA professionals:

  • Midwest: (877)-280-7700
  • East Coast: (212)-255-5787
  • West Coast: (213)-634-7050

Or, you may complete the online questionnaire in the Contact Us section of the website and one of the GBA experts will contact you.

Tags: Fire Rated Glass Block, Glass Block