Venting Glass Block

Glass block is a masonry product that not meant to be vented but can be with special vent accessories.

Todays vents are plastic.  They typically take up the same space as two or three of the glass blocks.  What homeowners need to consider are the pros and cons of vents.  Let’s explore:


  • You get a small amount of air into the basement.  After the size of the frame of the vent and the openable (sash) of the vent, the amount of net air is very limited.


  • Vents are plastic.  Vents used to be made out of metal.  The metal vents were durable, but leaky and they conducted cold which is a big problem in northern climates.
  • Plastic breaks and cracks.  They reduce the durability of a glass block window.
  • Hinges attached to plastic are weak points.
  • Actual ventilation (air) from the outside is limited.
  • Before making the decision to add a vent, ask yourself when was the last time you actually opened your basement windows.  If the answer is never, then skip the vents.
  • If the humidity and heat outside meet a basement window in a cooler basement, it will condensate and basements that otherwise may not have had moisture, can start to have problems.

So why do companies even offer vents?  It’s because people request them and companies need to be able to offer what their customers demand, even if the customer took bad advice.



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