Glazing & Glass Information

A swatch showing samples of the different glazing on offer from RB WindowsNew and Improved Glazing

With our triple glazing and Planitherm 4s glass

Our warmest window ever

  • More Efficient
  • Reduce Noise Levels
  • Added Security




RB Windows can reduce your carbon footprint and your energy bills. The glazing in our products have excellent U-Value ratings, efficiently keeping heat in your home. Our products are also packed full of clever features such as being made from 100% recycled materials keeping in more heat, and advanced glass that can reflect heat back in to your home.

All of our units are glazed with Planitherm glass. What is Planitherm? PLANITHERM is Europe’s leading energy saving window glass and is the most efficient glazing available. It uses advanced coating technology to reflect radiated heat back into the room, rather than allowing it to escape through the windows. At the same time, PLANITHERM captures warmth from natural daylight by allowing it to pass through the glass. PLANITHERM offers a range of products so we can tailor your energy efficient glazing solution to your home.

Standard C Rated

Our standard C Rated glass is made up of a 4mm Planitherm glass, with a 4mm clear glass with aluminium spacer bar. It has a u-value of 1.5w/m2K meaning this unit will ensure to keep warmth and comfort inside your home.

A Rating

Our A Rated glass is made up of a 4mm Planitherm as well as a 4mm clear but is made up with a super spacer-argos filled. Meaning there is no chance of any heat loss through the units. Super Spacer introduces no-metal warm edge technology to windows, helping to deliver windows of the highest standards. Super Spacer® is a no-metal, pre-desiccated, structural foam spacer system. It has a u-value of 1.4w/m2K meaning a unit with this kind of glazing will ensure to keep warmth and comfort inside your home.

Triple Glazing

Triple Glazing has an excellent level of thermal efficiency as well a reduction in noise levels, allowing your windows to keep heat in during the night and day and giving you maximum comfort. Having this level of solar heat gain will mean your windows will exceed the current maximum energy rating of an A Rated window.

Triple glazing is made up of 4mm Planitherm & two 4mm clear pains of glass, with super space bar-argon filled.


  • Maximum comfort
  • Enhanced Security
  • Use Less energy
  • Save on heating bills
  • Drastically reduces noise levels
  • Energy Rating A Windows
  • Low U Value of 0.9W/m2K

Planitherm 4S Glass

Planitherm 4s glass is designed for an all year round thermal control, keeping you warmer in the winter and cooler in the summer. It is designed with heat reflection in mind and is the new leading glass in the market.

BenefitsWindow glazing energ ratings

  • Maximum comfort                                                                                                 
  • Enhanced Security
  • Use Less energy
  • Save on heating bills
  • 57% heat reflection
  • 63% less heat loss compared to ordinary double-glazing
  • Energy Rating A Windows
  • Low U Value of 1.0W/m2k
  • Almost eliminates internal condensation


Replacing the heat lost through your windows can be expensive so don’t throw your money out of the window! Install low emissivity (low-e) energy-efficient windows to help to reduce your heating bills by up to 20% each year.

You can also take satisfaction in the fact that it is not only money you are saving. Using a product from our energy-efficient glass range in your windows will reduce your home’s CO2 output, making your carbon footprint smaller and your home more environmentally friendly.

We offer a range of low-e energy-efficient glazing to suit every type of property, from a modern home to an older traditional styled home.