Internal grids, also known as muntin bars, are the strips of material between the glass. External grids, also known as SDL’s, are mounted to the exterior of the glass.

We offer a variety of styles and colours.

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Thermoproof, positive.

  • If I require further window services I will use Thermoproof. I am a happy customer & appreciate excellent service.

  • We love that you build your product locally and that you back it with exceptional service, and accordingly we will absolutely recommend Thermoproof to anyone asking about windows.