New! ThermGard TG50 Roof Glazing System

  • Wide Spans
  • Low Pitch
  • Non-Fragile

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Lonsdale Roofing

GlazaTherm Rooflight Ventilators & Conservatory Roof Vents


Rooflight Ventilators

Conservatory Roof Vents
​Our GlazaTherm ventilator goes through a 12 step manufacturing process to ensure weather tightness and durability you can rely on again and again.

Manufactured from thermally broken aluminium using the proven polyamide technique for maximum thermal performance, GlazaTherm provides a cost effective way of ventilating both commercial buildings and conservatories. A range of factory fitted opening mechanisms are available for both manual and electric operation for both day to day and smoke ventilation in accordance with EN12101. The external fixed frame is made to suit the adjacent glazing thickness which is usually 24 or 28mm, so our opening vent is as easy to fit as a double glazed unit into most sloped curtain walling, patent glazing, rooflight and conservatory systems down to 15 degree pitch. Below 15 degrees, we offer a factory silicone glazed version guaranteed to remain water-tight to 5 degrees.

“GlazaTherm Vents have proved extremely reliable on several high end domestic rooflight & conservatory projects” – Alan West, MD, Trombe Ltd


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Why is ventilation important?

Ventilation is vital in any indoor space, as a lack of it can encourage the breeding of mould and collection of condensation which can permanently damage any surface it comes into contact with. Additionally, air circulation can have your building feeling far less stuffy than it would otherwise, and give you a much-needed gust of fresh air. 

What are Glazatherm Roof Ventilators made of?

Glazatherm roof ventilators are made of thermally broken aluminium. Thermally broken aluminium enhances the thermal performance of your roof ventilators and will allow you to heat your building far more efficiently. 

How do Glazatherm Roof Ventilators open?

When it comes to opening your Glazatherm Roof Ventilators, you could choose a manual or electric opening mechanism, and include a remote cable if you so wish. We like to ensure flexibility with our roof ventilator options and all you need to do is enquire! 

Are they available in different colours?

Yes. All standard RAL and BS colours are available for our Glazatherm Roof Ventilators. If you’d like to find out more about the specific colours we offer, please don’t hesitate to contact us!