Thermosash Sloped Glazing System

Alpha Glazing

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Auckland

Wellington

Christchurch

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Product Description

The Thermosash Alpha Glazing System is a capped, skylight & atrium glazing bar system that can be installed to a minimum slope of 5 degrees. This design style of overhead glazing employs an aluminium extrusion that encapsulates a minimum of two edges that are then connected back to the primary structure.

The Thermosash Alpha Glazing Suite can be used externally for canopies or internally for skylights as a sophisticated and high-performance solution for all high-end sloped glazing applications. The system also offers an economical solution for factories, warehouses, hangers and grandstands.

Thermosash has extensive experience engineering, manufacturing and installing rooflights, atrium glazing and canopies for commercial buildings.

Engineering

Due to potential exposure to high wind, seismic, snow, and live loads etc, it is necessary for these types of systems to be specifically designed and engineered. The sophistication required of products used in overhead glazing can often be overlooked; special design features are required to cope with and overcome considerably higher water loadings, heat gain or loss (which introduces condensation) and in particular the risk associated with accommodating costly higher specification products (e.g. high performance laminated and insulated glass units) without compromising their product warranties.

Innovation and providing custom specific design solutions has always been the foundation on which Thermosash has developed its suites. Our growth has been influenced by constant research and development and being aware of overseas trends.

Overhead glazing configurations include:

Lean-to skylights
Ridge skylights
Double pitch skylights
Pyramid skylights
Multi-facetted pyramids
Hip ridge skylights
Segmented barrel vault skylights
Curved barrel vault skylights
Vertical glazing

Section Sizes: range of 55mm - 80mm

Integrated elements

Alpha Glazing System integrates with the Thermosash Delta Suite.
The Alpha range can incorporate opening sashes or banks of louvres - BMS operated if required.
Almost any type of glass can be incorporated including ceramic fritting to provide an element of solar shading or decorative motif.

Installation

Our Alpha Glazing System is site glazed. The frames are prefabricated in our factory and installed on site prior to glazing. We utilise our own experienced in-house installation teams to complete the work.

Maximum Spanning Ability

Glass size and primary structure support is your only limitation. We can source your specific glass requirements to meet your projects needs.

The spanning ability will vary depending on the structural system and environmental loads (e.g. wind). Thermosash specifically engineers the best suite options to meet project requirements.

Thermosash Suites are recognized as having the largest spanning systems on the market due to our specific engineering capability and the customised nature of the work we complete.

Warranty

The standard warranty is 10 years from the date of practical completion. This covers workmanship and weather tightness, providing the subcontract includes fabrication, installation and glazing of all components, and the maintenance schedule is adhered to.

Maintenance

Maintaining glass, metals and stone are all particular to the environment that they are placed in e.g. marine, environmental pollution, exposure to natural washing, etc.

It is recommended by almost all material suppliers that building washing should occur every 3-6 months to prevent staining to glass and prevent environmental pollutants from corroding metals and to maintain the material warranties.

A full maintenance manual is provided on completion of a project for all the elements integrated within a project. Compliance to a maintenance schedule is essential to maintaining the quality of the installed product over time. Using Thermosash-approved facade maintenance contractor/personnel ensures the highest standards are met.

Key Features

Alpha glazing suite integrates with the Thermosash Delta Suite.

Can be installed to a minimum slope of 5^o

Integral drainage cavities.

Commercial glazing engagements to cope with higher wind loads.

Condensation control (where specified).

Thermally broken.

Ability to provide a different colour from inside to outside.

Can accommodate all recognized glass thicknesses used in commercial glazing.

Special splicing and connection features critical for weathering.

Almost any type of glass can be incorporated including ceramic fritting to provide an element of solar shading corporate motif.

The Alpha range can incorporate opening sashes or banks of louvres - BMS operated if required.

The Alpha systems are dry glazed unless aesthetically otherwise required.

Bars are designed to accommodate co-extruded backing gaskets to minimise long term shrinkage problems.

Glass is retained with gaskets fitted inside and out, primarily as a weather seal, but also to cushion against vibration and potential glass breakage.

Minimum construction R-value values as relevant to product selection

Brochures

Alpha Glazing System Product Disclosure - Documents Package

2026

Thermosash Rooflights & Atriums - Thermosash Alpha Glazing Suite - Brochure

September 2025

Specification

We recommend using Masterspec branded sections for specifying:

4521TS Thermosash Commercial Windows & Doors for over 50 deg. slope.

4211TS Thermosash Curtain Walling

CAD Downloads

Alpha Glazing Bar - Single & Double Glazed

Download Files

Finishes

Polyester powdercoat - both standard and special colours available
Anodised - all anodised colours available - commercial grade 20 Micron finish recommended
PVF2 Fluorocarbon finishes - available on request