What Contractors Should Know Before Ordering Custom Fabricated Glass
Ordering custom fabricated glass requires more information than providing a width and height. The fabricator must understand how the glass will be used, supported and installed before selecting the thickness, safety treatment, edge finish and required processing. Holes, notches, cutouts, coatings and hardware locations must also be confirmed before production because many details cannot be changed after the glass has been tempered or assembled into an insulated unit.
A complete and coordinated order reduces remakes, installation delays and questions at the jobsite. Contractors should establish a reliable source of dimensions, identify the applicable drawings and confirm all fabrication requirements before releasing custom glass for production.
Explain the Glass Application First
Begin by telling the fabricator where the glass will be installed and what function it will perform. A storefront panel, shower door, office partition, railing infill, shelf, tabletop and insulated exterior window may require completely different glass make-ups. The application helps determine whether the panel needs tempering, laminating, edge polishing, insulating or another form of processing.
A provider offering comprehensive fabrication services can review the relationship between the glass, framing, hardware and installation method. Giving the fabricator sufficient context is more reliable than selecting a product based only on appearance or a previous order from an unrelated application.
Establish the Correct Source of Dimensions
The order should identify whether dimensions come from architectural drawings, approved shop drawings, an existing panel, a field survey or a physical template. These sources are not automatically interchangeable. Construction openings can vary from design dimensions, and an existing panel may include clearances that are not visible when measured inside the frame.
Contractors should confirm who is responsible for the final dimensions and when the surrounding construction will be ready for measurement. If field conditions have not been verified, the order should not be described as ready for fabrication. A small dimensional error can make custom glass unusable because tempered and laminated products cannot simply be trimmed at the jobsite.
Review Drawings, Schedules and Specifications Together
Commercial orders should be checked against the complete project documents. Floor plans show location, elevations show overall arrangement, sections explain frame depth and support conditions, and schedules identify glass or hardware requirements. Addenda and approved substitutions may contain more current information than the original drawings.
The Daltex guide to glazing takeoffs explains why commercial quantities and specifications cannot be confirmed from floor plans alone. Contractors should reference the relevant opening, elevation or mark number on the purchase order so that each panel can be connected to its intended location.
Specify the Complete Glass Make-Up
The order should state the glass type, nominal thickness, finished dimensions and required safety treatment. Depending on the application, this may include clear, tinted, low-iron, patterned, reflective, tempered, heat-strengthened or laminated glass. Descriptions such as “standard clear glass” are not specific enough for many commercial or architectural projects.
Laminated glass requires confirmation of the individual lite thicknesses, interlayer and overall construction. Insulated glass requires the pane make-up, cavity width, overall thickness, spacer, coating, gas fill and edge-seal requirements. The required unit must be described as a complete assembly rather than as separate pieces of glass.
Finalize Every Hole, Notch and Cutout
All holes, notches and cutouts should be dimensioned from clearly identified reference edges. The drawing should show their size, location and relationship to nearby glass edges. Hardware templates are often more dependable than measurements taken from a product photograph or an existing component of uncertain model.
Fabrication must be completed before tempering. Tempered glass cannot be safely drilled, cut or notched after heat treatment, so a missing hole usually requires an entirely new panel. Contractors should coordinate hinges, clamps, handles, locks, patch fittings, outlets and other penetrations before approving the glass for production.
Coordinate Glass With Hardware
Hardware selection should be completed before the glass is ordered. Hinges, clamps, patch fittings, standoffs and handles may require specific hole diameters, notch shapes, edge distances and glass thicknesses. Similar-looking products from different manufacturers can use different fabrication patterns, making assumptions risky.
Provide manufacturer drawings, templates and model numbers whenever possible. For systems such as storefront glazing, the glass must also match the framing pocket, gaskets, setting blocks and required clearances. Coordinating these components before production is less expensive than modifying hardware or remanufacturing glass later.
Confirm Edgework and Corner Details
Edge finish should be selected according to how the panel will be installed and whether the edge will remain visible. Seamed edges receive basic treatment to remove sharpness and are generally intended for concealed applications. Flat-polished edges create a smooth finished appearance, while beveled edges introduce an angled decorative border.
Exposed corners may require a specified radius, clipped corner or another treatment. The drawing should identify which edges receive processing rather than assuming that all sides are the same. Daltex’s custom-cut glass services include shapes, templates, polished edges, beveled edges, holes and cutouts for architectural and specialty applications.
Use Templates for Irregular Shapes
A physical template is often the most reliable way to order curved, angled or irregular glass. Written dimensions may not capture uneven walls, existing openings or subtle shape changes accurately. The template should be made from stable material and clearly marked with the finished size, orientation, room side and any required edge processing.
Avoid creating a template from flexible material that can stretch or distort during handling. The contractor should also confirm whether the fabricator will manufacture to the outside edge of the template or apply a specified deduction. These details prevent uncertainty when the glass must fit within a tight opening.
Specify Coatings, Tints and Surface Orientation
Coated and tinted glass should be identified by product, appearance and required orientation. Low-E coatings may need to face a specific surface inside an insulated unit, while reflective or decorative treatments may require a defined interior and exterior side. Incorrect orientation can affect both performance and appearance.
When replacement panels must match existing glazing, provide photographs and available product information. An exact match may not always be possible when the original glass is old or discontinued. Reviewing a sample before ordering a large quantity can help the project team evaluate color, reflectivity and visible-light differences.
Provide Complete IGU Information
Custom insulated glass units require more than finished width and height. The fabricator needs the individual pane types, overall thickness, spacer dimensions, spacer color, gas fill, coating position and any safety-glazing requirements. Edge-seal compatibility may also matter when the unit will be installed with structural silicone or another specialized glazing material.
The manufacturing process for commercial IGUs includes glass preparation, spacer assembly, cavity filling, perimeter sealing and inspection. Changing the make-up after production has started may require the unit to be remanufactured, so every component should be approved before release.
Define Fabrication Tolerances and Clearances
The glass should not be ordered at the exact size of a frame pocket or construction opening without allowing appropriate clearance. Glass edges need space for installation, movement, setting blocks and glazing materials. Insufficient clearance can create edge contact and stress, while excessive clearance may reduce retention or make the panel difficult to position.
Required deductions depend on the framing system, glass type, panel size and installation method. Contractors should follow the system manufacturer’s requirements or obtain guidance from the glazing professional rather than applying one standard deduction to every project.
Plan Identification, Packaging and Delivery
Large commercial orders should include a labeling system connected to elevations, rooms or opening numbers. Clear identification helps installers locate the correct panel without repeatedly unpacking and measuring glass at the jobsite. Labels should remain understandable even when several panels have similar dimensions.
Discuss rack requirements, delivery access, unloading responsibility and installation sequence before shipment. Delivering all glass at once may create unnecessary storage and damage risk on an active construction site. Phased deliveries can align material with the installation schedule and keep fragile panels away from unfinished work areas.
Review the Order Before Releasing It
A final review should confirm quantities, dimensions, glass make-up, edgework, holes, notches, orientation, labeling and delivery requirements. Any revised drawing should carry a clear revision number and date so that outdated information is not used accidentally. Verbal changes should be documented before fabrication begins.
The contractor should also confirm lead time and the point after which changes or cancellations are no longer possible. Once glass has been cut, tempered, laminated or assembled, modifying the order may require new material and additional production time. A short approval review can prevent a much longer delay later.
Frequently Asked Questions
Can tempered glass be cut after production?
Tempered glass cannot be safely cut, drilled, edged or notched after heat treatment. All fabrication must be completed before the panel enters the tempering process. If a required hole or notch is omitted, the normal solution is to manufacture a new panel with the correct preparation.
What should be included on a custom glass order?
The order should include quantities, finished dimensions, glass type, thickness, safety treatment, edgework, holes, notches, corner details, coatings, orientation and identifying marks. It should also state the application, drawing revision, delivery requirements and party responsible for final measurements.
Should contractors provide templates for shaped glass?
Templates are recommended for irregular shapes, curves and openings that cannot be described reliably with rectangular dimensions. The template should be stable, full-size and clearly marked with orientation and finished edges. The fabricator should confirm how the template will be interpreted before production begins.
Final Takeaway
Contractors ordering custom fabricated glass should confirm the application, source of dimensions, glass make-up, safety treatment, edgework, hardware preparation, coatings, tolerances and delivery sequence before releasing the order. The most expensive mistakes usually occur when dimensions are assumed or fabrication details are finalized after tempering. A complete written specification, coordinated drawings and a final approval review help ensure that each panel arrives ready for its intended opening.
