Heritage glass units are available in a range of configurations. A different glass type represents each era of building. At The Original glass Company, we understand that all historical buildings have an individual character which is often completely unique. With this in mind, we can manufacture bespoke glass units to meet your exact requirements. Three of our most regularly used Heritage units are:
Heritage 3/4/3 machine drawn glass is used for the external pane. The internal pane features energy saving coated glass for unrivalled thermal performance. The units’ overall thickness is 10mm and the centre pane has a U-value of 1.9W/m²k. 3/4/3 refers to 3mm clear drawn glass, 4mm Krypton gas filled cavity, 3mm coated.
Heritage 4/4/4 unit using clear float glass for the external pane. The internal pane features energy saving coated glass for unrivalled thermal performance. The units’ overall thickness is 12mm and the centre pane has a U-value of 1.8W/m²k. 4/4/4 refers to 4mm clear float glass, 4mm Krypton gas filled cavity, 4mm coated.
Heritage 4/6/4 unit using clear float glass for the external pane. The internal pane features energy saving coated glass for unrivalled thermal performance. The units’ overall thickness is 14mm and the centre pane has a U-value of 1.4W/m²k. 4/6/4 refers to 4mm clear float glass, 6mm Krypton gas filled cavity, 4mm coated.
Heritage 4/8/4 Building Regulations Document L compliant glazing. The internal pane features energy saving coated glass for unrivalled thermal performance. The units’ overall thickness is 16mm and the centre pane has a U-value of 1.1W/m²k. 4/8/4 refers to 4mm clear float glass, 8mm Krypton gas filled cavity, 4mm coated.
Thin sealed glass units supplied by The Original Glass company conform to BS EN 1279: Parts 1-6 certification, providing that installations are completed in line with our specific fitting instructions. Covering all you need to know in order to best exceed even the strictest thermal and/or conservation requirements, once followed you’ll be able to offer homeowners the slimmest and most energy efficient heritage double glazing possible.
Hodgson Sealants Heritage Glazing Putty
Glazing Setting Blocks
Sheradised Pins/Non-Rusting Metal Sprigs
Hand Held Moisture Meter
High Powered Skeleton Gun
These Glazing Systems are recommended for use where a sole glazing material is required to provide a back bedding material, perimeter fill and putty front, or for bead glazing, without the need for multiple products. These Glazing Systems are suitable for the restoration of period properties, listed buildings and glazing in conservation areas in all frame types. Heritage Putty is elastic when cured giving a higher movement accommodation than traditional putties, this is beneficial when used in applications with a reduced sightline and / or narrow rebates in order to accommodate movement. Heritage Putty can also be painted within a short time frame relative to traditional putty types. Linseed oil putty must never be used as it damages the seals of the glazing units.
This diagram illustrates internal fronting only
This diagram external beads only
Note: Heritage Putty may also be required to comply with BS8000: Part 7 Clause 2.2.1(e) sealing of frame section junctions and fabrication holes, prior to glazing.
Hodgson Heritage Putty is paintable with water and solvent based products. It is recommended that due to the availability of many different paint types that compatibility tests are conducted prior to painting. Heritage putty can extend the drying time of solvent based paints therefore the use of a water based undercoat can be considered in order to avoid this. Skin formation and curing times of Heritage Putty will vary depending upon temperature and humidity, lower temperatures and low humidity will extend rates of cure. Heritage Putty can be painted once a suitable skin has formed, however, for best results it is recommended that paint is applied a few days after glazing. The paint should overlap the putty onto the glass by 2mm and be kept in good repair.
Many instances of premature unit failure can be traced directly back to incorrect size selection or absence of distance pieces. Ideally they must have a minimum thickness of 3mm*.
*This may be reduced to 1.5mm when glazing into frames with reduced rebate upstands / sightlines.
In order to allow the unit to be fully bedded in glazing material, each frame opening must be measured, the unit size calculated and the minimum required edge clearance (3mm*) taken into account as described below.
At the time this document was written a Narrow Cavity Insulating Glass Unit or Reduced Sightline Unit as defined by the GGF is an IGU with cavity widths of 8mm or less and with reduced spacer- bar sightlines. Typically these reduced sightline IGUs are required to have spacer-bar sightlines that are less than the usual minimum sightline depth (determined by the depth of the spacer-bar and the minimum sealant depth stated by the sealant manufacturer).
Due to dimensional constraints, especially when re-glazing existing frames previously designed to receive single glass; it should be noted that when glazing narrow cavity or reduced sightline IGUs, it may not be possible to meet all of the requirements of BS6262, BS8000 or GGF data sheet 4.2. In all instances it is recommended that the glazing method employed should be based on the IGU manufacturer’s own recommendations. Consideration will also need to be made when calculating the required size of the reduced sightline IGU.
Fixed Light or Direct Glazed
Before the installation, inspect the double glazed unit for obvious defects and wipe any dust or loose material off the unit. Units should be stored in a clean dry area. Do not use chemicals on the edge seal or alcohol based cleaner.
These steps apply for both the Beaded & Putty glazing methods.
First follow the steps outlined in the glazing of frames section (under no circumstances use linseed oil putty as it will damage the seals of the glazing unit).
When painting Hodgson Heritage Putty, information contained within coating system suitability in the pre-installation section of this document should be observed. Regular maintenance of the frame is essential to ensure maximum performance of the glazing system and IG unit.
First follow the steps outlined in the glazing of frames section.
Linear metres of glazing per 290ml cartridge for putty fronting in accordance with glazing system. For a typical sash containing 9 off 300 x 200mm units approximately 2 cartridges would be required. This calculation does not allow for any wastage in the process.
If you’d like to experience our premier product up close, we readily offer those of interest a super-thin double glazed unit sample. Wherever in the UK you are based, simply input your details online and our team will get one sent out to you promptly.Request Sample
Our glass meets the strictest of standards
This allows us to:
Giving project architects the smoothest time possible from the time of planning to final installation, we develop Heritage units that help you overcome even the most difficult expectations.More About Glass Units for Architects
We actively fabricate and supply our entire range of thin sealed units countrywide to the trade, letting all reputable trade installers cater for conservation builds.More About Glass Units for Trade