E 30 – EI 120
Fire-Resistant Glass
Integrity and insulating fire glass supplied and fitted into tested frames.
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Berkshire · SL4
Insulated Fire Glass (EI) — Windsor and SL4
We provide insulated fire glass in Windsor and across Berkshire, working from the classification your building needs and handing over the evidence that proves what was fitted.
EI 30 – EI 120SL4England
Quote for Windsor
Tell us what you need. We reply with next steps and a guide price.
Insulated Fire Glass (EI) in Windsor: what's included
EI glass is the choice where people need to pass close to the glass during a fire, where combustible materials sit near it, or where building guidance would otherwise restrict glazing. We supply and fit EI 30 to EI 120 glass in tested frames, internally and externally.
- Insulating glass in sealed double-glazed units
- Impact-classified insulating glass
- Internal and external-grade build-ups
- Handling and installation of heavy panes
Key checks for Windsor projects
Optical quality
Modern EI glass is clear in normal use, with high light transmission at lower ratings.
How it works
When heated, the interlayers turn opaque and expand, forming an insulating shield. After a fire the glass will need replacing.
The temperature rule
EI testing limits the average temperature rise on the unexposed face to 140°C and any single point to 180°C, which is why people can pass it.
Fire glazing rules in England
England Which rules apply?
Building work in England is covered by the Building Regulations 2010, with fire safety guidance in Approved Document B and impact safety guidance for glazing in Approved Document K.
Once a building is in use, the Regulatory Reform (Fire Safety) Order 2005 requires the responsible person to maintain fire safety measures, including fire-resisting glazing. The Fire Safety (England) Regulations 2022 add duties for multi-occupied residential buildings, including fire door checks in buildings over 11 metres.
In higher-risk buildings, broadly 18 metres or seven storeys with two or more homes, the Building Safety Regulator is the building control authority. England is also phasing out BS 476 references from Approved Document B, with the remaining fire-resistance references due to go in September 2029.
Windsor coverage and nearby towns
Our Berkshire coverage takes in Windsor (SL4, SL3, SL1) and the neighbouring towns of Slough, Egham, Staines-upon-Thames. Windsor is about 26 km from Reading, the largest town in our Berkshire coverage.
EI glass in SloughEI glass in EghamEI glass in Staines-upon-ThamesEI glass in MaidenheadEI glass in Uxbridge
How we work in Windsor
Fixed written quotes
After survey you get a fixed written quote for the agreed scope, so Windsor budgets are not open-ended.
Honest about unknowns
If an existing frame in a Windsor building has no traceable evidence, we say so and price the options rather than guess.
Work around occupied buildings
We can phase work in Windsor around residents, staff or pupils, with out-of-hours options.
Windsor building types
We can survey and quote for industrial units, retail and leisure units and other building types in Windsor.
FAQs for Windsor
What does EI 60 mean?
The glazing system kept fire on one side (integrity) and limited the temperature rise on the other side (insulation) for at least 60 minutes in a standard fire test.
Why is insulated fire glass so much more expensive?
It is a multi-layer product with specialist interlayers, and the frame and installation must suit its weight.
How quickly can you survey in Windsor?
Survey timing in Windsor depends on access, the size of the building and how urgent the defect is. Tell us your deadline when you enquire and we will confirm a date before you commit.
Which rules apply to fire-rated glazing in Windsor?
Building work in Windsor follows the Building Regulations 2010 and Approved Document B, and occupied buildings are covered by the Regulatory Reform (Fire Safety) Order 2005.
Related
Related services in Windsor
E · EW
Integrity Fire Glass (E & EW)
E and EW glass where flames and hot gases must be stopped.
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E 30 – EI 60
Stair, Lobby & Corridor Glazing
Glazed screens and doors on protected stairs, lobbies and corridors.
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E 30 – EI 60
Frameless Fire-Rated Glazing
Butt-jointed fire glass walls with minimal frames.
Learn more →Process
How a Windsor job runs
Start with the brief
Tell us the rating required, sizes and building type, or ask us to find out.
Measure and check
We measure each opening in Windsor and check what the existing frames can accept.
Quote and evidence
Your quote lists each item with its classification and the evidence it relies on.
Fit and record
We install, photograph seals and fixings before closing up, and hand over the schedule.