E 30 – EI 120
Fire-Resistant Glass
Integrity and insulating fire glass supplied and fitted into tested frames.
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County Durham · DH3
Insulated Fire Glass (EI) across Chester-le-Street
When a fire strategy, inspection report or building control comment in Chester-le-Street calls for glazing tested to resist fire, our insulated fire glass service covers survey, supply and installation.
EI 30 – EI 120DH3England
Quote for Chester-le-Street
Tell us what you need. We reply with next steps and a guide price.
What our insulated fire glass service includes in Chester-le-Street
Insulated fire glass, classified EI, is glazing that maintains integrity and keeps the temperature rise on the non-fire side within set limits for the rated time. It is usually made of several glass panes bonded with interlayers that foam into an insulating barrier when heated, or with a clear gel that absorbs heat.
- Internal and external-grade build-ups
- EI 30, EI 60, EI 90 and EI 120 glass
- Insulating glass in sealed double-glazed units
- Matched glazing systems and seals
Before you order insulated fire glass: what matters
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.
Thickness and weight
Each step up in rating adds layers, so EI 120 is far thicker and heavier than EI 30. The frame has to be designed for it.
Optical quality
Modern EI glass is clear in normal use, with high light transmission at lower ratings.
Where we work around Chester-le-Street
Whether the building is in central Chester-le-Street or the wider DH3, DH2 districts, we can survey and quote. We also cover Washington, Houghton-le-Spring, Stanley. Chester-le-Street is about 37 km from Darlington, the largest town in our County Durham coverage.
EI glass in WashingtonEI glass in Houghton-le-SpringEI glass in StanleyEI glass in DurhamEI glass in Felling
What every Chester-le-Street quote includes
Fixed written quotes
After survey you get a fixed written quote for the agreed scope, so Chester-le-Street budgets are not open-ended.
England rules applied
Designs follow the building and fire safety rules that apply in England, not a one-size-fits-all approach.
Work around occupied buildings
We can phase work in Chester-le-Street around residents, staff or pupils, with out-of-hours options.
Which rules apply to insulated fire glass in Chester-le-Street?
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.
Sectors we cover in Chester-le-Street
Sector guides below cover retail and leisure units, public buildings and other buildings in Chester-le-Street.
Insulated Fire Glass (EI): Chester-le-Street questions
Does EI glass need replacing after a fire?
Yes. Once the interlayers have reacted, the glass has done its job and must be replaced.
Can EI glass be used outside?
Only products approved for external use, usually in a sealed unit with UV protection.
Which rules apply to fire-rated glazing in Chester-le-Street?
Building work in Chester-le-Street follows the Building Regulations 2010 and Approved Document B, and occupied buildings are covered by the Regulatory Reform (Fire Safety) Order 2005.
Do you work on occupied buildings in Chester-le-Street?
Yes. We plan phasing, out-of-hours work and temporary protection so the building can stay in use where the fire strategy allows.
Related
Related services in Chester-le-Street
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
What happens next
Start with the brief
Tell us the rating required, sizes and building type, or ask us to find out.
Survey
We visit Chester-le-Street to measure, record existing marks and check the frames and substrate.
Written proposal
We set out the system, glass, evidence and programme, with a fixed price.
Complete and document
Work is completed to the manufacturer's details and documented for your records.