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County Down · Northern Ireland

Curtain Walling in County Down

Curtain walling in County Down starts with a survey of the openings, structure and access, then a written quote that fixes the price for the system and glass shown.

  • Guide from £455 per m²
  • 11 towns covered
  • Postcode areas BT

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About curtain walling in County Down

Wind load on a facade rises with height, exposure and building shape, and it decides the mullion size, bracket design and glass thickness. Calculations for the specific site are part of the design, so a system suited to a sheltered ground-floor screen may not suit an exposed upper storey.

Toughened glass can very occasionally break on its own because of nickel sulphide inclusions. Heat soak testing to BS EN 14179 reduces that risk by breaking flawed panes in the factory, and it is often specified for toughened glass high on facades where a breakage is harder to deal with.

Curtain walling needs planned upkeep. Clean frames and glass regularly, keep drainage outlets clear, and inspect gaskets, seals and fixings for shrinkage, gaps or corrosion. Failed or misted sealed units can usually be replaced individually without removing the surrounding framing.

Where a glazed screen must resist fire, the glass only performs as part of a fire-resistant system tested with its frame, seals, beads and fixings. Ratings use letters such as E for integrity and EI for integrity and insulation, and components must not be swapped without test evidence.

Glass curtain wall on an office building against a blue sky

Towns we cover for curtain walling in County Down

Choose your town for local details, nearby areas and the postcode districts we cover.

What applies in County Down

Technical Booklet V covers safety glazing in Northern Ireland, including glass in and around doors and low-level glazing where people could walk into it.

Technical Booklet F1 sets the energy performance that replacement windows, doors and rooflights need to meet in Northern Ireland.

County Down has its own coastline, so for homes and businesses near the sea, salt air and wind-driven rain are part of the brief. Facades near the sea face salt-laden wind and driving rain, which attack frame finishes and stress seals. Suitable coating specifications, regular washing, gasket checks and higher design wind loads for exposed sites all matter for curtain walling there.

Commercial buildings on open rural or upland sites can face high wind exposure and driving rain, which affect frame sizes, glass thickness and sealing details. Longer delivery routes for large glass units also need planning in advance.

Guide prices

Guide prices inc VAT for typical jobs. Remote and island locations are quoted by arrangement. Your written quote fixes the price after measuring.
Typical jobGuide price inc VAT
Curtain walling, per m² (stick system)£455 – £795
Curtain walling, per m² (unitised)£545 – £955

Choosing your curtain walling

Capped system

Glass clamped by pressure plates behind a visible external cap, available in different profiles and colours to emphasise the grid.

Unitised curtain wall

Factory-assembled, pre-glazed storey-height panels lifted into place, reducing site joints and work at height on taller or tight sites.

Opaque spandrel panels

Insulated or back-painted glass panels that hide floor slabs, ceiling voids and services while keeping the facade's appearance consistent.

Stick curtain wall

Mullions and transoms assembled on site with glass and panels fitted afterwards, suited to low-rise buildings, entrances and ground-floor screens.

Curtain Walling in County Down: questions

Should I choose a stick or unitised curtain wall?

A stick system is assembled on site and generally suits low-rise buildings, entrances and smaller screens, with simpler logistics. A unitised system uses factory-made panels lifted into place, which reduces site joints and work at height but needs cranage and longer planning. The building's height, access and programme usually decide which is the right fit.

Can a single broken glass unit in a curtain wall be replaced?

Usually, yes. In capped systems the cap and pressure plate are removed to release the glass, and a new unit is fitted and resealed. Structurally bonded glass needs the new unit bonding to its carrier, which takes more preparation. Height and access drive much of the work, so we survey the unit and access before quoting.

What glass is used in curtain walling?

Curtain walling normally uses sealed double or triple glazed units, with toughened or laminated panes chosen for safety, security and wind load. Coatings control heat loss and solar gain, and heat-soaked toughened glass is often specified for upper levels. Where fire resistance is needed, a tested fire-resistant glazing system is used instead of standard glass.

How does curtain walling keep water out?

Curtain walling uses outer gaskets and seals to shed most rain, with drainage routes inside the framing that collect any water getting past them and lead it back outside. Inner seals then provide the air seal. Keeping drainage outlets clear and gaskets in good condition is essential, because blocked drains or shrunk seals can let water into the building.

Which parts of County Down do you cover for curtain walling?

We cover the whole of County Down, including Bangor (County Down), Castlereagh, Newtownards, Newry and Banbridge, and postcode areas BT. Building rules for curtain walling here follow the regulations for Northern Ireland. Enter your postcode on the quote form and we will confirm cover; then a glazier will arrange a free survey before giving you a written quote.

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