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Product images: the manufacturer (official).
SFRM · concealed steel
Low-density cementitious spray
A light cementitious spray for steel hidden above ceilings and inside walls – fast to apply over large areas, ratings up to about four hours.
- Low
- Density class
- up to ≈ 4 h
- Typical rating
- Interior, concealed
- Exposure
Supplied by World Steel with your steel building or on its own – one order, one shipment, one partner.
Overview
About Low-density cementitious spray
Sprayed directly onto clean, primed or bare steel as specified, in one or more passes.
Thickness set by the member, rating and listed design – measured to ASTM E605.
Covered by ceilings or linings – not for exposed, wet or high-traffic areas.
Key benefits
- Lowest cost per m² for long ratings
- Fast application over large areas
- Covers complex shapes and connections
- Also protects metal decks
World Steel · building envelope hub
How we use Low-density cementitious spray in steel buildings
World Steel coordinates sprayed fire protection with the steel: compatible primers, clean surfaces and member-by-member thickness schedules from the fire design.
- 01Specified with the structure – thickness, density and facing matched to the roof, wall and fire design.
- 02Quantities taken from the same 3D model as the steel, purlins and cladding.
- 03Packed and shipped with the steel package – one delivery schedule to site.
Applications
Where Low-density cementitious spray is used
- Concealed beams and columns in offices and hotels
- Steel and metal decks above ceilings
- High-rise steel frames
Technical data
Low-density cementitious spray – technical properties
Typical properties
| Property | Unit | Value |
|---|---|---|
| Density | kg/m³ | low – typically ≈ 240 – 350 |
| Typical rating range | h | 1 – 4 |
| Test standards | — | ASTM E605 (thickness, density) · ASTM E736 (cohesion / adhesion) · UL 263 · EN 13381-4 |
Values as published by the manufacturer for this market. Always check the current data sheet and the approvals required for your project before ordering.
Sprayed fire-resistive materials
Related products
SFRM · gypsum-basedGypsum-based sprayed fireproofingView product →SFRM · exposed and industrialMedium- and high-density cementitious sprayView product →SFRM · medium densityMedium-density cementitious sprayView product →SFRM · lightweightVermiculite / perlite sprayView product →← Cementitious and mineral spraysSprayed Fire-Resistive Materials (SFRM) →
FAQ
Frequently asked questions
What thickness of low-density cementitious spray do I need?
It depends on the member size (section factor), the critical temperature and the required fire rating – the fire engineer or the manufacturer's tested data gives a thickness for each member.
Does World Steel supply branded products?
Yes – we supply the brand and listed system your specification or authority requires. This page describes the product type.
One partner for structure and envelope
Send us your drawings or bill of quantities – we quote the steel, insulation, boards and ceilings together and ship them as one package.