06/12/201908/02/202116/03/2020Steel encasementsIntroductionFireCaseGypLyner encaseIntroduction!This section includes updated information, added since it was firstpublished in December 2015.SectionLast updatedC03CO3Steel encasements
This section contains steel encasement systems that provide upto 180 minutes of fire protection to structural steel columns and120 minutes for structural steel beams and joistsIntroductionC03Steel encasementsSteel encasementsC03. S01. P01british-gypsum.com
IntroductionSteel encasementsSteel encasementsC03Passive fire protection is a vital component ofany fire safety strategy. It safeguards people’slives and limits the financial impact of damageto buildings and their contents. The protectionof the superstructure from fire is especiallyimportant, as once its integrity is compromised,the whole building’s stability will be at risk.We have two types of solution:–FireCase – C03. S02. P02A frameless structural steel encasementwhere the board linings are fixed tothemselves to minimise space intrusion. Thesystem can be used in buildings before theyare fully watertight to improve speed ofproject handover–GypLyner encase – C03. S03. P02A metal framed structural steel encasementsystem for greater flexibility of installationEach system section takes you through theprocess of selecting the required lining typeand thickness to provide a range of standardstructural steel beam, column and joist sizeswith the fire protection level needed.Both systems are able to accept standardmethods of finishing; tape and joint or Thistleskim plaster, to aesthetically match surroundingelements. An aesthetic finish is not necessarywith the FireCase system to maintain its fireperformance.You may also be interested in.If you need to protect structual steel within the cavity,Refer to GypWall quiet C04. S07. P02 orGypWall quiet iwl C04. S08. P020115 945 [email protected] S01. P02
IntroductionC03Steel encasementsSteel encasementsAreas to consider when specifyingAll year round installationUnlike some alternative fire protection technologies, for exampleintumescent paint, our encasement systems will give acousticbenefits by reducing sound transmission through the steelwork.Further improvements can be made to the sound insulationperformance by the inclusion of Isover insulation within thesystem, and by modifying the abutment detailing to reduceflanking sound transmission.Glasroc F firecase and Gyproc plasterboards have an operationaltolerance from below freezing to 49 C, whereas some alternativetechnologies are often 5 C to 30 C. This ensures that there are nopotential problems with the build program in UK winter conditions.Refer to figure 1.Using FireCase or GypLyner encase could therefore offer both savingsand simplification over alternative fire protection technologies thatmay require overboarding.Thickness of applied fire protectionGlasroc F firecase and Gyproc plasterboards are manufactured tostringent factory tolerances, giving the client peace of mind thatthe correct thickness of fire protection has been applied, ensuringlife safety in the event of a fire.Building programme efficienciesThe FireCase and GypLyner encase systems allow other trades towork in close proximity and simultaneously. Some alternativetechnologies require areas of the site to be closed off due to thecontainment of overspray and fumes.Ease of maintenanceUsing the Regulatory Reform (fire safety) Order (RRO) theresponsible person has duty of care for maintaining the buildingsfire protection systems. The FireCase and GypLyner encase systemsare robust but should damage occur it is easy to identify and simpleto repair or replace, making management and maintenance simplefor building owners.Benefits to compartmentationUsing the FireCase or the GypLyner encase systems will eliminateany potential problems with compartmentation. Unlike somealternative fire protection technologies, e.g. paint, using theFireCase or GypLyner encase systems will ensure that there are nopotential problems with insulation failure through the steelwork.Refer to figure 2.C03. S01. P03Additional informationTry out The White Book System Selector,an online tool designed to help find theideal solutions for your project needs.Visit british-gypsum.combritish-gypsum.com
IntroductionSteel encasements (continued)1Steel enefit to acoustics2180 C fireinsulationmaintainedFireBenefits of compartmentation0115 945 [email protected] S01. P04
FireCaseSteel encasementsC03FireCaseFrameless structural steel encasement system that providesup to 120 minutes fire protectionAll our systems are covered by SpecSure when usinggenuine British Gypsum and Saint-Gobain Isover products
FireCaseFireCase120minsRefer to C01. S01. P07System can be skimfinished withThistlePro PureFinish.Refer to C02. S01. P49Key benefits— Frameless system that minimises the spaceneeded to provide fire protection to structuralsteel— Reduced installation time as Glasroc F firecaseboards can be screw-fixed to one anotherwithout the need for other components— Build-programme flexibility and earlierinstallation as the inherent moistureresistance capability of Glasroc F firecasemeans that installation of the FireCase systemcan commence before the building envelope isfully weather tight— FireCase system is easy to inspect forcontinuity when compared to intumescentpaint solutions, giving greater peace of mindboth immediately after installation and duringmaintenance inspections— Reduced waste and labour onsite as bespoke,pre-cut widths of Glasroc F firecase areavailable (subject to minimum order quantity)— High levels of acoustic insulation, inaddition to excellent fire protectionperformance, can be maintained withappropriate detailing to the abutmentsbetween GypWall partition systems andFireCase steel encasements— British Board of Agrément (BBA) approved(93/2935)0115 945 [email protected] S02. P02C03The Glasroc F firecase lining provides a smooth,robust surface with no requirement to jointor apply a decorative treatment.30Steel encasementsFireCase is a frameless structural steelencasement system that provides up to120 minutes fire protection to a wide rangeof universal beam, column and joist sizes.Installation is quick and easy owing to the abilityto fix Glasroc F firecase boards to one anotherwithout the need for additional framing.
FireCaseFireCase designC03Steel encasementsPlanning – key factorsFireCase steel encasement is suitable for protecting structural steelsections with a section factor A/V (Hp/A) up to 260m-1, calculatedon the basis of box protection to three or four sides as required. Itwill protect universal column and beam sections described inBS 4: Part 1, and many joist sections.Where these criteria are not met, the partition framing must besuitably fixed to the structural steel section, through theGlasroc F firecase cladding. Where the partition abuts the web of thestructural steel, a suitable steel nogging must be provided.Refer to construction detail 10.Partition to structural steelwork junctionsLining selectionFollow the procedure below to determine the thickness of claddingrequired:When designing the layout of rooms requiring separation by soundinsulating walls abutting structural steelwork, consideration shouldbe given to the potential loss of sound insulation performancethrough the steelwork.Option 1Use tables 2 - 4 to select steel size and fire protection then read offthe required board size.Figures 13 to 16 are example details relating to a typical scenariowhere a partition is specified against a requirement of Rw 50dB.Option 21 Ascertain whether protection is required on three or foursides of the sectionAlthough these details refer to structural steel column abutments,similar principles apply when abutting structural steel beams.We recommend that these details are checked by an AcousticConsultant, in particular the performance via the flanking structure.2Find out what period of fire protection is required3Refer to the A/V (Hp/A) tables 5 - 7. Locate the steelsection to be protected, listed by its size and massper metre, and read off the section factor A/V45Refer to tables 8 - 11. Locate the A/V value on the verticalscale on the appropriate table. Read across the chart tothe column relating to the period of fire protectionrequired and read off the designated thickness of therelevant cladding required to form the encasementSelect the type of board to be using the key below each tableThe information in this section is only relevant to solid steelsections. For castellated sections and cellular beams please refer tothe Association for Specialist Fire Protection publication,ASFP Yellow Book - ‘Fire Protection for Structural Steel in buildings’for guidance, available to download from asfp.org.ukFinishingGlasroc F firecase joints can be treated using Gyproc Joint Tapebedded in Gyproc QuickSand Joint Cement. External angles /corners can be reinforced using Gyproc Drywall Metal Angle Beadbedded in Gyproc QuickSand Joint Cement.Refer to C08. S03. P02 – Finishes, Jointing.If a plaster finish is required, joints should be reinforced andThistle BoardFinish, ThistlePro DuraFinish or Thistle MultiFinishapplied.Refer to C08. S02. P02 – Finishes, Plaster skimming andC07. S02. P02 – Linings, Plaster systems.Jointing and finishing is not a requirement of meeting the specifiedfire resistance. Board joints / abutments must be a flush fit.Partition fixing BS 476 - Part 22 onlyPartitions and wall linings may be fixed directly to theGlasroc F firecase cladding as long as:Important information1The fire resistance requirement of the partition is60 minutes or less2There are no special requirements for pressureresistance, e.g. around lift shafts– Where steel section web dimensionsexceed 600mm, additional supportwill be required for the cladding.Please contact the British GypsumTechnical Support Team for guidance.3There are no special loading requirements, i.e. Heavy Dutyor Severe Duty as defined in recognised partition performancespecifications (e.g. BS 5234)– All joints should be staggered byminimum of 600mm between adjacentboards and between board layers.Refer to construction detail 9.C03. S02. P03british-gypsum.com
FireCaseFireCase design (continued)Table 1 – Specialist board fixingsBoardBoard-to-board fixingBoard-to-metal fixing1540mm Glasroc F firecase Screws40mm Glasroc F firecase Screws2050mm Glasroc F firecase Screws40mm Glasroc F firecase Screws2558mm Glasroc F firecase Screws40mm Glasroc F firecase Screws3070mm Glasroc F firecase Screws40mm Glasroc F firecase Screws15 2040mm and 50mm Glasroc F firecase Screws40mm and 50mm Glasroc F firecase ScrewsImportant informationWhere partitions abut a FireCase column or beam encasementand it is important to minimise the downgrade in acousticperformance, use either:–Isover insulation within the web spaceRefer to construction details 14 and 15; or–Additional framing, Isover insulation and Gyprocplasterboard liningRefer to construction detail 160115 945 [email protected] S02. P04C03(mm)Steel encasementsMinimum fixing lengththickness
For details of whento specify fireresistance using BSRefer to C02. S01. P05Table 2 550 C chart to BS 476: Part 20 (following ASFP Yellow Book3rd Edition appraisal methodology) for selecting the requiredGlasroc F firecase lining thickness for universal beam sizesSteel encasementsFireCaseFireCase design (continued)Total Glasroc F firecase board thickness (mm) to achieve fire resistance below1Universal beam serial size of steel(mm x mm x kg/m)3 sided encasement4 sided encasementBMass/metre30 min60 min90 min120 min30 min60 min90 2020202020C03D914838762686610533Glasroc F firecase thickness combinations:115mm 1 x 15mm20mm 1 x 20mm25mm 1 x 25mm30mm 2 x 15mm35mm 1 x 15mm 1 x 20mm120 eam/column/joist dimension orientation:DSystem references: D120001 (screwed system)BC03. S02. P05british-gypsum.com
FireCaseFireCase design (continued)For details of whento specify fireresistance using BSRefer to C02. S01. P05Total Glasroc F firecase board thickness (mm) to achieve fire resistance below1Universal beam serial size of steel(mm x mm x kg/m)3 sided encasement4 sided encasementBMass/metre30 min60 min90 min120 min30 min60 min90 5252525202525252525406356305254203178152127Glasroc F firecase thickness combinations:115mm 1 x 15mm20mm 1 x 20mm25mm 1 x 25mm30mm 2 x 15mm35mm 1 x 15mm 1 x 20mm120 eam/column/joist dimension orientation:DSystem references: D120001 (screwed system)B0115 945 [email protected] S02. P06C03DSteel encasementsTable 2 (continued) 550 C chart to BS 476: Part 20 (following ASFPYellow Book 3rd Edition appraisal methodology) for selecting therequired Glasroc F firecase lining thickness for universal beam sizes
For details of whento specify fireresistance using BSRefer to C02. S01. P05Table 3 550 C chart to BS 476: Part 20 (following ASFP Yellow Book3rd Edition appraisal methodology) for selecting the requiredGlasroc F firecase lining thickness for universal column sizesSteel encasementsFireCaseFireCase design (continued)Total Glasroc F firecase board thickness (mm) to achieve fire resistance below1Universal column serial size of steel(mm x mm x kg/m)3 sided encasement4 sided encasementBMass/metre30 min60 min90 min120 min30 min60 min90 0201520202025C03D305254203152Glasroc F firecase thickness combinations:115mm 1 x 15mm20mm 1 x 20mm25mm 1 x 25mm30mm 1 x 30mm 235mm 1 x 15mm 1 x 20mm120 5152020253030302530303030Beam/column/joist dimension orientation:DSystem references: D120001 (screwed system)BFor steel used in a vertical orientation i.e. columns, either 1 x 30mm or 2 x 15mm may be used. For steel used in a horizontal orientation i.e. beams, 2 x 15mmshould be used.2C03. S02. P07british-gypsum.com
FireCaseFireCase design (continued)For details of whento specify fireresistance using BSRefer to C02. S01. P05Total Glasroc F firecase board thickness (mm) to achieve fire resistance below1Universal joist serial size of steel(mm x mm x kg/m)3 sided encasement4 sided encasementBMass/metre30 min60 min90 min120 min30 min60 min90 1520202025305254203152Glasroc F firecase thickness combinations:115mm 1 x 15mm20mm 1 x 20mm25mm 1 x 25mm30mm 2 x 15mm35mm 1 x 15mm 1 x 20mm120 5152020253030302530303030Beam/column/joist dimension orientation:DSystem references: D120001 (screwed system)B0115 945 [email protected] S02. P08C03D356Steel encasementsTable 4 550 C chart to BS 476: Part 20 (following ASFP Yellow Book3rd Edition appraisal methodology) for selecting the requiredGlasroc F firecase lining thickness for universal joist sizes
FireCaseFireCase design (continued)C03Steel encasementsTable 5 Section factor A/V (Hp/A) of universal beamsTable 5 (continued) Section factor A/V (Hp/A) of universal beamsA / V ValuesUniversal beamsserial size of steel(mm x mm x kg/m)3 sidedencasement4 sidedencasementA / V ValuesUniversal beamsserial size of steel(mm x mm x kg/m)3 sidedencasement4 33406356305254203178152127Beam/column/joist dimension orientation:DBYou may also be interested in.Need 180mins fire protection? If so, consider theGypLyner encase system.Refer
Benefit to acoustics Sound Partition performance maintained Fire 180 C fire insulation maintained . FireCase Frameless structural steel encasement system that provides Steel encasements up to 120 minutes fire protection C03 FireCase All our systems are covered by SpecSure when using genuine British Gypsum and Saint-Gobain Isover products. FireCase FireCase is a frameless structural steel .