Rockwool fire rated cavity closers - SIG Insulation

1 Rockwool fire rated cavity closers Rockwool cavity closer systems have been developed to minimise thermal bridging atdoor and window reveals in cavity wall constructions. Rockwool Ltd can now offer asolution for both first-fix built-in (Rockclose) and second fix (RockReveal) systems are fire rated and exceed the minimum requirements of ThermalRobust ( )(M2)CI/SfBApril 2006 Rockclose Rockclose provides the user with a fire ratedcavity closer for masonry walls with areturning inside integral DPC built in as construction proceeds (First Fix)

2 One-hour fire integrity one width covers most applications easy to handle self supportingThe following NBS Plus clauses includeRockclose and RockReveal:F30: 18, F30:180 Application typeThermal, fireConstruction type cavity wallsZEROODPOZONEDEPLETINGPOTENTIALZEROG WPGLOBALWARMINGPOTENTIALRockReveal RockReveal is a fire rated cavity closer , whichcan be used in timber, metal and masonrycavity walls without the need to return no need to return block one-hour fire integrity easy to install second fix application no additional dpc requiredThermal bridging at junction openingsCold bridging has been a long recognized problem.

3 Whichhas been given even greater significance under the new PartL Building Regulation (2006edition). Cold bridging canresult in problems of condensation, staining and mouldgrowth at window and door reveals. In a typical building asmuch as 20% heat loss can occur around door and windowreveals if not correctly addressed. Prolonged exposure tosuch factors will lead to a deterioration of the internal plasterand paint work. Rockwool cavity closers systems have beendevelopment to minimise the occurrence of such have developed two cavity closer systemsRockclose and RockReveal that will exceed the minimumrequirement of for thermal resistance.

4 Whenfor example the window is set back at 30mm, the thermalresistance will in fact exceed (as indicated inthe Part L Robust Detail version 2001for walls ).Rockclose is to be used in masonry walls when the internalblock is being returned to close the void between theexternal skin and the returning block work. RockReveal is asecond fix application and has been developed to deal withclosing cavities without the traditional need of returningthe block work, it can also be used on timber, metal andPVCU is an insulated damp proof course.

5 It consists of astrip of glass-tissue-faced semi-rigid Rockwool insulationbonded to a black polyethylene dpc. The product is designedto be installed as work proceeds, between the facingbrickwork and closer blockwork prior to fitting of windowand door frames. It is self-supporting for ease of installation,yet resilient enough to allow for cut irregularities in Insulation white glass-tissue-facedLength: 1200mmWidths: 100,150and 190mm (to suit closer width)Thicknesses: 30, 50, 65, 75and 100mmOther thicknesses available to special orderDPC Black polyethylene to BS 6515 Length: 1300mmSide lap: 40mmBottom lap: 100mm (minimum)Standards and approvalsRockwool Rockclose complies with the requirements of BS EN 13162.

6 2001 Thermal Insulation products for buildings -Factory made mineral wool (M W ) products is protected by UK Patent No. 2289433 FireRockwool Rockclose has been assessed by WFRC (Report NoC114334) to give 60mins integrity and 30mins 1 Heat loss from a building which is the cause of coldbridging around window reveal without an insulated cavity junction with cavity insulationFigure 3 Plan view at jamb Rockclose with Timber frame set to cover vertical joint/dpcApplications and installationRockwool Rockclose is suitable for a wide range of dpcapplications including.

7 Closures at jamb positions at localised reductions in cavity widthsRockclose should be built in as brickwork proceeds andprior to fitting of the window or door frame. Installationmust follow good practice for the detailing of damp-proofcourses as set out in the relevant clauses of BS 5628: Part 3,BS 8215and BS 8000: Part 3. Supplied in 1200mm lengths ofinsulation, Rockclose may be easily cut on site as to the flexible nature of Rockclose, some localdelamination of the Rockwool Insulation may occur duringsite handling or installation.

8 This does not detract from theperformance of the product, either in its installation or inits long term durability. Full fitting recommendations forthe bricklayer are supplied with Rockclose insulated specification clauseThe insulated cavity closer to window and door jambs is tobe Rockwool Rockclose insulated cavity closer ..*mmwide and .. mm*thick, supplied by Rockwool Limited,Pencoed, Bridgend CF35 6NY, and installed in accordancewith the manufacturer s recommendations. Insert other applications as appropriate.

9 *Insert Insulation width to coincide with closer width, and thicknessas is an insulated non-combustible cavity consists of a strip of Rockwool encapsulated in weather-resistant polythene enclosed within a rigid PVCu product is designed to be installed to close cavitiesaround windows and doors in second-fix installationswithout the need to return the Insulation encapsulated in : : 50, 80, 90and 100mm (to suit close width)PVCu carrierLength: was tested at Warrington fire research and wasfound to be in accordance with BS476 Cert 20 provides a minimum of 60minutes fire integrityand up to60minutes fire 4 Plan view at jambRockclose with Aluminium frame in rebated check revealFigure 5 Plan view of steel frame construction with RockcloseProtection where stanchion protrudes into cavityRigid PVCu profileRockwoolPolythene encapsulationApplicationRockReveal is simple to install and is primarily used forsecond-fix applications.

10 It can be cut to the height or widthof the cavity opening, then push-fitted into the cavity , thuseliminating the need for cut blocks, bricks or special revealblocks. To fix in place use standard flat head galvanisednails, approximately one per block course. RockReveal isavailable in a range of sizes to fit cavity widths from 50to100mm, with sufficient design flexibility to tolerate roguecavity widths, thus reducing time and cost on site. Slightcavity width variations can be overcome by applying smallpressure.