FLOOR CEILING PERPENDICULAR JOIST DOUBLE STUD TIMBER PARTY WALL - FRL 60/60/60 to 90/90/90

Oct 24, 2026

Upload by Rowan

Technical specification drawings for a floor/ceiling detail to a double stud timber party wall with perpendicular joisting, designed to achieve FRL 60/60/60 up to FRL 90/90/90. Specifies fire-tested system requirements and performance expectations including fire proof, flood proof, impact resistance, termite resistance, and mould & bacteria resistance. Provides section installation guidance for joist and truss support, insulation placement, board thicknesses, offsets, sealant gaps, and screw plate fixing schedules, with NATA/CSIRO testing references and limits on batten spacing.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages2

Reading Time5 min

AccessFree to download

Technical Specification Drawings

Side Elevation

Section Detail: Floor/Ceiling to Double Stud Timber Wall

TECHNICAL SPECIFICATION DRAWINGS SIDE ELEVATION FLOOR CEILING PERPENDICULAR JOIST DOUBLE STUD TIMBER PARTY WALL FRL 60/60/60 to 90/90/90 NATA Labs Australia Fire Tested Systems AS1530.4 and more FIRE PROOF FLOOD PROOF IMPACT RESISTANT TERMITE PROOF MOULD & BACTERIA PROOF DRAWINGS FLOOR CEILING PERPENDICULAR JOIST DOUBLE STUD TIMBER PARTY WALL [firecrunch.com.au](firecrunch.com.au) p 1300 933 102 [e technical@firecrunch.com.au](e technical@firecrunch.com.au) FIRE TESTED BY NATA/CSIRO & OTHERS FCA = FireCrunch Australia Page 1-Mar 26 v3 .1 TECHNICAL SPECIFICATION DRAWINGS SECTION DETAIL-FLOOR/CEILING TO DOUBLE STUD TIMBER WALL FRL 60/60/60 to 90/90/90 FRL 90/90/90 1x 10mm FireCrunch board each side of walls FRL 90/90/90 2x 10mm sheets to ceiling, offset thru joints 50mm Underside of joists on ceiling battens set at 300mm centres. If you are using ceiling battens under joisting, set at not less 300mm centres with 50mm offset joints where 2 boards are used for FRL 90/90/90 . Insulation R2 .5 90mm glasswool batts to both frames FRL 90/90/90 Use timber or 19mm blocking Floor truss perpendicular to wall. Truss supported by notching top chord into structural blocking (both sides slot) Slot 19mm flooring over notch cavity to meet timber blocker Slot for joist Slot for joist Screw fix plate P1 through P2 countersink 10mm into P1 100mm Bradford Gold Star R3 .5 50mm offset joints 90 deg metal angle 1.5 BMT for edge fixing ceiling linings both sides of top timber plate 19mm TG FireCrunch flooring Slot 19mm flooring over notch cavity to meet inner timber blocker Flexible fire-grade sealant at floor and ceiling min. 10 x 10mm gap AS1530 .4 PU type. See Recommended Products Screw fix plate P4 through P3 countersink 10mm into P4 Perpendicular joisting Tested joist 250-300mm x 45mm. Use MGP10 or LVL If joist depth is reduced to 190mm min. Increase fire batt to 150mm Additional sacrificial solid timber blocking (P1 and P4) for fire resistance each side (shaded), 45mm minimum thickness (same for P1) Drawing indicative only, not to scale Perpendicular Joist Installation FRL to 90/90/90-Check with your fire engineer or certifier NCC NOTE: Fire side floors must be able to collapse in the event of fire and leave the wall in tact. Where steel ceiling battens are used (not shown here), set on 300mm centres max. Stud wall must be covered with FireCrunch 10mm sheet MgSO4 = FRL 90/90/90 each side. Steel plate fixings and similar [see www.pryda.com.au](see www.pryda.com.au) DRAWINGS FLOOR CEILING PERPENDICULAR JOIST DOUBLE STUD TIMBER PARTY WALL [firecrunch.com.au](firecrunch.com.au) p 1300 933 102 [e technical@firecrunch.com.au](e technical@firecrunch.com.au) FIRE TESTED BY NATA/CSIRO & OTHERS FCA = FireCrunch Australia Page 2-Mar 26 v3 .1

FAQs

What FRL performance is targeted for this double stud timber party wall detail?

The drawings state FRL 60/60/60 up to FRL 90/90/90, including configurations for floor and ceiling components.

How should ceiling battens be spaced and how are board joints offset?

Underside joists on ceiling battens are set at 300mm centres; joints between boards are offset by 50mm for the FRL 90/90/90 arrangement when two boards are used.

What fixing and sealant requirements are specified for the floor and ceiling interfaces?

The specification calls for screw fix plate sequences (e.g., P1 through P2 and P4 through P3 with countersinking), plus a flexible fire-grade sealant at the floor and ceiling with a minimum 10x10mm gap to AS1530.4.

Oct 24, 2026

Upload by Rowan