Commercial Framing Systems - Ullrich Aluminium

DESIGNALUMINIUMSection No:Page No:Date:Replaces:2301.05.052003 EDITIONSTEP 2: Building needs to be Defined.A house can be a Class 1 or Class 10 subject to its geometric size. AS4055 defines abuilding as follows:TABLE: 2. BUILDING DEFINITIONSReferenceFrom ground to the underside of eavesFrom gound to the highest point of roof excluding chimneyExternal wall height measured between storeysBuilding width including roofed verandahs, but excluding eavesBuilding lengthRoof pitchMaximum dimension6 m8.5 m2.7 m16 mNot to exceed 5 x widthNo greater than 35˚STEP: 3. Determine window rating.The rating is the wind pressure that the window can withstand.AS1170.2 defines window rating for residential buildings as “LIMITEDSTATE DESIGN WIND PRESSURE”AS2047.2 and AS4055 defines window rating for housing as “WINDCLASSIFICATION TERMS”The Building Window Rating is subject to ‘Individual aspects’ which canchange according to the ‘building application’ see table 3 below.TABLE: 3. WINDOW RATINGApplication Deflection Water penetrationAir infiltration L/s m 2 at testpressure - all applicationsHousing Span/150 150pa - 450pa Non Air Cond. 5.0 @ 75Padepending on8.0 @ 150Pageographic region.Residential Span/180 Air Cond 1.0 @ 75Pa1.6 @ 150Pa30% of ServiceabilityCommercial Span/250 Louvres 20 @ 75Pa32 @ 150Pa