Rules,for,Building,Spiral,Stai homerepair how to Rules for Building Spiral Staircase

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As they twist round in a tight curve they offer a very space-saving solutionwhen accessing a different floor, taking up considerably less floor space thana conventional staircase.In medieval times, spiralstaircases were commonly located in circular castle turrets and were oftenconstructed in stone. They were configured in a clockwise assent to giveattacking right handed swordsmen a disadvantage whilst ascending.These days spiral staircases designs havedeveloped dramatically and whilst maintaining their space saving benefits, aremanufactured in a variety of materials such as glass and stainless steel. Theynow offer the right property a stunning alternative to a standard staircase,becoming a stylish 'feature' of a room.Due to their tightconstruction they are not overly easy for the elderly or disabled to use andmoving large pieces of furniture between floors can prove tricky. For safetyreasons there are currently various rules and regulations governing the size ofspirals staircases installed in new builds and renovations in residential andcommercial settings.UK BuildingRegulationsSpiral staircases have theirown 'British Standard' dedicated to them - BS 5395 part 2. The BS is referredto in Building Regulations part K and ensures the spiral staircase is largeenough for the given application.Within the document, spiralsare divided into five categories, A-E with A being a secondary domestic spiraland E being a large fully public spiral. Each category dictates therelationship between the rise (height of each step) and going (depth of eachstep) and 'clear tread width' (the distance from the inside of the handrail tothe centre column) required for the spirals' usage. Generally, the more peoplethe spiral is providing access to, the larger diameter and the smaller the riseheight, making it safer and more comfortable to climb.Domestic Spiral StaircasesWith domestic spirals thereare two generally rules to adhere with - there should be no gap between thetreads or the balustrade of more than 100mm, and the balustrade should not beconstructed with climbable rails.Category A and B of BS 5395 dealwith the measurement requirements for domestic spiral staircases. Category A isreferred to as a secondary domestic spiral and category B covers spirals usedas main stairs within a dwelling.The clear tread width of asecondary spiral should be 600mm which (depending on the specific model /design) gives a 1450mm diameter when taking into consideration the centrecolumn and the balustrade to both sides. The height of each step should notexceed 220mm and the centre going should be at least 145mm. A spiral used as amain staircase should have a clear tread width of 800mm (1800mm diameter) and220mm maximum rise and a 190mm minimum central going. Generally the opening inthe floor for a spiral should be around 100mm larger than the diameter whetherthe opening is square / rectangular or circular. For example a 1600mm diameterspiral should have a 1700mm square or diameter opening. This is to allow for a50mm 'knuckle gap' between the handrail and edge of floor / wall on both sides.The top step of a spiral staircase is normally an enlarged step which connectsthe centre column to the edge of the floor. This top landing platform cansometimes be shaped to allow for slightly smaller openings.Commercial Spiral StaircasesCategories C-E of BS5395covers the required dimensions for commercial staircases - those to be used bythe public. The guidance ensures that people unfamiliar with the spiral can useit safely. With all commercial spiralsstaircases there is a requirement of a centre column handrail and a 'rest'platform if the flight consists of more than 16 risers.Category C is for a smallsemi-public stair and has to have a rise height of no more than 220mm and aclear tread width of 800mm. The diameter of this (with the centre columnhandrail in place) is therefore around 1900-2000mm. Category D is for a semipublic stair serving more than 50 people. The regulation looks for a minimumrises of 190mm and a clear tread with of 900mm (2100mm diameter).Category E deals with spiralsintended to be used by large number of people at one time - shopping centre orfootball stadium for instance. A 1000mm clear tread width is required alongwith a 190mm maximum rise and 250mm minimum going measurement.The guidelines covered byBS5395 are subject to interpretation by planning offices and are not always setin stone. A relaxant is sometimes offered when, for example, one is replacingan existing spiral.OVERVIEWSpiral Staircases offer theright property a stunning solution when accessing an upper level. There are avast number of different models currently on the UKmarket with many off-the-shelf kit solutions imported from Europe.Should you be looking to install / purchase a spiral, it is important to checkwith the supplier that is up to UKstandards. If in doubt, check with your building control officer. Article Tags: Clear Tread Width, Spiral Staircase, Spiral Staircases, Domestic Spiral, Rise Height, Each Step, Clear Tread, Tread Width, Centre Column, Spiral Should