2011 Structural & Corrosion Cpd Pdf Version

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Problems with specifications account for 25% of PI claims.

Problems with specifications can lead to dispute, especially 'or equal' specifications.

The quality of specifications has declined over the past 20 years. Source RIBA providers network

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Specifying Roofing, Cladding and Rain-screen systemsHow important are the fasteners ?What are the Design Considerations ?

Presenter Gavin Luke to

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Agenda

SFS intec - a profile Prevention of Corrosion in systems Prevention of Corrosion in Fasteners Stainless Steel vs Carbon Steel Product selection - Structural and Durability Case Histories Solutions & new Technologies Meaningful Warranties The Route to Specification

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Global Manufacturing & Marketing - Powerful Technologies

GB-Leeds

US-Medina IT-Fontanafredda FR-Valence

CH-Heerbrugg

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SFS intec Construction DivisionManufacturers of Specialist fasteners and sealants forRoofing / Cladding / Rain-screen / Timber / Flat Roofs Glass

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CorrosionA fact of life with carbon steel

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Modern Construction Methods

The Enemy….. Corrosion of Carbon Steel

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BS7453: 1992 Guide to durability of buildings.

Civic and other high quality buildings

Minimum 120 YearsLong Life

New health and education buildings.New housing.High quality refurbishment of public buildings.

Minimum 60 YearsNormal Life

Most industrial buildings.Housing refurbishment.

Minimum 30 YearsMedium Life

Temporary class rooms.Office internal refurbishments.

Minimum 10 YearsShort Life

Non permanent site huts. Temporary exhibition buildings.

Agreed PeriodUp to 10 Years

Temporary

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BS5427 1996 Code of practice for the use of profiled sheet for roof and wall cladding.Carbon steel fasteners should not be used in:Marine environment 2km from coast.Coastal environment 10km from coast.Any environment subject toairborne pollution/Industrialised.Fasteners are not replaceable.Fasteners are not repairable.

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Preventing Corrosion in metals

Coatings - painting; enamelling; powder coating; plastic coating

Galvanization - a zinc coating created by hot dipping or electroplating (Zinc carbonate layer is eventually produced, which corrodes much more slowly ?)

Resistant metals - Aluminium; Zinc; Lead; Copper

Alloys - Carbon; Chromium; Nickel= Stainless Steels BY PASSIVATION

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Design Considerations - Corrosion of Fasteners

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Galvanic attack

Bad design

The cathode drives the corrosion against the smaller anode

Cathode ( sheet ) is not affected

Anode ( fastener ) is sacrificed

Fastener immediately at risk !!

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Choice of material important

The Galvanic Table

Anodic - more active

Magnesium Zinc AluminiumCadmiumCarbon / Mild Steel SteelWrought IronStainless Steel (Ferritic)Tin Lead BrassCopperBronzeCopper NickelStainless Steel (Austenitic)TitaniumSilverGold

Cathodic - less active "noble"

Direction of Activity

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Design ConsiderationsAn Example - Ventilated Facades & Rainscreens

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Design Considerations - Facades and Rainscreen Cladding The Reality

• External Panel (Specified by Architect)• Support Frame (Chosen by Contractor)• Insulation (Chosen by Contractor)• VCL (Chosen by Contractor)• Fasteners ??? (Chosen by Contractor)

The IssueMix and Match - a recipe for disaster

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Bracket to Structure

Stainless Steel to Masonry

Stainless Steel fasteners - into Steelstructure

Stainless steel fastener - into timberrails

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Rail to Bracket -Panel to Rail

Stainless steel to Aluminium

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Specify 'Stainless Steel'Not the solution

Ferritic - 12% chromium

Martensitic - (400 series)11% chromium plus nickel

Austenitic 304 / 316 * (300 series)17% chromium / 10% nickel / molybdenum* recommended by BS 5427

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Swimming PoolsDesign Considerations - Chlorine saturated environment

Super Austenitic Stainless Steel !!Grade 1.4574 Alloy

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Design Considerations - Structural

Drill Point / Efficient Fastening

Pull out values / Fastener Frequency

Workmanship & Waste

Durability and Warranty

Cost ????

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A Fastening System - not a screw !!

Under-head recess

3mm, 40 shore epdm washer

'Sharks Tooth' stainless steel thread

Longer, stronger drill point welded to thread

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Improved pull out values means fewer fasteners into lighterconstruction (1.2mm steel reduced from 1.6mm)

Improved pull out values combined with accurate wind load testing

20m X 50m X 8m METAL CLAD BUILDING10,000 fastener required from a competitor = 5555 no at .011p =

Using lightweight construction reduces the number of fasteners to = 1m² hole in structure

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New technologies - improving performance

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CLAMPING fastener - not just a 'stitcher' !

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The SFS IntecMobile Training and Demo Van

Educating the Contractor

On Site Technical Support

Lakesmere

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Design Considerations

Case Histories

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The Olympic Aquatic Centre - Design Consideration Chlorine resistanceOverall 25 yr Warranty

Austenitic Stainless Steel Grade 304 Super Austenitic Stainless Steel below VCL

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Greenock Waterside - Design Considerations -Corrosion of fasteners in Marine Environment 25 yr warranty

Austenitic Stainless Steel fasteners

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Bagland Paper Mills - Design ConsiderationsCoastal Location - corrosion of envelope fastenersHigh Humidity interior - internal corrosion of fastenersCold bridging on flat roofOverall 25 yr warranty

Austenitic Stainless steel fasteners both externally and internallyThermally broken austenitic stainless steel fasteners on flat roof

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BAE - Samlesbury

'Snap off' fastener on roof / security fastener on walls

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Cardiff Millennium Centre - Design Considerations Low Profile / colour-matched cladding fastenerGalvanic reaction to copper cladding 25 yr warranty

Snap off fastener on standing seam roof Low profile, colour matched stainless steel fastener on cladding

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Case Studies - The Common Factor………..

A 25 year + Warranty - to match Design Life Requirements

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Warranty consideration

PV panels - 'payback' period 25 yrs

Fastening system should have25 yr warranty

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Warranty myth - ''fasteners are covered by the system manufacturer ''

Warranty myth - '' it's meaningful''

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Austenitic 304/316 Stainless Steel fasteners and A+ Pink Strip Butyl Sealant

- a meaningful warranty

1. Under the Warranty, the company will make good that section of the roof/cladding by replacement or otherwise, any failure resulting from sealant or fastener non-performance

Backed by Insurance covering consequential losses (£20M per project)

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Specification Support - SFS intec add value

Product / Technical Information Wind loadings / Pull out values NBS Specification System Specification Attachment Clause 197A

Fastener and sealant manufacturers must provide a written warranty of 20 - 30 years and an independent Public Liability Insurance of £20 million per project.'

Accredited Contractors

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Summary - Any questions

SFS intec - a profile Prevention of Corrosion in systems Prevention of Corrosion in Fasteners Stainless Steel vs Carbon Steel Product selection - Structural and Durability Case Histories Solutions & new Technologies Meaningful Warranties The Route to Specification