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BS 8410:2007 Code of practice for lightweight temporary cladding for weather protection and containment on construction works, 2007
- Contents [Go to Page]
- Introduction 1
- 1 Scope 1
- 2 Normative references 1
- 3 Terms and definitions 2
- 4 Selection of lightweight temporary cladding 3
- 5 Precautions to be taken for particular applications 4
- 6 Structural recommendations 8
- 7 Fixings 9
- 8 Erecting and dismantling temporary cladding 10
- 9 Care of lightweight temporary cladding 15
- Annexes
- Annex A (informative) Sources of information relating to LTC products 18
- Annex B (informative) Causes of deterioration of LTC and its fixings 19
- Bibliography 21
- List of figures
- Figure 1 - Typical fixing arrangement for nets and sheets 10
- Figure 2 - Methods of ensuring continuity of cladding 12
- List of tables
- Table A.1 - Properties of containment nets and sheets 18
- Table A.2 - Properties of rigid GRP profiled sheets 18
- Foreword
- Introduction [Go to Page]
- a) assist in the control of the environment, both inside and outside the contained area, so as to minimize health risks;
- b) reduce the impact from environmental effects on the process being carried out in the contained area, in order to improve the quality of the work and productivity;
- c) assist in the containment of debris within construction, refurbishment or maintenance sites;
- d) provide weather protection to those in the contained area;
- e) reduce the risk of injury to people or damage to property by influencing the route of fall of debris and/or objects;
- f) provide improved levels of security;
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- 3.1 attachment point
- 3.2 competent person
- 3.3 containment net
- 3.4 containment sheet
- 3.5 GRP sheet
- 3.6 lightweight temporary cladding (LTC)
- 3.7 tie
- 4 Selection of lightweight temporary cladding [Go to Page]
- NOTE GRP sheets embrittle quite slowly and will retain their strength for many years. [Go to Page]
- a) dimensions of the structure to be clad (height, length, width and lift heights), including a drawing of the structure if possible;
- b) time to be allowed for the cladding to be erected;
- c) time over which the cladding is needed;
- d) confirmation that the structure has been designed for the extra loads that could be applied due to the presence of the cladding [see 4.4a), 4.4b) and 4.4j)];
- e) what operations are going to be carried out from the structure to be clad;
- f) what materials are needed for the operation to be carried out, e.g. chemicals for washing brickwork;
- g) any special needs, for example, flame-retardant materials, dust sheets, noise reduction, complete weather-proof enclosure etc.;
- h) site location and likely climatic conditions.
- a) size, nature and weight of any object(s) to be contained;
- b) additional loading that might be transferred to the structure or access scaffold from the containment net or sheet;
- c) whether the cladding needs to be flame-retardant;
- d) degree of protection required from rain or washing-down operations;
- NOTE 1 Where high dust concentrations occur inside the clad area, consideration should be given to the use of personal protectiv... [Go to Page]
- e) need to prevent dust and debris from escaping to the environment;
- f) need to exclude airborne dust and debris from the work area;
- g) need for ventilation;
- h) possible reaction to chemicals used in facade cleaning, etc.;
- i) need for light transmission;
- j) ability of ties or sheeting to fail at a load below that which would endanger the supporting structure;
- k) area and protection required for safe handling of the LTC;
- l) need for intermittent access through the cladding;
- m) size of sheet, etc., pattern and frequency of attachment points;
- n) ability to retain heat;
- o) availability of independent test data;
- p) level of site security required;
- q) durability of cladding for longer term projects.
- 5 Precautions to be taken for particular applications [Go to Page]
- 5.1 Fixing to scaffolds [Go to Page]
- NOTE 1 If LTC is fixed to the inside of the scaffolding, it could have added implications for the scaffold design.
- NOTE 2 Guard rails provide an additional intermediate fixing position.
- 5.2 Control and retention of fine particles
- 5.3 Control and retention of debris
- 5.4 Controlling the risk from fire [Go to Page]
- 5.4.1 General
- 5.4.2 Containment nets and sheets [Go to Page]
- NOTE GRP sheets are generally unaffected by sparks (see 5.4.3).
- 5.4.3 GRP sheets
- 5.5 Reducing the risk of fire from electrical discharge
- 6 Structural recommendations [Go to Page]
- 6.1 Loading [Go to Page]
- 6.1.1 General
- 6.1.2 Wind loads
- 6.1.3 Impact loads
- 6.2 Strength
- 7 Fixings [Go to Page]
- a) only of a type recommended by the LTC manufacturer or supplier;
- b) used as recommended by the manufacturer/supplier;
- c) of a known breaking strain that will allow the designer to establish a predetermined maximum load on the supporting structure and so prevent too high a load on this supporting structure that could cause damage.
- NOTE Too few fixings can result in a containment net or sheet becoming slack. This can increase the wind load on it and therefore on the supporting structure above that calculated by the designer (see also 6.1).
- 8 Erecting and dismantling temporary cladding [Go to Page]
- 8.1 General [Go to Page]
- NOTE Attention is drawn to the Manual Handling Operations Regulations 1992 [2]. Further information is given in the associated HSE publication L23 [3].
- Figure 1 Typical fixing arrangement for nets and sheets
- 8.2 Supervision and access [Go to Page]
- NOTE 1 Attention is drawn to the legal requirement for safe access for those erecting, dismantling and especially maintaining LTC. [Go to Page]
- a) the correct type of LTC has been supplied (see also 9.3);
- b) LTC is erected with sufficient and suitable overlap or is correctly jointed to ensure continuity as recommended by the manufacturer (see Figure 2);
- c) LTC is erected and maintained at the correct level relative to the working positions;
- d) fixings to the scaffold are adequate as recommended by the manufacturer (see Clause 7);
- e) the scaffold has been designed and erected to carry the LTC;
- f) adequate protection has been provided to guard against the wear caused by wind loading, particularly around sharp edges.
- Figure 2 Methods of ensuring continuity of cladding
- 8.3 Methods of erection [Go to Page]
- 8.3.1 General [Go to Page]
- NOTE 1 Attention is drawn to the Manual Handling Operations Regulations 1992 [2]. NOTE 2 The limitations on the load being carried are related to reach and distance of carry. [Go to Page]
- a) When erecting vertically: [Go to Page]
- 2) the complete scaffolding can be contained at one operation;
- 3) all vertical joints should be tied/stitched;
- 4) the LTC is fixed on the outside face of the scaffold;
- 5) the full weight of the LTC will be held at the top of the scaffolding during erection;
- 6) a predetermined width of LTC will generally be required dependant on the spacing of the scaffold standard.
- b) When erecting horizontally: [Go to Page]
- 2) each scaffold lift can be contained as it is erected and greater control can be maintained over the material;
- 3) selected scaffold lifts can be contained;
- 4) a predetermined width of LTC is needed dependant on the scaffold lift height.
- 8.3.2 Erecting containment nets and sheets vertically
- 8.3.3 Erecting containment nets and sheets horizontally
- 8.3.4 Erecting GRP sheets
- 8.4 Methods of dismantling [Go to Page]
- 8.4.1 Dismantling containment nets and sheets vertically
- 8.4.2 Dismantling containment nets and sheets horizontally
- 8.4.3 Dismantling GRP sheets [Go to Page]
- NOTE If handled with care the sheets can be salvaged for reuse on another scaffold tower.
- 8.5 Disposal of LTC materials [Go to Page]
- NOTE In some cases it might be possible to have the cladding recycled but it might need to be washed before dispatch as the cladding could contain contaminants from the construction site, e.g. cement dusts, mud, paints and greases.
- 9 Care of lightweight temporary cladding [Go to Page]
- 9.1 General [Go to Page]
- NOTE Such damage would normally include cuts of 300 mm, holes with over 100 mm minimum width or torn attachment points.
- 9.2 Protection from damage [Go to Page]
- a) dragging over rough surfaces;
- b) contact with sharp edges;
- c) stacking material on the LTC;
- d) accumulation of debris in the LTC;
- e) persons jumping or throwing objects into the LTC;
- f) chemical attack;
- g) unauthorized interference, particularly the cutting of windows;
- h) walking on LTC.
- NOTE Annex B gives details of potential causes of deterioration.
- 9.3 Inspection
- 9.4 Repairing LTC
- 9.5 Storage
- Annex A (informative) Sources of information relating to LTC products
- Annex B (informative) Causes of deterioration of LTC and its fixings [Go to Page]
- B.1 Temperature
- B.2 Chemical attack
- B.3 Mechanical damage [Go to Page]
- a) protruding transoms, ledgers and bracing;
- b) chafing over scaffold fittings;
- c) incorrect use of fixings;
- d) insufficient fixings used;
- e) temporary repositioning of the cladding;
- f) temporary repositioning of scaffolding components;
- g) building materials stacked in too close proximity;
- h) unstable stacks of building materials;
- i) reduced access for site personnel;
- j) demolition of buildings;
- k) walking on cladding.
- B.4 Strong sunlight
- B.5 Ageing
- Bibliography [Go to Page]
- [1] NATIONAL ACCESS AND SCAFFOLDING CONFEDERATION. Guide to good practice for scaffolding with tubes and fittings. TG 20:05. London: National Access And Scaffolding Confederation, 2005.
- [2] GREAT BRITAIN. Manual Handling Operations Regulations 1992. London: The Stationery Office.
- [3] HEALTH AND SAFETY EXECUTIVE. Manual handling - Manual Handling Operations Regulations 1992 (as amended) - Guidance on regulations. L 23. Sudbury: HSE Books, 2004. [Go to Page]
