BS 5250:2002 2005
$215.11
Code of practice for control of condensation in buildings
| Published By | Publication Date | Number of Pages |
| BSI | 2005 | 90 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British Standard |
| 3 | Contents |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions airtight layer ! high water vapour resistance (type HR) underlay |
| 8 | low water vapour resistance (type LR) underlay condensate condensation interstitial condensation surface condensation harmful condensation inconsequential condensation nuisance condensation reverse condensation cooler side dewpoint evaporation hygroscopic material |
| 9 | moisture content by weight moisture content of air night sky radiation passive stack ventilation pattern staining relative humidity sarking boards saturation vapour pressure sheet sarking sponge effect thermal bridge |
| 10 | vapour control layer vapour diffusivity vapour pressure vapour resistance vapour resistivity vented air space ventilated air space ventilation rate warmer side water vapour |
| 11 | 4 Behaviour of water vapour in the air Relationship between air temperature, vapour pressure and relative humidity |
| 12 | 5 Causes of condensation 5.1 General 5.2 Causes of surface condensation 5.3 Causes of interstitial condensation |
| 14 | 6 The effects of condensation and high humidity 6.1 General 6.2 Condensate on surfaces 6.3 Mould growth |
| 15 | 6.4 Interstitial condensation 7 Design principles 7.1 General |
| 16 | Balance of factors 7.2 Occupant activity and heating and ventilation regime 7.3 Building configuration |
| 17 | 7.4 Construction 7.5 Heating and ventilation |
| 18 | 7.6 Heating and ventilation costs 7.7 Risk assessment |
| 19 | Effect of condensate on an impermeable surface 8 Application of design principles: building fabric 8.1 General |
| 20 | 8.2 Vapour control layers 8.3 Walls |
| 22 | Masonry cavity wall |
| 23 | Solid wall: internal insulation Solid wall: external insulation |
| 25 | Framed wall Framed wall with tile cladding |
| 26 | Warm steel frame wall |
| 27 | Steel frame wall with frame within the insulation |
| 28 | Site assembled metal wall Composite panel wall 8.4 Roofs |
| 31 | Maximum retention of condensate before running or dripping on different underlay types, in g/m2 |
| 33 | Pitched roof with insulation on a horizontal ceiling – Ventilated below the underlay |
| 34 | Pitched roof – Large ventilated void above the insulation and a type LR underlay unsupported with an air-open roof covering (see 8.4.2.1.2) |
| 35 | Pitched roof – Large ventilated void above the insulation and a type LR underlay unsupported with a tight roof covering (see 8.4.2.1.2) Pitched roof – Large ventilated void above the insulation and a type LR underlay supported on sarking boards |
| 36 | Minimum equivalent continuous low level loft space ventilation openings with LR underlays |
| 38 | Pitched roof – Small ventilated void above insulation and a type HR underlay |
| 39 | Pitched roof – No void above insulation and a type LR underlay |
| 40 | Pitched roof – Small void above insulation and a type LR underlay |
| 41 | Ventilation positions for room in the roof construction requiring ventilation |
| 42 | Ventilation positions for room-in-roof construction including a flat roofed dormer window |
| 43 | Ventilation positions for roofs with dormers |
| 44 | Framed flat roof: cold type |
| 45 | Framed continuous membrane roof: warm type |
| 46 | Framed continuous membrane roof: warm type inverted |
| 47 | Concrete continuous membrane roof: cold type Concrete continuous membrane roof: warm type |
| 48 | Concrete flat roof: warm type inverted |
| 49 | Site assembled metal roof |
| 50 | Composite panel roof |
| 51 | 8.5 Floors |
| 52 | Timber suspended ground floor |
| 53 | Precast concrete suspended ground floor |
| 54 | Solid ground floors |
| 55 | Timber deck with external finish of low vapour resistance Solid externally exposed floor |
| 56 | 8.6 Thermal bridging |
| 57 | 8.7 Windows |
| 58 | Standard glazing unit Drained glazing unit 8.8 Roof lights 8.9 Condensation on internal fittings |
| 59 | 8.10 Cupboards on external walls 9 Application of design principles: heating 9.1 General 9.2 Warm air heating |
| 60 | 9.3 Hot water radiators 9.4 High temperature radiant heaters 9.5 Electric storage heaters 9.6 Low temperature radiant heaters 9.7 Unflued oil and gas heaters 9.8 Open fires and solid fuel burning stoves 9.9 Heating controls |
| 61 | 10 Application of design principles: ventilation 10.1 General 10.2 Natural ventilation 10.3 Passive stack ventilators |
| 62 | 10.4 Forced ventilation 10.5 Mechanical supply ventilation systems 10.6 Mechanical ventilation with heat recovery |
| 63 | 10.7 Heated drying cupboards 10.8 Dehumidifiers 11 Diagnosis and remedial work 11.1 General 11.2 Diagnosis of dampness |
| 65 | 11.3 Damage caused by dampness |
| 66 | 11.4 Remedial works |
| 67 | 11.5 Mould growth 12 Particular aspects 12.1 Initial period at commencement of re-use 12.2 Thermal insulating materials 12.3 Furniture 12.4 Larders and unheated stores 12.5 Redecoration 12.6 Heating |
| 68 | 12.7 Ventilation 12.8 Drying clothes 13 Precautionary measures during construction 13.1 Construction information 13.2 Site checks |
| 69 | 14 Building user information 14.1 Owner’s manual |
| 70 | 14.2 Particular aspects |
| 72 | (normative) The interrelationship of moisture contents and temperatures (normative) The interrelationship of moisture contents and temperatures |
| 73 | Example of use of the psychrometric chart |
| 74 | Saturation vapour pressures for air temperatures 30.9 °C to -20 °C |
| 75 | Psychrometric chart |
| 76 | (normative) Moisture generation and ventilation in occupied buildings (normative) Moisture generation and ventilation in occupied buildings Housing Typical moisture generation rates for household activities Typical moisture generation rates from heating fuels |
| 77 | Daily moisture generation rates for households Typical ventilation rates Other buildings |
| 78 | Variation of internal humidity classes with external temperature Internal humidity classes: building types and limiting relative humidities at Te = 0 °C |
| 79 | (normative) Material properties (normative) Material properties Thermal conductivities and vapour resistivities |
| 80 | Thermal conductivities and vapour resistivities |
| 81 | Thermal conductivities and vapour resistivities (continued) |
| 82 | Vapour resistances |
| 83 | Thermal resistances for surfaces and air spaces |
| 84 | (normative) Calculation methods (normative) Calculation methods General Surface condensation and mould growth Interstitial condensation Principle” |
| 85 | External climate data Monthly mean temperature and relative humidity for interstitial condensation calculations (1983-2002) |
| 86 | Corrections to monthly mean temperatures and relative humidities from a mean year to achieve condensation risk years with various return periods Calculation of condensation risk in pitched roofs with a large void above the insulation |
| 87 | (informative) Vapour resistances: Conversion factors for unusual units (informative) Vapour resistances: Conversion factors for unusual units Factors for converting unusual permeance units to »g/N·s |
