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» Category: RdSAP Conventions for SAP 2009 v9.91 - Issued 6 January 2012 (v5.0)  (Go back)

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1.01 Use of RdSAP
RdSAP is for existing dwellings only. Any new dwelling, including dwellings created by change of use, must be assessed using SAP. Note. An exception is a new dwelling in Scotland for which the bui...
1.02 Flat or maisonette
A dwelling that does not extend to all storeys of the building is a flat or maisonette. RdSAP makes no distinction between flats and maisonettes as regards calculations; it is acceptable to select eit...
2.01 Measurements
Measure all perturbations (e.g. bay windows) but disregard chimney breasts unless assessor considers significant e.g. large inglenook.
2.02 Precision of lengths
Measure to one decimal place (0.1 m) or better. Retain higher precision when that has been measured (especially room heights).
2.03 Sheltered wall length (unheated corridors)
Include in the heat loss perimeter. When a dwelling (flat or maisonette) has a sheltered wall to an unheated corridor on more than one storey the sheltered length is the total for all storeys with a ...
2.04 Habitable room count
For a kitchen to be a kitchen/diner it must have space for a table and 4 chairs. A lounge/dining room where the door was temporarily removed (i.e. architrave and hinges still there) is two habitable ...
2.05 Roof rooms / Attics (whether to include in the assessment and rules for detailed measurements)
Include when accessed via a permanent fixed staircase such that one is able to walk downwards facing forwards. Does not necessarily contain habitable rooms. For a roof room to be classed as such and ...
2.07 Rooms within a Mansard roof
A storey having non-vertical walls of at least 70° pitch constitutes a separate storey; it is not treated as roof rooms. Use alternative wall if appropriate
2.08 Whole dwelling within roof
When property is a single storey entirely located within a roof, model as: - lowest occupied level - timber frame construction of appropriate age band - room height must be entered as 2.2 m - include ...
2.09 Porches (whether to include in the assessment)
If heated always include (separated or not). If external and not heated, disregard. If internal, not heated and thermally separated, disregard.
2.10 Mezzanine floor
Enter the part of the property above and below the mezzanine deck as a two storey extension. Treat the remaining part as a single level with the full floor to ceiling/roof height. If the mezzanine is...
2.11 Vertical extension
Enter the new upper floor as an extension with “same dwelling below” and the original part with “same dwelling above” for the roof description. Where an extension has been built over part of the exis...
2.12 More than 4 extensions
Add together floor areas and exposed perimeters of extensions (or add extension to main dwelling) to reduce to four extensions. Combine parts having the most similar age bands (refer to SAP Appendix S...
2.13 Alternative wall
In determining whether an alternative wall is applicable the significant features are construction type, age band and insulation. Walls of the same construction but different thickness within a buildi...
2.14 Window area
In RdSAP the definition of what is a window and what is a door is defined by the area of glazing in relation to the area of the whole opening, i.e. door and frame. To be classed as a window a glazed d...
2.15 Glazed area
Consider the whole dwelling (windows, glazed doors and roof lights), including any extensions (but not conservatories). Typical applies if the surface area of the glazing in the dwelling is essential...
2.16 Secondary glazing
If single glazing with secondary glazing, record as secondary glazing. If double glazing with secondary glazing, record as newer double glazing (newer double glazing means 2002 or later in E&W, 2...
2.17 Sun room
For a highly glazed part of the dwelling, such as a sun room, which does not meet the criteria for a conservatory (50% of walls and 75% of roof glazed), in most cases use the glazing option of “more t...
2.18 Basements
Do not mix internal and external measurements. If a basement is included in the assessment, it is likely that internal dimensions will be used throughout the dwelling.
2.19 Store rooms and utility rooms (whether to include in the assessment)
If heated always include. If accessible only via a separate external door and not heated, disregard If directly accessible, not heated and thermally separated, disregard
2.20 Garages (whether to include in the assessment)
If heated from main heating system, always include. The presence of a boiler within the garage does not make it heated.
2.21 Dwelling adjacent to commercial premises
If a dwelling or part of a dwelling has commercial premises below record as partially heated space below. If a dwelling or part of a dwelling has commercial premises above record as another dwelling ...
2.22 Wall thickness (per building part)
Measure wall thickness in mm of each external wall (elevation) and any alternative wall within a building part. It can be measured at door or window reveals or by internal/external measurement compari...
3.01 Cavity wall type
Where a cavity wall has been identified, enter as such irrespective of the width of the cavity.
3.02 System build type
If there is a system built wall that has evidence of retro cavity fill, record as system build with internal insulation and include Addendum 1.
3.03 “Unknown” wall insulation
Do not use the “unknown” option for wall insulation inappropriately as this automatically suppresses any insulation recommendation; assume as-built if no evidence of retro-fitted insulation. “Unknown...
3.04 Loft insulation
If joist and rafter insulation are both present record joist insulation only. If loft is fully boarded enter unknown unless householder has documentary evidence (maximum thickness is depth of joists)...
3.05 Age band for conversions
For a conversion which was a change of use (e.g. barn converted to dwelling) enter conversion date as the age of construction. For a conversion where a dwelling is sub-divided (e.g. house to flats) u...
3.06 Internal wall lining (creating an airspace behind)
This includes any type of internal lining that creates an airspace behind it, e.g. plasterboard on dabs, lath and plaster. Use tap test for plaster board on dabs or on battens. If tap test is inconclu...
3.07 Internal or external insulation for walls Floor insulation Rafter or flat roof insulation
If insulation is multifoil or foam insulation the thickness is entered as double the actual thickness. This is the same convention as for insulation at joists. If there is both internal and external w...
3.08 U-value entry (walls, roofs, floors)
The U-value is that of the whole element, including any added insulation. Documentary evidence applicable to the property being assessed (see convention 9.02) must be provided and recorded if overwrit...
3.09 External doors
An external door is a door that forms part of the heat loss perimeter of the dwelling. See 2.14 for treatment of highly glazed doors. A door to a heated access corridor is not included in the door cou...
3.10 Windows (U-values and g-values)
U-values and g-values can be overwritten only if documentary evidence is provided, which can be either a Window Energy Rating certificate (as defined by BFRC) or manufacturer’s data. The U-value is fo...
3.11 Draught proofing (of windows and doors)
All external doors and at least 2 windows per building part should be examined. If a window is locked or inaccessible then endeavour to check another one. If the state of the draught proofing cannot b...
4.01 Heat emitters
If one heating system feeds both underfloor and radiators, enter radiators. This is because if radiators are present there has to be a higher flow temperature.
4.02 Storage heaters
If storage heaters are present as main heating but single meter – enter as panel heaters and include addendum 6. If the storage heaters are fan-assisted suppress the recommendation for fan-assisted st...
4.03 Boiler missing or not working
If boiler/heating system is present but not working (or condemned) it should still be entered as the main heating system. If boiler not present but intended – enter no heating system.
4.04 Micro-CHP
If micro-CHP and the system cannot be found in the database enter as condensing boiler and include addendum 5.
4.05 Definition of community heating
A system that serves more than one dwelling.
4.06 Fuel used by community heating
Try to find out what the fuel is. If it cannot be ascertained select mains gas.
4.09 Two main systems
There is an option for two main systems to cover the situation of different systems heating different parts of the dwelling. If main system 1 heats all habitable rooms, there is no main system 2 unle...
4.10 Liquid biofuels
Used only for appliances selected from the database.
4.11 LPG subject to special condition 18
Applies only if documentary evidence confirms that the property receives LPG at mains gas prices.
5.01 Secondary heating
Include if fixed emitter present regardless of whether main system(s) heat all rooms. If more than one secondary: select the device that heats greatest number of habitable rooms. If the same choose ...
5.02 Open fireplaces (for heating)
An open fireplace is to be considered in the heating assessment if capable of supporting an open fire, even if no fuel is present. The fuel to be specified is smokeless fuel in smoke control areas and...
5.03 Fuels for solid fuel fires and room heaters
If it can burn only one fuel, specify that fuel (includes exempted appliances burning wood in Smoke Control Areas). Otherwise: Smoke control area: Open fire - smokeless fuel; closed heater - anthraci...
6.03 Dual immersion with single tariff
Enter as a single immersion and include addendum 6.
6.04 Separate boiler for DHW
Sometimes there is a separate boiler providing DHW only. A generic boiler can be selected from the water heating options. If the boiler is located in the database, specify two main heating systems wit...
7.01 Low energy lights
LEDs are considered as low energy lights. Where there are 4 or more downlighters / ceiling lights divide the bulb count by 2. Include fixed under-cupboard kitchen strip lights.
8.01 Suppression of recommendations
Recommendations should be removed only if there is evidence, visual or documentary, showing that a specific recommendation is not appropriate. The EPC contains caveats to the effect that further guida...
8.02 Mains gas available
Only if a gas meter or a gas burning appliance (e.g. gas cooker) is within the property. A closed-off gas pipe does not count. Where a boiler is present attached to a heating system (not in a box), a...
9.01 Open fireplace count (for ventilation)
Include all open chimneys/fireplaces in the fireplace count (both downstairs and upstairs). The definition is a vertical duct with a flue diameter of at least 200 mm or its equivalent. The following a...
9.02 Documentary evidence
Acceptable documentary evidence includes certificates, warranties, guarantees, building regulation submissions and official letters from the applicable Registered Social Landlord (RSL). The assessor m...
9.03 Lodgement of incorrect EPC
If you lodge an EPC in error and lodge a corrected EPC, inform your accreditation scheme so that the erroneous one can be marked “not for issue”.
9.04 Cooling system present
Fixed systems only, do not include reversible heat pumps.
9.05 Photovoltaics
If photovoltaics are present, look for the schematic which is usually adjacent to the electricity meter. The schematic should state the peak power (kWp) of the PV array. Record the following: - kWp; ...
9.06 Flue gas heat recovery
Include only if found in database, identified in same way as for heating systems. When the model cannot be found no default option is available but the presence of the device should be recorded in sit...
9.07 Wind turbine
Documentary evidence is required to overwrite default values.
9.08 Waste water heat recovery
Include only if found in database. When the model cannot be found no default option is available but the presence of the device should be recorded in site notes. Number of rooms with bath and/or showe...
9.09 Solar water heating
Documentary evidence is required to over-write collector or solar store values except that orientation, tilt and overshading can be overwritten with visual evidence. If the panel/collector details are...
9.10 Hard to treat cavity walls
An access issue is any façade where it is not possible to pitch a 5 metre ladder considering health and safety requirements. This includes e.g. a narrow passageway, a busy thoroughfare a building of m...
 

 

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