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BUILDING (SCOTLAND) ACT 2003 CONSULTATION ON BUILDING REGULATIONS
AND GUIDANCE DOCUMENT: NON DOMESTIC
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Annex 6.P Elemental U-values for limited-life buildings
(without sleeping accommodation)
6.P.0 Introduction
6.P.1 Table of recommended U-values
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annex 6.P
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Elemental U-values for limited-life buildings (without sleeping accommodation)
[Class
Relaxation Direction 141]
6.P.0 Introduction
The table in this Annex is referred to in "General
guidance for non-domestic buildings" (6.0.2b). It is considered appropriate
for use in the design of non-domestic buildings of limited-life (which
do not contain sleeping accommodation) instead of Table 1 to 6.2.1 of
the main document. This is because these buildings only have a short "on-site"
lifespan, which is currently set at five years. It is also possible for
the table below to be used for the design of a notional building, which
is used for comparison purposes in both the Heat Loss Method and the Carbon
Emissions Calculation Method.
Limited-life buildings that contain sleeping accommodation
(e.g. hospital wards and hostels) should use the Table 1 to 6.2.1. There
are two principle reasons for this:
- The residential nature of such buildings
- To promote an ongoing improvement in the stock of portable buildings
(where these are used for limited-life purposes)
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6.P.1 Maximum U-values of building elements when
using the Elemental Method for non-domestic buildings of limited-life
(without sleeping accommodation) [CRD 141]
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Building element
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Maximum U-value (W/m2K)
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Pitched roof - with insulation between rafters [Note 4]
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0.45
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Pitched roof - with insulation between joists [Note 4]
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0.25
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Pitched roof — with integral insulation [Note 4]
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0.45
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Flat roof [Note 4]
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0.45
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External wall [Note 2]
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0.45
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Floor
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0.45
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Semi-exposed walls [Notes1 and 2] and floors [Note 1]
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0.6
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Windows, personnel doors and rooflights (area weighted average
for the whole building) [Note 3]
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3.3
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Vehicle access and similar large doors [Note 5]
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0.7
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Notes:
- Semi-exposed in this table means an element between a building to
which Section 6 applies and a building or part of a building to which
it does not apply.
- Solid area of element only (i.e. excluding windows and doors).
- For methods of calculation, see Annex 6.A
and Annex 6.E
- Solid area of element only (i.e. excluding rooflights).
- No maximum U-value necessary where for operational reasons, doors
have to be left open when building is in use.
- U-values for elements containing repeating thermal bridges should
be calculated in accordance with CIBSE Design Guide A: 1980, Section
A3.
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