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Documentation of the component 16. June 2011Thermal transmittance (U-value) according to BS EN ISO 6946Source: own catalogue - SPAB 2010-11Component: 4. 2011 StAnnesRd_Eastwall

Calculated with BuildDesk 3.4.4

OUTSIDE INSIDE

This illustration of inhomogeneous layers is provided only to assist in visualising the arrangement.

On the basis of the given information about the inhomogeneous layers, it is not possible to estimate how and where bearing elements intersect each other. It was assumed that the layers intersect crosswise. The size of the areas was calculated corresponding to their percentage of the whole area.

Assignment: External wall

Manufacturer Name Thickness[m], number

Lambda[W/(mK)]

Q R[m!K/W]

Rse 0.04001 BS EN 12524 Render, lime and sand 0.0400 0.800 0.05002 Generic Building Materials Brick outer leaf & Mortar inner leaf (f = 0.000 /

automatic disregarding acc. BRE 4.4.3)0.1070 0.770 0.1390

3 Generic Building Materials Brick inner leaf & Mortar inner leaf (f = 0.000 / automatic disregarding acc. BRE 4.4.3)

0.1080 0.560 0.1929

4 BS EN 12524 Render, lime and sand 0.0300 0.800 0.03755 BS EN ISO 6946 Unventilated air layer: 50 mm, horiz. heat flow 0.0500 0.278 0.17996 Inhomogeneous material layer consisting of: 0.1000 ø 0.046 2.17406a Sheeps Wool 92.31 % 0.039 -6b BS EN 12524 Softwood Timber [500 kg/m"] 07.69 % 0.130 -7 Inhomogeneous material layer consisting of: 0.0500 ø 0.046 1.08707a Sheeps Wool 92.31 % 0.039 -7b BS EN 12524 Softwood Timber [500 kg/m"] 07.69 % 0.130 -8 Generic Building Materials Standard wallboard plasterboard 0.0125 0.210 0.05959 BS EN 12524 Gypsum plastering 0.0030 0.570 0.0053

Rsi 0.13000.5005

RT = (RT ' + RT '')/2 = 4.24 m!K/W U = 1/RT = 0.24 W/(m!K) Q .. The physical values of the building materials has been graded by their level of quality. These 5 levels are the following

.. A: Data is entered and validated by the manufacturer or supplier. Data is continuously tested by 3rd party.

.. B: Data is entered and validated by the manufacturer or supplier. Data is certified by 3rd party

.. C: Data is entered and validated by the manufacturer or supplier.

.. D: Information is entered by BuildDesk without special agreement with the manufacturer, supplier or others.

.. E: Information is entered by the user of the BuildDesk software without special agreement with the manufacturer, supplier or others.

Umax = 0 . 30 W/(m!K) U = 0 . 24 W/(m!K) RT= 4 . 24 m!K/WSource of Umax value:

England, Wales: Approved Document L1B (2006), Table 3(a) - Existing Dwellings

Page 1/2

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Project: Postlebury Farm Site: Cloford, Frome, Somerset, BA11 4PF Client: Kevin McCloud

!

Document prepared by: ArchiMetrics Page | 4 Status: Interim 6/6/11

!

Fig. 3. Moisture gradient monitor installed at location 1.

Drilling work required for the placement of interstitial moisture monitoring sensors (see Figure 3) revealed that none of the three walls contained a rubble core and instead these walls were of double skin, fair-faced construction. The visual survey revealed an apparent absence of tie-stones in the wall construction. An exposed wall-head of the Annexe building confirms the two skins construction method for this part of the complex, see Figure 4.

Figure 4. View of wall head of Annexe buildings at Postlebury Farm

Photographs were taken of the three principal walls under investigation in order to determine a stone to mortar ratio for the walls to be included in an informed U-value calculation, see Appendix A. Using the ratios suggested by these images (and further refined using Dr Paul Baker's work on mortar ratios for Historic Scotland) mortar ratios were determined for the principal parts of Postlebury stone walls.

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In situ U-value 1.34 W/m2K

Calculated U-value 3.02 W/m2K

R#&@=<%()!

Documentation of the component 11. October 2010Thermal transmittance (U-value) according to BS EN ISO 6946Source: own catalogue - CarolineComponent: 11B

Calculated with BuildDesk 3.4.4

OUTSIDE INSIDE

Assignment: External wallManufacturer Name Thickness

[m],number

Lambda[W/(mK)]

Q R[m²K/W]

Rse 0.041 BS EN 12524 Limestone, soft 0.310 1.100 0.282 BS EN 12524 Gypsum plastering 0.015 0.570 0.03

Rsi 0.130.325

RT = Rsi + Ri + Rse = 0.48 m²K/W U = 1/RT = 2.09 W/(m²K) Q .. The physical values of the building materials has been graded by their level of quality. These 5 levels are the following

.. A: Data is entered and validated by the manufacturer or supplier. Data is continuously tested by 3rd party.

.. B: Data is entered and validated by the manufacturer or supplier. Data is certified by 3rd party

.. C: Data is entered and validated by the manufacturer or supplier.

.. D: Information is entered by BuildDesk without special agreement with the manufacturer, supplier or others.

.. E: Information is entered by the user of the BuildDesk software without special agreement with the manufacturer, supplier orothers.

Umax = 0.35 W/(m²K) U = 2.09 W/(m²K) RT= 0.48 m²K/WSource of Umax value:

England, Wales: Approved Document L1A (2006), Table 2 - New Build Dwellings

Page 1/1

In situ U-value 1.34 W/m2K

Calculated U-value 2.09 W/m2K

ID Build Up mm In situ U-value BR 443 U-value 1c Lime Plaster

Brick Infill Lime Render

134.5

2.48

2.49 1h Lime Plaster

Hemcrete Timber Stud

162

0.77

0.71 11a Lime Plaster

Straw/Clay Clay/lime plaster

325

0.28

0.30 16a Lime Plaster

Straw Bale Lime Render

435

0.16

0.16 20a Brick

Lime Plaster Gypsum Skim

380

1.48

1.52 20c Brick

Lime Plaster Gypsum Skim

248

2.13

2.10 24c Asbestos Sheet

Mineral Wool Plasterboard & Skim

105

0.46

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RdSAP 2009 version 9.90 (March 2011)

119

S5.1 U-values of walls

Table S6 : Wall U-values – England and Wales

Age band A B C D E F G H I J K Wall type Stone: granite or whin (as built) 2.4 2.4 2.4 2.4 1.7 1.0 0.60 0.60 0.45 0.35 0.30

Stone: sandstone (as built) 2.1 2.1 2.1 2.1 1.7 1.0 0.60 0.60 0.45 0.35 0.30

Solid brick (as built) 2.1 2.1 2.1 2.1 1.7 1.0 0.60 0.60 0.45 0.35 0.30

Stone/solid brick (external insulation) 0.60 0.60 0.60 0.60 0.55 0.45* 0.35* 0.35* 0.30* 0.25* 0.21*

Stone/solid brick (internal insulation) 0.60 0.60 0.60 0.60 0.55 0.45* 0.35* 0.35* 0.30* 0.25* 0.21*

Cob (as built) 0.80 0.80 0.80 0.80 0.80 0.80 0.60 0.60 0.45 0.35 0.30 Cob (external insulation) 0.40 0.40 0.40 0.40 0.40 0.40 0.35* 0.35* 0.30* 0.25* 0.21*

Cob (internal insulation) 0.40 0.40 0.40 0.40 0.40 0.40 0.35* 0.35* 0.30* 0.25* 0.21*

Cavity (as built) 2.1 1.6 1.6 1.6 1.6 1.0 0.60 0.60 0.45 0.35 0.30 Filled cavity+ 0.50 0.50 0.50 0.50 0.50 0.40 0.35 0.35 0.45† 0.35† 0.30† Timber frame (as built) 2.5 1.9 1.9 1.0 0.80 0.45 0.40 0.40 0.40 0.35 0.30 Timber frame (internal insulation) 0.60 0.55 0.55 0.40 0.40 0.40 0.40† 0.40† 0.40† 0.35† 0.30†

System build (as built) 2.0 2.0 2.0 2.0 1.7 1.0 0.60 0.60 0.45 0.35 0.30

System build (external insulation) 0.60 0.60 0.60 0.60 0.55 0.45 0.35* 0.35* 0.30* 0.25* 0.21*

System build (internal insulation) 0.60 0.60 0.60 0.60 0.55 0.45 0.35* 0.35* 0.30* 0.25* 0.21*

* wall may have had internal or external insulation when originally built; this applies only if insulation is known to have been increased subsequently (otherwise “as built” applies)

+ cavity wall with internal or external insulation to be treated as filled cavity wall for the purposes of the SAP calculation. † assumed as built

Wall types

Where a cavity wall has been identified, enter as such irrespective of the width of the cavity..

If there is a system built wall that has evidence of retro cavity fill, record as system build with internal 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” should be used only in exceptional circumstances, e.g. when there is conflicting evidence (inspection and/or documentary) of added insulation whose presence cannot be ascertained conclusively. In these cases clarification must be provided in site notes.

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U-VALUE REPORT REVISED OCTOBER 2011.

Dr Caroline Rye

! © Society for the Protection Ancient Buildings 2011. www.spab.org.uk

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THE SPAB RESEARCH REPORT 2.

The SPAB Building Performance Survey 2011

Interim Report

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Dr Caroline Rye & Diane Hubbard

© Society for the Protection Ancient Buildings 2011. www.spab.org.uk

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