Documentation of the component 29. January ... - WordPress.com

nühaus GmbH 14 Rue Marignac PO Box 12111 Geneva 12 Switzerland Independently calculated & verified by Bennett Robertson Design, Belfast

Documentation of the component Calculation according BS EN ISO 13788 Source: Custom - nuhaus Component: nuhaus Wall Render Board OUTSIDE

29. January 2013 Page 1/3

INSIDE

The list of material layers shown below may differ from those in the U-value calculation printout. Only material layers which are used in the Condensation Risk Analysis are listed. This calculation of the Condensation risk analysis according to BS EN ISO 13788:2002 has been performed on a construction containing inhomogeneous layers. This calculation is only valid through the selected section. It is advisable that you should also select the alternative position and recalculate the Condensation Risk Analysis for a more complete assessment of the construction.

Assignment: External wall Name Render, cement and sand Render Pro Board Low E cavity - 25 mm, ventilated TF200 Thermo membrane Oriented strand board (OSB) Polyurethane - Variable thickness Oriented strand board (OSB) Polyethylene 0.25 mm

Thickn. [m] 0.0050 0.0120 0.0250 0.0001 0.0120 0.1260 0.0120 0.0003

lambda [W/(mK)] 1.000 0.260 0.025 0.170 0.130 0.025 0.130 0.170

Unventilated air layer: 25 mm, horiz. heat flow Gyproc Wallboard Paint - emulsion

0.0250 0.0125 0.0001

0.139 0.160 0.200

Q .. .. .. .. .. ..

Q

µ [-] 6.00 30.00 1.00 2000.00 30.00 50.00 30.00 400000.0 0 1.00 4.00 1000.00

Q

sd [m] 0.03 0.36 0.03 0.20 0.36 6.30 0.36 100.00

R [m²K/W] 0.0050 0.0462 1.0000 0.0006 0.0923 5.0400 0.0923 0.0015

0.03 0.05 0.10

0.1799 0.0781 0.0005

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.

Calculated with BuildDesk 3.4.4

nühaus GmbH 14 Rue Marignac PO Box 12111 Geneva 12 Switzerland Independently calculated & verified by Bennett Robertson Design, Belfast

Documentation of the component Calculation according BS EN ISO 13788 Source: Custom - nuhaus Component: nuhaus Wall Render Board

29. January 2013 Page 2/3

Condensation risk analysis - summary of main results Calculation according BS EN ISO 13788 Surface temperature to avoid critical surface moisture: No danger of mould growth is expected.

Interstitial condensation: No condensation is predicted at any interface in any month.

Interstitial condensation and evaporation per month gc [g/m²]

1.00 0.50 0.00 -0.50 -1.00 Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Component, condensation range

CRA calculations according to BS EN ISO 13788:2002 are used as a guide in predicting interstitial condensation. This methodology uses some simplifications of the dynamic processes involved and subsequently does have some limitations. Further information can be found in Information Paper IP 2/05 'Modelling and controlling interstitial condensation in buildings'' Feb 2005.

Calculated with BuildDesk 3.4.4

nühaus GmbH 14 Rue Marignac PO Box 12111 Geneva 12 Switzerland Independently calculated & verified by Bennett Robertson Design, Belfast

Documentation of the component Calculation according BS EN ISO 13788 Source: Custom - nuhaus Component: nuhaus Wall Render Board

29. January 2013 Page 3/3

Surface temperature to avoid critical surface humidity Calculation according BS EN ISO 13788 Location: Glasgow; Humidity class according BS EN ISO 13788 annex A: Dwellings with low occupancy Month




January February March April May June July August September October November December

1 Te [°C] 3.7 3.9 5.4 7.4 10.5 13.2 14.9 14.4 11.9 9.1 5.8 4.4

2 phi_e --0.850 0.820 0.790 0.730 0.720 0.740 0.760 0.780 0.810 0.830 0.850 0.860

3 Ti [°C] 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0

4 phi_i --0.600 0.590 0.581 0.562 0.572 0.610 0.648 0.654 0.637 0.618 0.606 0.605

5 pe [Pa] 676 662 708 751 914 1122 1287 1279 1128 959 784 719

6 delta p [Pa] 726 717 650 561 423 303 227 249 361 486 633 695

7 pi [Pa] 1403 1379 1359 1313 1337 1425 1514 1528 1489 1444 1416 1414

8 ps(Tsi) [Pa] 1753 1724 1698 1641 1671 1782 1893 1911 1861 1806 1770 1767

9 Tsi,min [°C] 15.4 15.2 14.9 14.4 14.7 15.7 16.6 16.8 16.4 15.9 15.6 15.6

10 fRsi --0.720 0.700 0.654 0.556 0.442 0.366 0.341 0.426 0.552 0.624 0.689 0.716

The critical month is January with fRsi,max = 0.720 fRsi = 0.963

fRsi > fRsi,max, the component complies. Nr 1 2 3 4 5 6 7 8

Explanation External temperature External rel. humidity Internal temperature Internal relative humidity External partial pressure p e = e * psat(Te); psat(Te) according formula E.7 and E.8 of BS EN ISO 13788 Partial pressure difference. The security factor of 1.10 according to BS EN ISO 13788, ch.4.2.4 is already included. Internal partial pressure p i = i * psat(Ti); psat(Ti) according formula E.7 and E.8 of BS EN ISO 13788 Minimum saturation pressure on the surface obtained by psat(Tsi) = p i / si, where si = 0.8 (critical surface humidity) 9 Minimum surface temperature as function of psat(Tsi), formula E.9 and E.10 of BS EN ISO 13788 10 Design temperature factor according 3.1.2 of BS EN ISO 13788 11 Internal surface temperature, obtained from Tsi = Ti - Rsi * U * (Ti - Te ) 12 External surface temperature, obtained from Tse = Te + Rse * U * (Ti - Te )

Calculated with BuildDesk 3.4.4

11 Tsi [°C] 19.4 19.4 19.5 19.5 19.7 19.8 19.8 19.8 19.7 19.6 19.5 19.4

12 Tse [°C] 3.8 4.0 5.5 7.5 10.6 13.2 14.9 14.4 11.9 9.2 5.9 4.5