Abstract
Cold pitched roofs, with their form of construction situating insulation on a horizontal ceiling, are intrinsically vulnerable to condensation. This study reports the results derived from using a simulation package (Heat, Air and Moisture modelling tool, or HAM-Tools) to investigate the risk of condensation in cold pitched roofs in housing fitted with a vapour-permeable underlay (VPU) of known characteristics. In order to visualize the effect of the VPUs on moisture transfer, several scenarios were modelled, and compared with the results from a conventional bituminous felt with high resistance (200 MNs/g, Sd = 40 m). The results indicate that ventilation is essential in the roof to reduce condensation. However, a sensitivity analysis proved that reducing the overall tightness of the ceiling and using lower-resistance VPUs would help in controlling condensation formation in the roof.
| Original language | English |
|---|---|
| Pages (from-to) | 117-128 |
| Number of pages | 12 |
| Journal | Building Research and Information |
| Volume | 37 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Jan 2009 |
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Keywords
- condensation
- cold pitched roofs
- construction
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Condensation and moisture transport in cold roofs: effects of roof underlay. / Essah, Emmanuel A.; Sanders, Chris H.; Baker, Paul H.; Kalagasidis, Angela S.
In: Building Research and Information, Vol. 37, No. 2, 01.01.2009, p. 117-128.Research output: Contribution to journal › Article
TY - JOUR
T1 - Condensation and moisture transport in cold roofs: effects of roof underlay
AU - Essah, Emmanuel A.
AU - Sanders, Chris H.
AU - Baker, Paul H.
AU - Kalagasidis, Angela S.
N1 - <p>Originally published in: Building Research and Information (2009), 37 (2), pp.117-128.</p>
PY - 2009/1/1
Y1 - 2009/1/1
N2 - Cold pitched roofs, with their form of construction situating insulation on a horizontal ceiling, are intrinsically vulnerable to condensation. This study reports the results derived from using a simulation package (Heat, Air and Moisture modelling tool, or HAM-Tools) to investigate the risk of condensation in cold pitched roofs in housing fitted with a vapour-permeable underlay (VPU) of known characteristics. In order to visualize the effect of the VPUs on moisture transfer, several scenarios were modelled, and compared with the results from a conventional bituminous felt with high resistance (200 MNs/g, Sd = 40 m). The results indicate that ventilation is essential in the roof to reduce condensation. However, a sensitivity analysis proved that reducing the overall tightness of the ceiling and using lower-resistance VPUs would help in controlling condensation formation in the roof.
AB - Cold pitched roofs, with their form of construction situating insulation on a horizontal ceiling, are intrinsically vulnerable to condensation. This study reports the results derived from using a simulation package (Heat, Air and Moisture modelling tool, or HAM-Tools) to investigate the risk of condensation in cold pitched roofs in housing fitted with a vapour-permeable underlay (VPU) of known characteristics. In order to visualize the effect of the VPUs on moisture transfer, several scenarios were modelled, and compared with the results from a conventional bituminous felt with high resistance (200 MNs/g, Sd = 40 m). The results indicate that ventilation is essential in the roof to reduce condensation. However, a sensitivity analysis proved that reducing the overall tightness of the ceiling and using lower-resistance VPUs would help in controlling condensation formation in the roof.
KW - condensation
KW - cold pitched roofs
KW - construction
U2 - 10.1080/09613210802645973
DO - 10.1080/09613210802645973
M3 - Article
VL - 37
SP - 117
EP - 128
JO - Building Research and Information
JF - Building Research and Information
SN - 0961-3218
IS - 2
ER -