Risk of Moisture in Diffusionally Open Roofs with Cross-Laminated Timber for Northern Coastal Climates

Agnieszka Sadłowska-Sałęga , Krzysztof Wąs

Abstract

The paper is an attempt to answer the question whether the material-optimized roof construction using cross-laminated timber (CLT) is safe in terms of moisture content in the demanding northern costal climates. The proposed roof structure meets the strength requirements. The partition is diffusionally open, which facilitates moisture transport. However, there is a concern whether the applied layer system allows maintaining a safe level of moisture content below critical moisture content (CMC), which has been set at 20%. The article presents the annual hygrothermal calculation of the proposed roof slope for four locations of northern Europe and Greenland characterized by costal or subpolar climate. Four scenarios of indoor air relative humidity were considered: free floating, RHmin = 40%RH, RHmin = 50%, RHmin = 60%. In all cases, the minimum indoor temperature was 20 ◦C. The analysis was carried out using WUFI®Plus software. The calculation results showed that the moisture content did not exceed 20% in the CLT layer at any of the described locations. However, for the two coldest climates the assumed level of safety has been exceeded in the roof oriented strand board (OSB) sheathing.
Author Agnieszka Sadłowska-Sałęga (FoEEaLS / DoRC)
Agnieszka Sadłowska-Sałęga,,
- Department of Rural Construction
, Krzysztof Wąs (FoEEaLS / DoRC)
Krzysztof Wąs,,
- Department of Rural Construction
Journal seriesBuildings, ISSN 0007-3725, e-ISSN 2471-3112, (N/A 70 pkt)
Issue year2020
Vol10
No1
Pages1-14
Publication size in sheets0.65
Keywords in EnglishCLT; moisture condensation; critical moisture content; diffusively open; northern coastal climates; hygrothermal calculation
ASJC Classification2205 Civil and Structural Engineering; 2215 Building and Construction; 2216 Architecture
DOIDOI:10.3390/buildings10010010
URL https://www.mdpi.com/2075-5309/10/1/10
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa (CC-BY); after publication
File
buildings-10-00010-v2.pdf 5,68 MB
Score (nominal)70
Score sourcejournalList
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.568
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