Moisture Buffer Value of Building Materials

Abstract

Moisture Buffer Value of Building MaterialsRode, C.; Peuhkuri, R.; Hansen, K.K.; Time, B.; Svennberg, Kaisa; Arfvidsson, Jesper; Ojanen, T. Published: 2006-01-01 Link to publication Citation for published version (APA): Rode, C., Peuhkuri, R., Hansen, K. K., Time, B., Svennberg, K., Arfvidsson, J., & Ojanen, T. (2006). Moisture Buffer Value of Building Materials. Paper presented at ASTM Symposium on Heat-Air-Moisture Transport: Measurements on Building Materials, Toronto, Canada.General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Moisture Buffer Value of Materials in Buildings

Qualitative and quantitative assessment of interior moisture buffering by enclosures

“…Qualitative assessment of interior moisture buffering requires a dependable, single-valued characterisation of the moisture buffer potential (MBP) of room enclosures, allowing comparison of different enclosure designs. Recently various protocols to characterise the MBP of single elements have been suggested [19][20][21][22] and their possible superposition to the enclosure level has been proposed as well [23]. This paper demonstrates though that only one of these single-element MBP protocols shows potential.…”

“…The moisture effusivity was suggested as "theoretical description" of the singleelement MBP by Rode et al [19]. Delgado et al [20] advocate the use of sorption kinetics: the moisture accumulation in a sample of the element due to a single step-change in ambient relative humidity (RH) is curve-fitted with a predefined formula, involving an equivalent element storage and transport parameter.…”

“…Delgado et al [20] advocate the use of sorption kinetics: the moisture accumulation in a sample of the element due to a single step-change in ambient relative humidity (RH) is curve-fitted with a predefined formula, involving an equivalent element storage and transport parameter. Japanese Industrial Standard A 1470-1 [21], Draft International Standard 24353 [22], and the Nordtest Moisture Buffer Value protocol [19] propose using the amplitude of the moisture accumulation in a element sample exposed to cyclic step changes in ambient RH. While the standard moisture capacity and moisture permeability allow calculation of the hygric response of materials, they are as such not a valid single-element MBP characterisation.…”

“…The double description with a storage and transport parameter gives issues similar to the moisture capacity and permeability though: the direct comparison of different elements is difficult. Most attention has hence gone to MBP characterisations from cyclic step-change (de)-sorption measurements [19,21,22]. The sample of the element is conditioned to a specific RH, and sealed at all but its normally exposed sides.…”

“…Figure 2 implies though that these practical moisture production intervals may vary: from one hour for the bathroom, over four-to-five hour for the living room and kitchen, up to eight hour for the bedroom. This variation is not recognised by any of the cyclic step-change (de)sorption measurement protocols [19,21,22] and their enhancement is required .…”