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Pro erties
PaulBaker&ChrisSanders
SchoolofEngineering&Built
EnvironmentGCU
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Internalsurfacesofroomsandfurnishings
ma
havea
ositiveeffect
to
moderate
the
variationsofindoorhumidityseeninoccupied
.
Theabilityofamaterialtoabsorbandrelease
moisturemaybedefinedasitsMoisture
BufferingCapacity.
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NORDTEST ave e ine t eMoistureBu er
Valueand
test
procedures
in
Moisture
Buffering
o u ng a er a s, epor ,Denmark,2005.
This
value
is
not
afundamental
material
property.
Itcanbeusefulforcomparisonofmaterialsorevenrooms.
Howeverfor
the
Laundr
ro ect
amore
fundamentalapproachisrequiredtocomplementmodellingactivities.
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Thepropertieswhichcontributetomoisture
bufferin
are:
Vapourpermeability
.
GCUhascarriedout:
Areviewofdatabasesofmaterialproperties
materialswhicharenotavailable,e.g.clayboard
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DiffusionResistanceFactor i.e.
morevapouropenorbreathable
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Itisimportanttonotethatboththe
ermeabilit
andthe
absor tion
are
stead
stateproperties
toreachequilibriumandtestsarecarriedout
withallsurfacesexposed notehigh
absorptionof
Laminate
Flooring
=MDF).
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Possibleoperating
range
of
surface
finishes
50
90%RH?
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Theclayboard,linoandunsealedcorkappear
tohave
more
otential
than
lasterboard
in
termsofmoistureabsorption,butwithsimilar
Thereforebettermoisturebufferers?
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s ngappara us
originally
designed
for
testingofmembraneswehavedevelo eda
prototypeprocedure
fortestingthemo s ure u er ngomaterialstoprovide
validation.
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Steady23oC&50%RHtoachieveequilibrium
Allowsampletoreturntoequilibriumat
50 RH Measurechan ein wei htofsam le
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ClayBoardsampleMoisture
Moisture
Released
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Examineeffectoffrequentcyclesofincreased
RH e. .
dail
or
twice
dail .
Comparativetests(6samplesmaybetested
.
Modelling(ESRU) aresteadystate
absorption(+desorption)propertiesand
ermeabilit enou h to describe moisture
bufferingeffects?
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ThankYou
