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Surface treatment of wood in hospital buildings
Nordic seminar on the health effects of wood
November 28, 2018Christiania Quartalet Meeting Center, Oslo
Ulrich Hundhausen
Environmental aspects?
COMPOSITESolid VENEER CHIP FIBER
MDFParticle-board
OSB
Tublar board
LVL
Plywood
ParallamCLT
GlulamInsulation-board
HDF
Honeycomb plate
Blockboard
WPC 50-80%>84%95-97%
90-95%
86-93% 84-90%
95-97%
95-97%
Estetics (psychological effects)?
Dekorative paperHDFBase layer
(Impact-sound red. layer)
Coating (laquer, hard wax oil)
Wear layer (solid wood)Core (plywood, strips)
Base layer
Coating (melamine)
PARQUETLAMINATE
MDF Solid wood
Indoor air quality?
H2Oliquid
H2Ovapor
H2Oliquid
H2Ovapor
H2Ovapor
H2Oliquid
No coating Non film-forming coating Film-forming coating
Moisture Buffer Value (∆m/S ∆RH)
Hameury S et al. (2007): Influence of coating system on the moisture buffering capacity of panels of Pinus sylvestris L., Wood Mater Sci Eng (2:3-4), 97-105
Moisture buffer value
Hameury S et al. (2007): Influence of coating system on the moisture buffering capacity of panels of Pinus sylvestris L., Wood Mater Sci Eng (2:3-4), 97-105
After 8 h in 22°C/ 75%RH
After 16 h in 22°C/ 25%RH
After 8 h in 22°C/ 75%RH
After 16 h in 22°C/ 25%RH
Requirements in health buildings
• Most areas are highly frequented
A-hus barselhotellet
Ullevål sykehusFoto: Stein BjørgeAftenposten
Recommended properties of floors related to their application field in hospitalsAb
rasio
n
Inde
ntat
ion
resis
tanc
eCh
emica
l res
istan
ceW
alki
ng co
mfo
rtW
arm
com
fort
Slip
pery
resis
tanc
eCh
air c
asto
r res
istan
ceW
ater
tigh
tnes
sW
ater
resis
tanc
eSt
aini
ng re
sista
nce
Clea
nabi
lity
Repa
irabi
lity
Bath room 4 4 G5 1-4 4 5 5 5 5 5
Desinfection room 4 4 H5 1-3 4 5 5 5 5
Laboratory 4 4 1-3 5 5 5 5 5
Ward 4 4 4 4 4 5 5 3
Corridor 4 4 4 5 4-5
Operating room 4 4 5 5
Nivå Byggdetaljer 541.002 and EN 685
5 Must have best properties
4 Must have good properties
3 Must have normal properties
2 Must fulfil low requirements
1 Limited suitablility
Wet coatingsLime, chalk and soap
Oil,oil/wax,hard wax oil
Lacquer and paintResistance/
maintenance-interval
Vapordiffusion
Water vapour diffusionMulti-layer parquet
Grüll G et al. (2012): Diffusion properties of oil/wax systems on industrially finished wood floorings, Holztechnologie (53), 31-34
Uncoated
Water vapour diffusionMulti-layer parquet
Grüll G et al. (2012): Diffusion properties of oil/wax systems on industrially finished wood floorings, Holztechnologie (53), 31-34
Beech
Lacquer vs. hardwax oilProperty Lacquer Hardwax oil
Resistance Very high Moderate
Appearance Very reflective More natural
Cracking/bursting Possible Not possible
Reparabiltiy Whole floor must be sanded Easy to patch repair
Fire safety• Health buildings have highest risk class (TEK 17)
=> strong requirements to fire safety=> use of flame retardants
Summary• Specific coatings for specific areas and components
• Lime/chalk/soap• Almost no protection => ceiling, (paneling)• Tendency to yellowing• Recommended to use white-pigmented oils
• Oil/wax• Little protection => paneling, ceiling
• Hardwax• Good protection, easy repair => floor
• Lacquer/paint• High protection, difficult repair => floor
Resistance/maintenance-
interval
Vapordiffusion
Research needs
• Better documentation on the water vapor diffusion of different coatings
• Development of coatings with high water vapor diffusion and resistance
• Design guidelines for wood products and their surface treatments for health buildings and other public buildings
Thank you very much for your
attention!