Characteristics with the hostel building:
• No organic content in climate shell
• Concrete slabs
• Brick facades, concrete facades
• A heavy building structure
The differences organic and unorganic materials
Organic materials:
• Wood
• Woodbased plates
Unorganic materials:
• Stonebased materials
• Bricks, concrete, cement and lime
plaster
• Mineral wool insulation
Organic materials return to nature through microbiological processes:
• moulding, growth of sponge
• decay, they get rotten
Theses processes need, besides organic material:
• high RH (relative humidity), >80%
• temperature over about +8o (maximum growth at +25o)
Unorganic, stonebased materials return to nature through
• mechanical erosion (above all)
• sometímes chemical processes
Walls with these constructions have no organic content:
Bricks
Mineral wool insulation
Inner wall of concrete,
bricks, AAC, leca etc
Lime or cement plaster
Mineral wool insulation
Inner wall of concrete,
bricks, AAC, leca etc
In walls with organic
content the risk for
moisture and mould
problems increase when
you use thicker insulation
layer
as you do in passive
houses
Therefore the unorganic walls in the hostel are
a quality that one ought to build further on
Other advantages with heavy building structures and
stonebased outer walls:
• The building structure stores up energy from periods
of the day when there is solar radiation or heat from
machines, lamps, people etc to the night, when
otherwise heat must be generated (i.e. energy
savings)
• The storage of energy in the building structure
means more comfort, and less need for cooling
• Plastered inner surface creates airtightness, is
visible for inspection
Wall with unorganic content, concrete foundation, sustainable
desigtn with very good energy performance:
U-value is above all decided by the thickness of the insulation layer
(drawing from my book ”Modern brick details”)
Passive house technique
Technical specifications according to
swedish practice
• Maximum energy demand 45 kWh/m2,
presupposed max 4 W/m2 free heating from
people, machines, electrical equipment etc
• so little heating needed that it can be distributed
through warming of hygienically needed
ventilation air
• Air leakage through climate shell max 0,30
l/s,m2 at 50 Pa pressure
• U-value for windows maximum 0.9
These figures are valid for the south of Sweden.
Last years energy demand in passive house projects lower, i.e. 0.30
kWh/m2
Passive houses in Lindåsen
20 terrace houses without heating system
Passive houses in Lindåsen
Passive houses in Lindåsen
Passive houses in Lindåsen
U-values:
Floors ground floor
0,09
Outer walls
0,10
Roof
0,08
Windows
0,85
Passive houses in Lindåsen
In my book ”Modern brick detailing” I show details for walls with brick facades and
inner leaf wall from different stonematerials:
Window – wall connection
vattenutledande rostfri plåt,
dras ut på ömse sida om
fönsteröppning
tegel
fingerspalt
mineralull
tegel
puts/tunnputs
isolering av cellplast,
bryter köldbryggan,
dilaterar fasad- och
bakmur
smygen putsas
tätning med
bruk
drevning, bottningslist,
lufttätning med bruk
UTE
INNE
This is not a drawing from Lindåsen!
Roof – wall connection
bruksträng i lutning,
vindskyddsfolie dras
framöver bruksträng
tegel
fingerspalt
mineralull
lättklinker
puts
takåsen förankras i hammarbandet,
plastfolie/ångbroms ansluts lufttätt mot
murkrönet
hammarband förankras c600 med
expander, på uk sätts gummipackning,
plastfolie kläms mellan gummipackning
och mur, ök mur jämnas av med bruk
This is not a drawing from Lindåsen!
U-value in hostel walls after rebuilding, influence from
insulation thickness
mm mineral wool
(insulation)
Important factors regarding energy consumption in houses
(from my point-of-view)
• Low U-value in climate shell
min. wool (insulation):
Under floors (without cellar):
200 mm)
Roof:
400-500
Walls:
200-300
Windows
U-value 0,9-1,0
• Minimize windows on north facade
• Airtightness important, air leakage 0.3 l/s, m2 maximum allowed in
passive houses
• Minimize influence from heat bridges
• Recycling of heat content in ventilation air
