Characteristics with the hostel building

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