European strawbale building methods 1. General information Method of construction: Representative: Contact:
Post and Beam (wrap
ID: PB-‐02
Boris Hochel borho44@gmail.com www.ozartur.sk
Personal quotation First SB method with official building permition in Slovakia in 2006.
Table of Content 1. General information 2. Visual description of the method-‐1 3. Visual description of the method -‐2 4. Technical drawings 2D 5. Explanation of the method 6. Calculation sheet 7. Questionnaire 8. Sustainability 9. Evaluation sheet
Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE
European strawbale building methods 2. Visual description of the method-‐1
Evaluation of best building practices 3D – 1
Method of construction: Representative: Contact:
Post and Beam (wrap
ID: PB-‐02
Boris Hochel borho44@gmail.com www.ozartur.sk
view from exterior
wraping with strawbales from exterior
Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE
European strawbale building methods 3. Visual description of the method -‐2 3D – 2
Method of construction: Representative: Contact:
Post and Beam (wrap
ID: PB-‐02
Boris Hochel borho44@gmail.com
view from outside
view from inside
Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE
European strawbale building methods 4. Technical drawings 2D Method of construction: Representative: Contact:
Evaluation of best building practices Post and Beam (wrap ID: PB-‐02 Boris Hochel borho44@gmail.com
without scale
Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE
European strawbale building methods 5. Explanation of the method Method of construction: Representative: Contact:
Evaluation of best building practices
Post and Beam (wrap
ID: PB-‐02
Boris Hochel borho44@gmail.com
Stone foundations
Post and beam construction including roof and floor
Wraping strawbales arround the house with a help of boards
Plastering strawbales with clay from exterior
Interior with painted earth plaster
General overview of the house
Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE
European strawbale building methods 7. Questionnaire Method of construction: Representative: Contact:
1
Post and Beam (wrap
ID: PB-‐02
Boris Hochel borho44@gmail.com
Fixation of bales How are your bales secured in the wall?
2
Wooden boards push the bale against the wall fixed with hook and rope. Hazel pins are also used to fix the bales
Bales without gaps
How do you ensure tightness of the strawbale wall insulation (stuffing gaps between bales with loose straw for example)?
3
Stuffing the gabs with loose straw
Moisture
3.1 How do you deal with potential of rain bouncing from the ground surface and ground humidity? Bottom of the first row of bales is lifted minimum 45 cm above the ground
3.2 How do you deal with possibility of water intrusion from building’s interior at each floor level? Irrelevant
3.3 How do you protect straw in your walls against wind driven rain? With 2 layers of clay plaster and finishing layer of lime plaster
3.4 How do you protect your wall during it’s construction from weather? First we built the wooden structure infilled with bricks and the roof. The walls are then wrapped ith strawbales from outside
3.5 How do you prevend water leakage at the window sill detail? The window sill is made of tin with splayed drip on the edge
4
Bales What are your criteria of bale quality (shape, density, moisture content…)? Give the borderline values. Humidity < 15% / density 130 kg/m3 / bales : 500/400/800mm
Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE
European strawbale building methods 7. Questionnaire Method of construction: Representative: Contact:
5
Post and Beam (wrap
ID: PB-‐02
Boris Hochel borho44@gmail.com
Wall coating 5.1 Plaster How do you ensure bond of the plaster/render (if included in your wall’s assembly) with the straw? 3 layers of render
How do you ensure that your plaster/render (if included in your wall’s assembly) doesn’t crack over connection of two different supporting materials (for example timber-‐straw connection)? Jute mash overlapping at least 200mm over to each side
6 Airtightness What do you do to secure airtightness of the walls? Wall to ceiling, opening or ground floor. Is there a blowerdoor test? Fixing all the gaps, in the floor is breathable foil under the bales
7 Fire resistance
How do you protect the walls from fire, while building and after? Do you refer to official approvals? Yes
Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE
European strawbale building methods 8. Sustainability Method of construction: Representative: Contact:
Post and Beam (wrap
ID: PB-‐02
Boris Hochel borho44@gmail.com
Primary energy demand non renewable (PED) for construction and total transmission heat loss after 50 years THL [kWh/m2] 587
THL fp=0,6 [kWh/m2] 352 PED [kWh/m2] 88
CO2-‐ Balance for construction
CO2-‐ Balance [kg CO2 eq./m2] -‐68
U-‐ Value and acidification potential U-‐ Value [W/m2K] 0.149 Acidification [kg SO2 eq./m2] 0.139
Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE