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European strawbale building methods Best building practice
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European strawbale building methods
1. General information Evaluation of best building practices
Method of construction: Post and Beam ID: PB-01
Representative: Peter Vos, Belgium
Contact: architectengroep barchi bvba, Tikkelsteeg 11 3770 Riemst
Tel +32 12 / 39 50 28, info@barchi.be, www.barchi.be
Personal quotation
....we built with this method already 10 years...
Table of Content
7. Questionnaire
9. Evaluation sheet
2. Visual description of the method-1
1. General information
3. Visual description of the method -2
4. Technical drawings 2D
5. Explanation of the method
6. Calculation sheet
1- General Date: 27/05/2011 Page 1
European strawbale building methods
2. Visual description of the method-1 Evaluation of best building practices
3D – 1
Method of construction: Post and Beam ID: PB-01
Representative: Peter Vos, Belgium
Contact: architectengroep barchi bvba, Tikkelsteeg 11 3770 Riemst
Tel +32 12 / 39 50 28, info@barchi.be, www.barchi.be
2-Visual 3D Date: 27/05/2011 Page 22-Visual 3D Date: 27/05/2011 Page 2
European strawbale building methods
3. Visual description of the method -2 Evaluation of best building practices
3D – 2
Method of construction: Post and Beam ID: PB-01
Representative: Peter Vos, Belgium
Contact: architectengroep barchi bvba, Tikkelsteeg 11 3770 Riemst
Tel +32 12 / 39 50 28, info@barchi.be, www.barchi.be
3-Visual 3D_2 Date: 27/05/2011 Page 33-Visual 3D_2 Date: 27/05/2011 Page 3
European strawbale building methods
4. Technical drawings 2D Evaluation of best building practices
Method of construction: Post and Beam ID: PB-01
Representative: Peter Vos, Belgium
Contact: architectengroep barchi bvba, Tikkelsteeg 11 3770 Riemst
Tel +32 12 / 39 50 28, info@barchi.be, www.barchi.be
4- Visual 2D_2 Date: 27/05/2011 Page 4
!!!!without scale!!!!
4- Visual 2D_2 Date: 27/05/2011 Page 4
European strawbale building methods
5. Explanation of the method Evaluation of best building practices
Method of construction: Post and Beam ID: PB-01
Representative: Peter Vos, Belgium
Contact: architectengroep barchi bvba, Tikkelsteeg 11 3770 Riemst
Tel +32 12 / 39 50 28, info@barchi.be, www.barchi.be
Concrete foundations Post and beam construction
including roof and floors
5- Explanation of the method Date: 27/05/2011 Page 5
Compressing strawbales
between the vertical posts
Exterior lime plaster by
machine directly on the
strawbales
Interior earth plaster directly on
the strawbales
Preparation of plastering Covering of wooden
parts with reed at the outside and jute mesh
inside
5- Explanation of the method Date: 27/05/2011 Page 5
European strawbale building methods
6. Calculation sheet Evaluation of best building practices
Method of construction: Post and Beam ID: PB-01
Representative: Peter Vos, Belgium
Contact: architectengroep barchi bvba, Tikkelsteeg 11 3770 Riemst
Tel +32 12 / 39 50 28, info@barchi.be, www.barchi.be
Material amounts per choosen wall area of: m m
Total wall area 21.378 m² Wall length 4.200 Wall height 5.090 m
Total wall volume 7.696 m³ Wall thickness 0.360 m
Strawbales 7.696 m³
Wood 0.931 m³
Laminated timber 0.366 m³
Regular timber 0.564 m³
Metal parts kg/m2
Costs of material and labour Calculated in subject to the conditions of the producing country
Total 184.47 €/m2
Labour
input/
wall area
Material
costs/wall
area
Labour costs/
wall area
Total costs/
wall area
Straw bales, everything
included 0.400 h 11 14 25 €/m2
6- Calculations Date: 27/05/2011 Page 6
included 0.400 h 11 14 25 €/m2
Wood: Posts and beams,
everything included 9.000 h 24 14 38 €/m2
Outside complete: Limeplaster 1.486 h 30 52 82 €/m2
Inside complete: Clayplaster 1.143 h 0 40 40 €/m2
[1] Material costs for metal parts and screws etc. included in Labour costs
[2] Material costs for metal parts and screws etc. included in material costs
11 14 2524 14
3830 52
82
0
40
40
0
50
100
150
200
Material costs/wall
area
Labour costs/ wall
area
Total costs/ wall
area
EU
R/m
²
Costs of material and labour
Inside complete: Clayplaster
Outside complete: Limeplaster
Wood: Posts and beams, everything
included
Straw bales, everything included
6- Calculations Date: 27/05/2011 Page 6
European strawbale building methods
7. Questionnaire Evaluation of best building practices
Method of construction: Post and Beam ID: PB-01
Representative: Peter Vos, Belgium
Contact: architectengroep barchi bvba, Tikkelsteeg 11 3770 Riemst
Tel +32 12 / 39 50 28, info@barchi.be, www.barchi.be
1
2
3Stuffing the gabs with loose straw
Bales without gaps
Moisture
How do you ensure tightness of the strawbale wall insulation (stuffing
gaps between bales with loose straw for example)?
Fixation of balesHow are your bales secured in the wall?
Vertical and horizontal compression of the bales with post and beams. Hazel
pins to fix the bales
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 15 cm above the ground
3.3 How do you protect straw in your walls against wind driven rain?
3.2 How do you deal with possibility of water intrusion from building’s
interior at each floor level?
Irrelevant
4 Bales
First we build the wooden structure with the roof. Before infilling het
construction with bales, we protect the whole construction from the outside.
The bales are placed from inside
3.5 How do you prevend water leakage at the window sill detail?
What are your criteria of bale quality (shape, density, moisture
content…)? Give the borderline values.
Humidity < 15% / density 90-120 kg/m3 / bales : 450/350/900mm
With 3 layers of trasskalk
3.3 How do you protect straw in your walls against wind driven rain?
3.4 How do you protect your wall during it’s construction from weather?
7- Questionnaire Date: 27/05/2011 Page 7
European strawbale building methods
7. Questionnaire Evaluation of best building practices
Method of construction: Post and Beam ID: PB-01
Representative: Peter Vos, Belgium
Contact: architectengroep barchi bvba, Tikkelsteeg 11 3770 Riemst
Tel +32 12 / 39 50 28, info@barchi.be, www.barchi.be
5
6
7
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, blower door test is planed in future Fire resistance
Wall coating
How do you ensure bond of the plaster/render (if included in your wall’s
assembly) with the straw?
5.1 Plaster
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)?
Bamboonets overlapping at least 200mm over to each side
Boards, others
Airtightness
3 layers of limeplaster with net
7 Fire resistance
How do you protect the walls from fire, while building and after? Do you
refer to official approvals?
Yes
7- Questionnaire Date: 27/05/2011 Page 8
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