European strawbale building methods 1. General information
Method of construction: Architect Representative: Contact: Builders Representative: Contact:
REGLES PRO
Evaluation of best building practices
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr
Personal quotation In France, only infill straw bales in a bracing wooden frame structure can lead professionals to build legally. So we decided to prefabricate the building, which brings a high comfort of work and a protection against bad weather, building is very fast, and the straw is completely protected. Human being is not forgotten in our companies, very big industrialized machine are not use. Finally we privilege the local actors for all our supplies.
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. Evaluation 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: Architect Representative: Contact: Builders Representative: Contact:
2-Visual 3D
REGLES PRO
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr
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: Architect Representative: Contact: Builders Representative: Contact:
3-Visual 3D_2
REGLES PRO
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr
Date: 27/05/2011
Page 3
European strawbale building methods 4. Technical drawings 2D Method of construction: Architect Representative: Contact: Builders Representative: Contact:
Evaluation of best building practices
REGLES PRO
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr
!!!!without scale!!!! 4- Visual 2D_2
Date: 27/05/2011
Page 4
European strawbale building methods 5. Explanation of the method Method of construction: Architect Representative: Contact: Builders Representative: Contact:
Evaluation of best building practices
REGLES PRO
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr
Wooden frame structure construction
the builders workshop
and implementation of the air barrier
stone fondations
first days, carrying the wall
fourth days,
end of the Dojo
implémentation of the insulated roof
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:
REGLES PRO
Architect Representative: Contact: Builders Representative: Contact:
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr
Material amounts per choosen wall area of: Total wall area Total wall volume Strawbales Wood
22.680 10.886 10.886 1.420
m² m³ m³ m³
m Wall length 4.200
Wall height Wall thickness
m 5.400 m 0.480 m
Metal parts
kg/m2
Costs of material and labour
Calculated in subject to the conditions of the producing country 236.30 €/m2 Material Labour costs/ Total costs/ costs/wall wall area wall area area h 12 69 81 €/m2
Total
workshop prefab lifting on building site OUTSIDE : cladding skirting
Labour input/ wall1.980 area
0.520 h 1.486 h 1.800 h
0 40 0
0 52 63
0 €/m2 92 €/m2 63 €/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
6- Calculations
Date: 27/05/2011
Page 6
European strawbale building methods 7. Questionnaire
Evaluation of best building practices
Method of construction:
REGLES PRO
Architect Representative: Contact: Builders Representative: Contact:
1
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr
Fixation of bales How are your bales secured in the wall? compressed between the posts
2
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 25 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? cladding
3.4 How do you protect your wall during it’s construction from weather? All the walls and roof are build in prefab, few days are enough to implement all. The bales are protected by boards.
3.5 How do you prevend water leakage at the window sill detail? The sill plate is risen on the both sides.
4
Bales 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
7- Questionnaire
Date: 27/05/2011
Page 7
European strawbale building methods 7. Questionnaire
Evaluation of best building practices
Method of construction:
REGLES PRO
Architect Representative: Contact: Builders Representative: Contact:
5
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr
Wall coating 5.1 Plaster How do you ensure bond of the plaster/render (if included in your wall’s assembly) with the straw? reeds
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)? the reeds are fixed on batten
Boards, others
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 and thanks air tightness layer.
7 Fire resistance
How do you protect the walls from fire, while building and after? Do you refer to official approvals? Boards, we refer to official approvals.
7- Questionnaire
Date: 27/05/2011
Page 8
European strawbale building methods 8. Evaluation sheet Method of construction: Architect Representative: Contact: Builders Representative: Contact:
Evaluation of best building practices
REGLES PRO
ID: RP
Architecture BOHA Cédric Hamelin / Catherine Bouffière boha@graffizone.com BATINATURE Mathieu Junique et Maël Steck mathieu.junique@bati-nature.fr Assessment value
Present method
Validation
7.29
boards
Technical properties Thermal behaviour Thermal resistance R [K·m²/W] Fire behaviour Fire resistance Moisture behaviour Approved absence of mould Sound insulation Rw [dB] Airtightness Blowerdoortest passed
≥ 5,7
[at λ=0,051]
≥ REI 30 [1], [2], [3] ≥ 44
breazing walls
not examined yet 0.50
< 15 < 125 <125 <250 EUR/m²
5.79 184.30 52.00 236.30
> 60 < 100
61.14 61.21
n50 < 1,5 (air change at 50pa)
Costs/ Effort Labour input [h/m²] Labor costs [ EUR/m²] Material costs [ EUR/m²] Total costs [EUR/m2]
Sustainability CO2-Storage [Kg/m²] PED nre [kWh/m²] Wood usage [kg(m²] Metal usage [kg/m²]
Professional execution ingineering made by Batinature wood calculation wood assemblies in workshop straw work in workshop breazing layer in workshop carrying walls assemblies in site tightness with water tightness with air Blowerdoortest passed finishing [1] visual examination of installed straw after years. [2] Microbiological investigation in laboratory of installed straw [3] General approval for mould absence 8- Evaluation Sheet
Date: 27/05/2011
Page 9
22.68 m²
All prices without taxes, calculated of the defined wall area of: Material Work
Heures Total Mat/sqm Amount Unit /m² Salary EUR h EUR/m³ 1 179.30 € 52.00 € 5.786
Amount Unit Price/Amount Totals
Price/Unit Total Work/sqm Mat+Work/sqm EUR EUR EUR 35 4 179.92 € 184.30 € 236.30 €
1 workshop prefab 9.07
69.30 €
81.30 €
0.00 €
0.00 €
0.00 €
52.00 € 1 179.36 € 63.00 € 1 428.84 €
52.00 € 63.00 €
92.00 € 63.00 €
m³
30
272.10 €
12.00 €
22.68
m²
1.98
35
69.30 € 1 571.72 €
m³
550
0.00 €
0.00 €
0
m³
0.52
35
18.20 €
m² m²
40 0
907.20 € 0.00 €
40.00 € 0.00 €
22.68 22.68
m² m²
1.486 1.8
35 35
2 lifting on building site 3 OUTSIDE : cladding 4 skirting
22.68 22.68
General lengh of the wall high of the wall surface of the wall thickness of the wall volume of the wall
4.200 5.400 22.680 0.480 10.886
m m m² m m³
1 STRAW BALES
9.070 m³
2 WOOD wooden frame
0.980 m3
wooden bracing surface Volume of wood
18.000 m² 0.160 m³
batten skirting
0.09 m3 0.22 m3
surface Volume
5.14 m² 0.06 m3
TOTAL VOLUME OF WOOD
1.42 m3
parement intérieure
3 WOOD FIBER BOARDS
TOTAL