European strawbale building methods 1. General information
Method of construction: Representative: Contact:
Loadbearing
Evaluation of best building practices
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
Personal quotation load bearing is great, great, and great. Isn't it ?
Tabel 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
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: Representative: Contact:
2-Visual 3D
Loadbearing
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
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: Representative: Contact:
3-Visual 3D_2
Loadbearing
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
Date: 27/05/2011
Page 3
European strawbale building methods 4. Technical drawings 2D
Evaluation of best building practices
Representative: amazonails, Bee Rowen
Method of construction:
Hope Mill, Crescent St, Todmorden OL14 5HA, UK
Loadbearing
ID: LB-01
Contact: +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
!!!! Without scale !!!! 4- Visual 2D_2
Date: 27/05/2011
Page 4
European strawbale building methods 5. Explanation of the method Method of construction: Representative: Contact:
Evaluation of best building practices
Loadbearing
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
I. Building ground floor, first floor and roof structure on the ground
II. Wall raising under roof cover - ground floor level
II. Wall raising under roof cover - first floor level
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:
Loadbearing
Representative: Contact:
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
Material amounts per choosen wall area of: Total wall area Total wall volume Strawbales Wood Laminated timber Regular timber Metal parts
22.397 8.063 8.063 0.570
m² Wall length m³ m³ m³ m³ 0.570 m³ kg/m2
m 4.140 Wall height Wall thickness
m 5.410 m 0.360 m
Costs of material and labour
Calculated in subject to the conditions of the producing country 182.62 €/m2 Labour Material Labour Total costs/ input/ costs/sqm costs/ sqm sqm
Total
Straw bales, everything included Wood: Posts and beams, [1] boards, everything included
h
15.75
26.33
42.08 €/m2
h
15.68
34.57
50.26 €/m2
Outside complete: Limeplaster
h
44.67 €/m2
Inside complete: Clayplaster
h
45.63 €/m2
Costs of material and labour
200.00 180.00 160.00
45.63
EUR/m²
140.00
Inside complete: Clayplaster
120.00 100.00
44.67 Outside complete: Limeplaster
80.00 50.26
60.00 34.57
40.00 20.00 0.00
15.68 15.75
26.33
42.08
Wood: Posts and beams, boards, everything included Straw bales, everything included
Material costs/sqmLabour costs/ sqm Total costs/ sqm Costs without painting per sqm
[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: Representative: Contact:
1
Loadbearing
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
Fixation of bales 1.1 How are your bales secured in the wall? Loadbearing walls = compression + hazel stubs in baseplate and wallplate +
2
roofplate pinned by hazel pins
Bales without gaps
2.1 How do you ensure tightness of the strawbale wall insulation (stuffing gaps between bales with loose straw for example)? Stuffing all the gaps with loose straw + vertical and horizontal
3
compression of loadbearing system
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 above the ground at least 350mm.
3.2 How do you deal with possibility of water intrusion from building’s interior at each floor level? Bottom of the first row of bales at each floor level is lifted above the floor at least 30mm by draining baseplate
3.3 How do you protect straw in your walls against wind driven rain? External protection (trees – natural wind breaks) wherever possible. Extremely exposed walls are always timber clad. Less exposed walls are limeplastered with Beeck external paint finish.
3.4 How do you protect your wall during it’s construction from weather? Amazonails system allows for wallrizing under finished roof (see appendix B). Horizontal rain is sheltered by scaffolding wrapped in tarps, which is built along the whole perimeter of the building.
3.5 How do you prevend water leakage at the window sill detail? Window frame includes timber corner protections “ears” to each side of
4
the sill and double window sill has drip edge.
Bales
4.1 What are your criteria of bale quality (shape, density, moisture content…)? Give the borderline values. Ideally 450x350x1050mm bales baled by MF 130 baling machine. Density = 120kg/m3. MC < 16% dry basis, 18% wet basis
7- Questionnaire
Date: 27/05/2011
Page 7
European strawbale building methods 7. Questionnaire Method of construction: Representative: Contact:
5
Evaluation of best building practices
Loadbearing
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
Wall coating with plaster or boards 5.1 How do you ensure bond of the plaster/render (if included in your wall’s assembly) with the straw? First layer of lime plaster/render is pushed into straw by hand.
5.2 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)? Hessian overlapping the joint at least 300mm over to each side
5.3 In case of unsing Boards, etc. What is important for you?
6 Airtightness 6.1 What do you do to secure airtightness of the walls? Wall to ceiling, opening or ground floor. Is there a blowerdoor test? Timber is notched into strawbales
7 Fire resistance 7.1 How do you protect the walls from fire, while building and after? Do you refer to official approvals? 25mm thick lime plaster on the inside + 25mm thick lime render on the outside
7- Questionnaire
Date: 27/05/2011
Page 8
European strawbale building methods 8. Sustainability
Evaluation of best building practices
Method of construction: Representative: Contact:
Loadbearing
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk
Primary energy demand non renewable (PED) for construction and total transmission heat loss after 50 years THL [kWh/m2] 674 THL fp=0,6 [kWh/m2] 404 PED [kWh/m2] 81
CO2- Balance for construction
CO2- Balance [kg CO2 eq./m2] -94
U- Value and acidification potential
U- Value [W/m2K] 0.171 Acidification [kg SO2 eq./m2] 0.153
8- Sustainability
Date: 27/05/2011
Page 9
European strawbale building methods 9. Evaluation sheet Method of construction: Representative: Contact:
Evaluation of best building practices
Loadbearing
ID: LB-01
amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK +44 845 458 2173, bee@amazonails.org.uk www.amazonails.org.uk Assessment value
Present
Validation
8.87
≥ REI 30
?
o
[1], [2], [3]
?
o
≥ 44
?
o
n50 < 1,5 (air change at 50pa)
?
o
< 15 h/m² (too less!?) < 125 EUR/m² <125 EUR/m² <250 EUR/m²
5.00 60.90 31.43 182.62
> 60 < 100
68.73 41.76
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]
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 Fixation of bales Handling/ installing of bales Protection to moisture/ water bouncing from ground intrusion from interior floors etc. during construction at wall openings Bale quality [Quality Assurance] Cladding Plaster Boards/ other [1] visual examination of installed straw after years. [2] Microbiological investigation in laboratory of installed straw [3] General approval for mould absence
9- Evaluation Sheet
Date: 27/05/2011
Page 10
General Wall length Wall height Total wall area Wall thickness Total wall volume 1 Strawbales
4.000 4.485 17.940 0.450 8.073
m m m² m m³
8.073 m³
2 Wood posts profile Volume of posts beams profile Volume of beams bracings profile Volume of bracings Total length of above Total volume of above
8.970 0.010 0.090 32.000 0.015 0.480 0.000
m m² m³ m m² m³ m m² 0.000 m³ 40.970 0.570
3 Boards roofplate, wallplate - smartply 18mm length width Area 3 Metal parts Screws normal quality [m] smaller ones (< 5x120mm) larger ones Screws (special ones or stainless steal) [m] smaller ones (< 5x120mm) larger ones Nails [kg] smaller ones (< 120mm) larger ones Other metal parts pieces or overall
16.000 0.460 7.360
1.00 m 2.00 m 0.00 m 0.00 m
2.00 kg 0.00 kg
4 Plaster reinforcements fiberglass mesh jute/ hessian/ hemp …
m² 0.00 m² 7.20 m2
5 Reed (Base for plaster over timber parts) others [which one]
2.40 m²
6 Total workload
5h