bbp amazonails

European strawbale building methods

1. General information Evaluation of best building practices

Method of construction: Loadbearing ID: LB-01

Representative: amazonails, Bee Rowen

Contact: Hope Mill, Crescent St, Todmorden OL14 5HA, UK

+44 845 458 2173, [email protected] www.amazonails.org.uk

Tabel of Content1. 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

Personal quotation

load bearing is great, great, and great. Isn't it ?

1- General Date: 27/05/2011 Page 1


2. Visual description of the method-1 Evaluation of best building practices

3D – 1





2-Visual 3D Date: 27/05/2011 Page 2


3. Visual description of the method -2 Evaluation of best building practices

3D – 2





3-Visual 3D_2 Date: 27/05/2011 Page 3


4. Technical drawings 2D Evaluation of best building practices

Representative: amazonails, Bee Rowen Hope Mill, Crescent St, Todmorden OL14 5HA, UK


Contact: +44 845 458 2173, [email protected] www.amazonails.org.uk

!!!! Without scale !!!!

4- Visual 2D_2 Date: 27/05/2011 Page 4


5. Explanation of the method Evaluation of best building practices





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


6. Calculation sheet Evaluation of best building practices





Material amounts per choosen wall area of: m m

Total wall area 22.397 m² Wall length 4.140 Wall height 5.410 m

Total wall volume 8.063 m³ Wall thickness 0.360 m

Strawbales 8.063 m³

Wood 0.570 m³

Laminated timber m³

Regular timber 0.570 m³

Metal parts kg/m2

Costs of material and labour Calculated in subject to the conditions of the producing country

Total 182.62 €/m2

Labour

input/

Material

costs/sqm

Labour

costs/ sqm

Total costs/

sqm

Straw bales, everything

included h 15.75 26.33 42.08 €/m2

[1]Wood: Posts and beams,

boards, everything included h 15.68 34.57 50.26 €/m2

Outside complete: Limeplaster h 44.67 €/m2

Inside complete: Clayplaster h 45.63 €/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

15.75 26.3342.0815.68

34.57

50.26

44.67

45.63

0.00

20.00

40.00

60.00

80.00

100.00

120.00

140.00

160.00

180.00

200.00

Material costs/sqmLabour costs/ sqm Total costs/ sqm

EU

R/m

²

Costs without painting per sqm

Costs of material and labour

Inside complete: Clayplaster

Outside complete: Limeplaster

Wood: Posts and beams, boards,

everything included

Straw bales, everything included

6- Calculations Date: 27/05/2011 Page 6


7. Questionnaire Evaluation of best building practices





1

2

3

4

Ideally 450x350x1050mm bales baled by MF 130 baling machine. Density

= 120kg/m3. MC < 16% dry basis, 18% wet basis

Bottom of the first row of bales at each floor level is lifted above the

floor at least 30mm by draining baseplate

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.

Fixation of bales

Bales

Stuffing all the gaps with loose straw + vertical and horizontal

compression of loadbearing system

1.1 How are your bales secured in the wall?

Loadbearing walls = compression + hazel stubs in baseplate and wallplate +

roofplate pinned by hazel pins

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?

3.4 How do you protect your wall during it’s construction from

weather?

4.1 What are your criteria of bale quality (shape, density, moisture

content…)? Give the borderline values.

Window frame includes timber corner protections “ears” to each side of

the sill and double window sill has drip edge.

3.3 How do you protect straw in your walls against wind driven rain?

Bales without gaps

Moisture

2.1 How do you ensure tightness of the strawbale wall insulation

(stuffing gaps between bales with loose straw for example)?

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?

7- Questionnaire Date: 27/05/2011 Page 7


7. Questionnaire Evaluation of best building practices





5

6

7

Hessian overlapping the joint at least 300mm over to each side

5.3 In case of unsing Boards, etc. What is important for you?

Airtightness

Wall coating with plaster or boards

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)?

5.1 How do you ensure bond of the plaster/render (if included in your

wall’s assembly) with the straw?

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

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


8. Sustainability Evaluation of best building practices





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


9. Evaluation sheet Evaluation of best building practices





Assessment value Present Validation

Technical propertiesThermal behaviour

Thermal resistance R [K·m²/W] ≥ 5,7 [at λ=0,051] 8.87 ��

Fire behaviour

Fire resistance ≥ REI 30 ? o

Moisture behaviour

Approved absence of mould [1], [2], [3] ? o

Sound insulation

Rw [dB] ≥ 44 ? o

Airtightness

Blowerdoortest passed n50 < 1,5 (air change at 50pa) ? o

Costs/ EffortLabour input [h/m²] < 15 h/m² (too less!?) 5.00 ��

Labor costs [ EUR/m²] < 125 EUR/m² 60.90 ��

Material costs [ EUR/m²] <125 EUR/m² 31.43 ��

Total costs [EUR/m2] <250 EUR/m² 182.62 ��

SustainabilityCO2-Storage [Kg/m²] > 60 68.73 ��

PED nre [kWh/m²] < 100 41.76 ��

Wood usage [kg(m²]

Metal usage [kg/m²]

Professional executionFixation 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 4.000 m

Wall height 4.485 m

Total wall area 17.940 m²

Wall thickness 0.450 m

Total wall volume 8.073 m³

1 Strawbales 8.073 m³

2 Wood

posts 8.970 m

profile 0.010 m²

Volume of posts 0.090 m³

beams 32.000 m

profile 0.015 m²

Volume of beams 0.480 m³

bracings 0.000 m

profile m²

Volume of bracings 0.000 m³

Total length of above 40.970

Total volume of above 0.570

3 Boards

roofplate, wallplate - smartply 18mm

length 16.000

width 0.460

Area 7.360

3 Metal parts

Screws normal quality [m]

smaller ones (< 5x120mm) 1.00 m

larger ones 2.00 m

Screws (special ones or stainless steal) [m]

smaller ones (< 5x120mm) 0.00 m

larger ones 0.00 m

Nails [kg]

smaller ones (< 120mm)

larger ones 2.00 kg

Other metal parts pieces or overall 0.00 kg

4 Plaster reinforcements m²

fiberglass mesh 0.00 m²

jute/ hessian/ hemp … 7.20 m2

5 Reed (Base for plaster over timber parts) 2.40 m²

others [which one]

6 Total workload 5h

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