BBP Slovakia

European strawbale building methods

Leonardo da Vinci_PARTNERSHIPS 2009/2011_STRAWBALE BEST BUILDING PRACTICE IN EUROPE

1. General information

Method of construction: Post and Beam (wrap ID: PB-‐02Representative: Boris Hochel

Contact: [email protected] www.ozartur.sk

Table of Content

Personal quotationFirst SB method with official building permition in Slovakia in 2006.

7. Questionnaire

9. Evaluation sheet

2. Visual description of the method-‐11. General information

3. Visual description of the method -‐24. Technical drawings 2D5. Explanation of the method6. Calculation sheet

8. Sustainability



2. Visual description of the method-‐1 Evaluation of best building practices3D – 1


Contact: [email protected] www.ozartur.sk

view from exterior

wraping with strawbales from exterior



3. Visual description of the method -‐23D – 2


Contact: [email protected]

view from outside

view from inside



4. Technical drawings 2D Evaluation of best building practices



without scale



5. Explanation of the method Evaluation of best building practices



Stone foundations Post and beam construction including roof and floor

Wraping strawbales arround the house with a help of boards

Interior with painted earth plaster

General overview of the house

Plastering strawbales with clay from exterior



7. Questionnaire



1

2

3

4

Fixation of balesHow are your bales secured in the wall?Wooden boards push the bale against the wall fixed with hook and rope. Hazel pins are also used to fix the bales

3.1 How do you deal with potential of rain bouncing from the ground surface and ground humidity?

Bales without gaps

Moisture

How do you ensure tightness of the strawbale wall insulation (stuffing gaps between bales with loose straw for example)?

Stuffing the gabs with loose straw

3.2 How do you deal with possibility of water intrusion from building’s interior at each floor level?

First we built the wooden structure infilled with bricks and the roof. The walls are then wrapped ith strawbales from outside

Bottom of the first row of bales is lifted minimum 45 cm above the ground

With 2 layers of clay plaster and finishing layer of lime plaster

Bales

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

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?

Irrelevant

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



7. Questionnaire



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?

Wall coating

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

How do you ensure bond of the plaster/render (if included in your wall’s assembly) with the straw?

5.1 Plaster

Fixing all the gaps, in the floor is breathable foil under the balesFire resistance

Yes

Airtightness

3 layers of render

How do you protect the walls from fire, while building and after? Do you refer to official approvals?



8. Sustainability



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

BBP Slovakia

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