Fra Sverresborg folkemuseum

The log-house as a building system facilitates:

- Replacements of components- Reconstruction - Relocation

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Norsk Massivtre

www.norskmassivtre.no

Massive wood – a monomaterial

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Carbon-storage in biomass

• All growing biomass transforms CO2 from the air to glucose

• The carbon is chemically bonded till the material burns or decomposes

• More biomass material used in buildings could moderate the effects of the rising CO2 -content in the atmosphere

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-1000

-800

-600

-400

-200

0

200

400

600kg

CO

2-e

kv./m

2

Direktebelastninger (fraromoppvarmingetc.)

Indirektebelastninger (framaterialer etc.)

Karbon-binding ( ivegetabilskbiomasse)

Concrete, wood studs and massive wood, lifecycle: 50 years Source: GAIA architects

CO2-balance for different construction types,debit (impacts of energy use and materials production) and credit (carbon storage in biomass)

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www.holz100norge.com

Large, custommade components have low generality

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Architect: Bjørn Berge, GAIA Lista

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“Klimablokken” prototype

Raw materialsLocal and low-grade wood such as

stubs and reclaimed waste

• Environmental efficiencyLow impacts in production phase Low energy need in user phaseReuse/ recyclingHeat recovery

• User needs Self-building optionAdaptability in user phaseLow costs

• Woods’ material propertiesIndoor air qualityThermal insulationCarbon storage

• Production lineWork adaptation

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• Generality; 6M norm• Smaller size;

easy handling high generalitysimple energy recovery

• Connection points accesibilityparallell disassembly

• Product information

Potentials for improvingthe prototype:

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Reclaimed wood• Ca. 500 000 tons per year in Norway• Expected to increase• Ca. 70 % energy recovery• Landfill prohibited from

1. July 2009

Wood waste at Franzefoss(Foto: K. S. Wigum)

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Material supply, Stavne Timber BlockIllustrasjon: Kristin Støren Wigum

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• Indoor air quality

• Heat insultation

• Carbon storage

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Material propertiesof wood

Technical properties of wood are variable according to the direction of the wood fibre cells

Proposed new dimentions: 100x200x300 mm

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Maximum structural strengthMaximum moisture transportMinimum moisture elasticity

Maximum moisture elasticity

Maximum thermal insulation capacity

1. Node connection

+ High flexibility- Requires high precision- Moisture elasticity can cause

problems- Complicated building prosess?

Cog-jointsSource: Sintef Byggforsk

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2. Prestress bonding

+ Structural stability+ Requires less precision- Lower flexibility for construction

and changes- Steel should be avoided

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SRB-DUP prestressed dry-masonry Source: Yamaguchi 2007

3. Independent load bearing structure

+ Simplifies structural calculations + Moisture elasticity less problematic+ High flexibility of infill-partitions- Complicated production?

”Sleppverk” - principleSource: Dag Nilsen, NTNU

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4. “Timber masonry”

+ The mortar works as filling+ Requires less precision- The mortar fillets can be cold bridges - Complicated building prosess?

Cow-barn at Ner-Skjørstad, Oppdal 1840Source: Christian Hemmingsen

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Constructional challenges

The block must provide structural stability locally within each block and globally within the system

Some basic aspects disregarding construction type:

• The direction of the structural stress on the system• The fastening of the dowels • The fastening of the boards

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Massive wood:- building material of tomorrow?

Component design:

• Module based• Small/ medium size• Low/ medium technology• Local production

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