stephanie.palmer@wienerberger.co.uk @sustainasteph Material - PowerPoint PPT Presentation

Acoustics Natural Fibre Insulation can provide comparable or better acoustic insulation compared to mineral based products at a lower density. Variation in fibre diameter and length help absorb different frequencies. Absorption coefficient – fraction of sound energy absorbed by a material at a given frequency. 1 = 100%, 0 = 0% Frequency (Hertz) 125 250 500 1K 2K 4K Nominal Product 50mm Practical Absorption Coefficient Density Rockwool RWA 45 45 kgm -3 0.20 0.50 0.85 1.00 1.00 1.00 Rockwool RW 3 60 kgm -3 0.11 0.60 0.96 0.94 0.92 0.82 Thermafleece 31 kgm -3 0.20 0.55 0.85 0.90 1.00 1.00 UltraWool

Heat • Thermal conductivity of natural fibre insulation varies between 0.035 WmK -1 to 0.044 WmK -1 . • Value varies little with moisture content up to the fibre saturation point (approx 30% mc). • Makes insulation vary stable across a range of humidities.

Sustainability • Local. • Safe to handle. • Rapidly renewable. • Impacts are beneficial and vary depending on product and source but all natural fibres sequester atmospheric carbon for their lifetime.

Finally • Consider all your priorities. • Natural fibres are often the best answer. THANK YOU

T HERE ’ S MORE THAN ONE WAY TO … BUILD A PASSIVHAUS A P R E S E N T A T I O N W I T H C H R I S B R O O K M A N W W W . B A C K T O E A R T H . C O . U K

M Y HOME C ERTIFIED IN 2013 T IMBER FRAME / WOOD FIBRE CONSTRUCTION U- VALUES W W W . B A C K T O E A R T H . C O . U K

A FEW LESSONS P REPARATION D ESIGN VS S YSTEMS / M ATERIALS L IVING W W W . B A C K T O E A R T H . C O . U K

B EFORE YOU START D ESIGN E XPERTS F LEXIBILITY M ATERIALS / SYSTEMS W W W . B A C K T O E A R T H . C O . U K

S OME THINGS YOU ’ LL NEED I NSULATION S YSTEM INTEGRATION R ENDERS W W W . B A C K T O E A R T H . C O . U K

W HAT HAPPENS NEXT ? A IR QUALITY W ARMTH H EALTH W W W . B A C K T O E A R T H . C O . U K

T HANKS FOR LISTENING A N Y Q U E S T I O N S ? W A N T T O V I S I T M Y P A S S I V H A U S ? G R A B M E A F T E R W W W . B A C K T O E A R T H . C O . U K

One"of"the"great"challenges; "" In"building"design"" And"facing"health"&"wellness" Is"moisture"accumulaCon"within"building"fabric"

Quick"Recap" "" " "

Drives""" "" 1."Rising"energy"costs" " " "" " " " "2."LegislaCon" "

Energy"costs" UK "North"sea"Oil"and"Gas" producCon"peaked"in"1999"and" 2000"respecCvely." UK"

Energy"costs" The "UK"importers"Net"60%"of" its"Natural"Gas"requirements." This"will"rise"to"80%"by"2020"as" will"fuel"bills,"by"2V4"Cmes." UK"

Drives""" "" 1."Rising"energy"costs" " " "" " " " " "2."LegislaCon"

Average"UK"Energy"Use"

The most effective solution is a; “High Thermally Performing Building Shell”.

However many “Thermal Solutions”, Can lead to unintended consequences.

Moisture Control Quick Guide; Moisture sources and movement 3.( 1."Internal"vapour"pressure"" 1.( (vapour"producCon,"low"venClaCon..)" 2.( 2."Wind"driven"rain "" 3."Reverse"vapour"pressure" gradient" (solar"radiaCon..)" 4."ConstrucCon"moisture"&"" ground"moisture" 4.(

WDR map

Quick Guide; Design a) 75%+ of building failure is due to moisture. b) You cannot stop moisture getting into the building fabric. • Therefore you need robust measures aimed at preventing it getting in, while accepting b). • And systems that regulate moisture at safe levels within the fabric for when it gets in.

Quick Guide; Materials • Employ materials that are vapour open, and can buffer and wick moisture. • Natural fibre based insulations outperform any synthetic insulation in this way.

Quick Guide; Systems Vapour"check"based"system" Breathable"system"

((PAVAFLEX(((((((((((

Take the risk out of delivering thermal performance

Simple"SoluCons"for"a"Complex"Problem" www.naturalVbuilding.co.uk"

Insulate naturally Healthy, Sustainable, Beautiful 87

Overview Healthy, Sustainable, Beautiful Introduction " Summer Heat Protection " Vapour open construction " Importance of Workmanship " 88

Overview Healthy, Sustainable, Beautiful 89

Introduction Martin Twamley Technical Manager STEICO UK Ltd Based near Munich in Germany, STEICO SE are the worlds leading producer of wood fibre insulations. Production is based at 3 European locations which include Czarnkow in Poland, Europes largest production facility for ecological insulation materials. 90

Overview Healthy, Sustainable, Beautiful Introduction " Summer Heat Protection " Vapour open construction " Importance of Workmanship " 91

Principles of Insulation Principles of effective insulation In order to achieve a robust and securely insulated structure the following key elements should be considered: • U-value • Thermal bridging • Condensation risk • Summer heat protection • Air and Wind Tightness • Workmanship 92

Principles of Insulation Summer Heat Protection The following mix of material properties provide the ideal combination for Summer Heat Protection " low thermal conductivity λ " high specific heat capacity c p " high density ρ " low thermal diffusivity a 93

Principles of Insulation Temperature range at the roof with different insulation materials External temperature Internal temperature with mineral wool Internal temperature with wood fibre insulation 94

Principles of Insulation Reduction of temperature across a building component Amplitude Suppression Phase Shift Ext variation = 40º-10º = 30º Int variation = 21º-18º = 3º 95

Achieving 0.13 W/m2K Woodfibre Glasswool U value = 0.13 W/m2K U value = 0.13 W/m2K Phase Shift = 16 Hours Phase Shift = 7.2 Hours Mineralwool PIR U value = 0.13 W/m2K U value = 0.13 W/m2K Phase Shift = 7.2 Hours Phase Shift = 8.1 Hours 96

Overview Healthy, Sustainable, Beautiful Introduction " Summer Heat Protection " Vapour open construction " Importance of Workmanship " 97

Roof Renovation Getting it right...... Condensation … … can be beautiful! 98

Roof Renovation Getting it right...... Condensation … Grafiken: Quadriga / E.U. Köhnke … not so nice here !! 99

Principles of Insulation Condensation risk No condensation will occur if water vapour resistance on the warm side (internal) of the " construction is 10 times lower as on the cold side (external) Example: " Internal: OSB 15 mm, µ = 200 ⇒ s d – value = 3 m External: STEICO universal 35 mm, µ = 5 ⇒ s d – value = 0.18 m 100