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See material info in column to left.

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Free account registration for BRE Green Guide

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Free account registration for BRE Green Guide

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https://www.bregroup.com/preference-centre/login.jsp
We will use the BRE Green Guide for our workshop and this will give you access. https://www.bregroup.com/greenguide/ggselectelement.jsp?buildingType=Housing

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CALCULATING THICKNESS INSULATION for U-value of 0.15 W/m2K

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CALCULATING THICKNESS INSULATION for U-value of 0.15 W/m2K

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FOLLOW WORKED EXAMPLE FOR AT LEAST 1 MATERIAL

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FOLLOW WORKED EXAMPLE FOR AT LEAST 1 MATERIAL

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OPERATIONAL CARBON FOOTPRINT (DESIGN MATTERS RESULTS)

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OPERATIONAL CARBON FOOTPRINT (DESIGN MATTERS RESULTS)

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Glasswool: 79, 7 kgCO2e for 10 kg/m3 and 638 kgCO2e for 80 kg/m3
EPS: 154 kgCO2e for 20 kg/m3
PUR: 206 kgCO2e

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glasswool 1 - 79, 6 kgCO2e for 10
glasswool 2 - 637,2  kgCO2e for 80
EPS - 154 kgCO2e
PUR - 205,6 kgCO2e
Woodfibre - 29,1 kgCO2e

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Wood Fibre emb.carbon: 29 kgCO^2
sequestration is: 149kgCO^2
carbon footprint is: -120kgCO^2

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EPS: ~154 kgCO2e

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PUR: 206,08 kgCO2e
Glasswool: 637,99 kgCO2e
EPS:
Wood fiber: 29,16 kgCO2e

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Glass wool 10 kg/m3: ~79,75 kgCO2e
Glass wool 80 kg/m3: ~638 kgCO2e

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Glasswool 1
80 kgCO2e
Glasswool 2
638 kgCO2e
EPS
154 kgCO2e
PUR
206 kgCO2e
Woodfibre
-119,64 kgCO2e

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Glasswool 1 : 2,5%

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Glass wool 10 kg/m3: 0,02456 ~ 2,5%
Glass wool 80 kg/m3: 0,16815 ~ 16,8%

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Glasswool: 2.5 %
Glasswool 2: 16.8 %
PUR: 6.1%
EPS: 4.7 %
Wood fiber -3.65 %

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glasswool 1(10) - 2.5%
glasswool 2 (80) - 16.8%
EPS - 4.7%
PUR - 6.1%
Woodfibre - 3.9%

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Glasswool 1
2,5%
Glasswool 2
16,8%
EPS
4,7 %
PUR
6 %
Woodfibre
-3,9%

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We compared EPS and PUR that turned out to be quite similar materials. To get to the same result in operational carbon, PUR had more embodied carbon and slightly worse rating in BRE green guide which makes EPS winner out of these two.

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EPS 154 kgCO2e
PUR 206 kgCO2e

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EPS = 4,6 %
PUR = 6,1 %

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Glass wool differences

With lower glass wool density (10 kg/m3) compared to the higher one (80 kg/m3) there is a substantial decrease in human toxicity, embodied carbon and acidification pushing the overall score from A to A+

One would assume the lower density to be better in every case but if you take into account the U-value and requirements of the wall, say wet module thickness it becomes more complicated

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Generally, we looked at different densities of glasswool and also EPS. It turns out that for the environments that need less insulation, glasswool is better and has a better impact but when it needs to be used in denser quantities than it has a much larger impact and EPS can be a better alternative for long-term impact. (more thoughts from the group in comment section)

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Glasswool 1 seems better in almost every aspect and needs less material. nr 2  is probably better for sound  insulation.

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Woodfibre seems to outstand the rest of the insulation materials. At least on the paper.