Why is External Wall Insulation Phenolic Board Better?

Product Description

Phenolic is a light-weight, low thermal conductivity based insulation, which enables high levels of thermal performance to be achieved utilising thinner sections of insulation. Used in our K Systems P external wall insulation (EWI) system, Phenolic insulation is an ideal solution for buildings that cannot increase their footprint significantly or have design features making thicker insulation impractical.

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Phenolic foam is the best, in that it has the lowest U value, usually around 0.02w/m2K. EPS is around 0.035 - 0.038, the lower being graphite injected. Rockwool is in the similar range as the EPS. The main differences are to achieve the required overall U valve or R value, you will have to use thicker levels of the higher U valued products. So in cases, where restrictive thickness are required, then you will require phenolic foam to achieve the required R value. (R Value being the overall required value of the total fabric)
EPS is by far the cheapest. Rockwool is a nice material but it will lose some of it's U value over time as it depends on air within it to achieve it's U value. Similar to how fibre quilt behaves in an attic space. New, it's nice, thick and fluffy, 5 years time, half the thickness and a bit limp, 10 years: throw it away. Phenolic foam on the otherhand should last a lifetime. It is also closed cell, in that when it comes in contact with water or moisture, it will not affect the integrity of the material, whereas, open cell materials, such sprayed insulation loses it's thermal properties on contact with moisture.
If cost is an issue, phenolic foam being the most expensive, then you could opt for an in between called polyiso. This has very similar properties to phenolic foam and has a U value of 0.023W/m2K. It is also closed cell. You will have seen it before, such as insulated plasterboard slabs for walls, rigid roof insulation particulary in dormer bungalows, floor insulation, etc.
Either way, you should have a detailed calculation carried out giving the required building regulation U value, each contractor giving you what their product will achieve, what guarantees they will give you and how long it will perform for at this overall R value. Get references and CHECK THEM OUT.
Also most manufacturers of insulation offer free consultation, free calculations, performances, etc. and are extremely helpful.
Check out: Kingspan Insulation, Xtratherm Insulation & Quinn Insulation. All will offer the above service free of charge.

Hope this helps....

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