R values, thermafleece 90mm vs quinn therm 70mm?

[Strawman]

Hello folks

I have used an online calculator but thought I would check with a hive mind. I think the thermafleece is slightly better than the quinn therm. What do people think? Or has anyone got any other ideas? It is for a roof. The plan i to then cover it all with wood fibre too.

Thanks

:)

[Iceverge]

For the love of cats I wish people would stop the love affair with PIR, especially in roofs. 

 

Cost

Fire

Ease of fitting, 

Thermal bypass, 

Heat protection. 

Vapour permeability.

Overstated K values, 

Gas migration, 

Shrinkage

poor performance in cold weather. 

Supporting quantifiably immoral manufacturers.  

 

On the other hand the sheep's wool will do fine. 👍

 

 

[SimonD]

2 hours ago, Iceverge said:

For the love of cats I wish people would stop the love affair with PIR, especially in roofs. 

 

Cost

Fire

Ease of fitting, 

Thermal bypass, 

Heat protection. 

Vapour permeability.

Overstated K values, 

Gas migration, 

Shrinkage

poor performance in cold weather. 

Supporting quantifiably immoral manufacturers.  

 

On the other hand the sheep's wool will do fine. 👍

 

 

 

Thanks for expressing that as I now don't have to 🙏 I tend to sound like enough of a grumpy git as it is 😁

[Strawman]

Thank you Iceverge. Thermafleece is recycled plastic, still trying to calculate cost benefit. I had the nasty stuff leftover, it was as easy to fit as thermafleece and have yet to find anything cheaper. Its whether the R values are comparable. Maybe you know another cost effective product which has good insulation? I would be grateful to know. Thanks

[Iceverge]

Pumped cellulose. About it was about €70+vat/m3 when we did our house 2 years ago. 

[Strawman]

Thats useful, cheers