I’ve recently passed by a new sandwich panel installation just next to the place I live. It’s a drive-through entrance to the E.R. for ambulances: by the law, that building requires materials with excellent fire behavior. That’s why the building company chose to use Rockwool insulated panels. The city council allowed the use of a beautiful fire-red on the outer side to mark the entrance of the building.
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These types of insulated metal panels have the characteristics of fire resistance. That means the manufacturer had tested them to get an E.I. certificate. The test for getting the Resistance to Fire Certification is strict, and it takes into consideration different aspects, apart from the Fire Behaviour of the building element. In particular, the E.I. test considers the capability of the insulated metal panels to prevent the spread of toxic gas of combustion and stop the heat of the fire from crossing a wall. It aims to prevent or limit the spread of the consequences of a fire and safeguard human lives and the integrity of buildings. In particular, the test checks the weak part of any insulated panel, its joints. The joints are the weak part of sandwich panels because it is where an interruption of the insulation occurs.
The best way to improve the tightness of joints is to add two elements: gaskets and screws. The gasket has to be intumescent to avoid burning. The screws play the crucial role of holding the wall panels steady when the fire deforms the metal. The installer must place the screws close to the joints, one by each side. And here we go back to our Rockwool cladding: as you can see in the pictures, the tightening of the screws had been too hard. There is no need to tighten the screws so much that they deform the external metal sheet: once we make such a mistake, we can’t undo it.
The screwing must be firm but not too hard: once the gasket touches the metal, we can stop tightening.
If you have any questions about the fire-resistant insulated panel, please contact us and we will gladly answer them. You can reach us by calling +44 7887 884768 or filling out the form below. You can also reach out to us by emailing sales@globepanels.com . When you contact us, we can provide you with an estimate and explain our products and services in greater detail.
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I am trying to decide between these two exterior insulation types for a house:
– 200 m2, flat roof
– built with Thermo brick (like f.e. Porotherm)
– ETICS/EIFS insulation system
– location: Croatia, the climate is corresponding to Philadelphia
Trying to achieve at least ~35 kwh/m2/a. Probably will end up better, since ERV is also planned (Zehnder ComfoAir Q350), and most glass will be on an unobstructed south side.
Proponents for rock wool are really passionate. But I am wondering if its advantages would mean anything for me. Well, other than fire resistance. Sound is not a problem. But vapor diffusion is something that, no matter how much I read, I can’t really get it.
Since exterior insulation will be thick (8inches), there should be no condensation whatever I choose?
From what I’ve gathered: vapor moves from hot to cold. During summer, this means vapor would be trying to move into the house. In which case EPS sounds better? And during winter, it would move the opposite direction? Do I need, and where to put vapor barrier or vapor retardant? On the inside of the wall, preventing outdoor vapor diffusion, but letting inside vapor to dry to the outside?
So far, I’ve been able to surmise the following regarding the rock wool:
+ fire resistant
+ better sound insulation
+ vapor permeable
– if not done right, can lead to problems
– 50% more expensive
– fewer installers, and consequently, fewer reliable installers
I have read this article and comments, but I’m still in doubt on some things, since my house would be brick and concrete, with stucco, flat roof.
https://www.greenbuildingadvisor.com/blogs/dept/musings/installing-mineral-wool-insulation-over-exterior-wall-sheathing
The price difference amounts to 2% of the whole house. Which is not negligible. Is there a strong argument fo rock wool for someone who does appreciate indoor air quality?
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