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The best way to insulate the exterior of a house has a lot to do with what is going on inside the walls, and how extensive your energy-efficient renovations will be. The following page will help you understand some of the risks and find the best way forward -
The easiest way to insulate walls from the exterior in older homes
But to speak to the products you mention - Rockwool isn’t the cheapest, it also isn’t the highest R value, but it’s a workhorse of an insulation product that can safely be applied to most exterior walls for the main reason that moisture moves right through it, so you won’t accidentally be trapping moisture inside walls. It is also hydrophobic, meaning it is very resistant to moisture and water damage.
There are many ‘all-in-one’ insulation products on the market, Halo rigid panels seem similar to many others, and most of the ones we see work very well when applied properly and in the proper place. The most common reason that a good product can cause a wall failure is by putting it in the wrong place.
The safest advice we can give you is to learn the science behind walls so you can choose wisely. There are some rigid insulation panels with air barriers, vapor barriers, some with none and some with both. In cold climates you want vapor barriers on the interior, so you need to be careful not to apply a vapor-impermeable panel to the outside.
On the Halo website they speak of 'breathability' of the Exterra product, so that's good, though it would be nowhere near as breathable as Rockwool.
Choosing the best exterior insulation will also depend on your climate, so if you tell us your climate zone (or closest city) we may be able to offer a bit more insight. In the meantime, here are a few more pages that will help you find the best option.
Hi Mike
I live an hour north of Winnipeg on lake Winnipeg. It's a family cottage build in 1927 which I now live in year round. there plus R40 in attic and heat crawl space below. The walls are wood chips and some fiberglass where walls have been opened. The siding needs to be replace so was plannin to put Tyvek then two layers of Rockwool comfort board 11/2" with furring strips for a rainscreen and then vinyl siding. The vinyl siding is not my first choice but it is what I can afford.
After this the heat crawl space will be encapsulated and more insulation added to existing.
Any sugestions?????
Cheers thanks for your time.
Also I have read all of you posts on wall insulation very informative.
Hi George, Winnepeg is far from a balmy climate in winter, and if I'm reading that right you're planning on 4 inches of EPS, correct? That's good to hear if so, that's not overkill at all.
The thing about EPS insulation, is that a 'little' on the outside (like 1 or 1.5 inches) can be problematic, but several inches stops being a problem, as it starts acting like a SIP wall (structural insulated panel), and the foam itself is the vapour barrier. So if your plan was either 4 inches of Rockwool or 4 inches of Halo rigid insulation, I'd be less concerned that if you were only putting 1 inch of Halo.
If you go with Rockwool then I imagine the Tyvek is your air barrier right? Tape it well!
Here is another page that may be of value, it's about air barriers and vapour barriers. Glad you're finding value in our pages, hope this all helps!
The Difference between air barriers and vapor barriers