Windproofing exterior wall

[Rabbithole]

I thought we could start a theoretical/scientific discussion on different types of wind barriers between ventilated facades and insulation. Pros and cons with some discussion. I don't think we should come to the classic answer: "You should have X, that's what everyone uses."

Starting like this:

Exterior gypsum board
+ stiffens the frame
+ compact material that blocks wind very well
- Heavy cumbersome boards
- Unsealed joints (can be taped)
- Adds extra thickness to the wall
- Risk of mold on the board?
- Absorbs moisture that comes through the facade?

Wind barrier fabric
+ cheap
+ a single roll can cover the whole house
+ few joints
+ quick to install
+ thin
+ water-repellent but vapor permeable?
- How windproof is it really?
- Does it withstand UV light?

Fiber cement (like Cembrit Windstopper)
+ cement doesn't mold and lasts long
+ stiffens the frame
+ blocks wind well
- Expensive?
- Fragile/brittle?
- Heavy

Expanded polystyrene
+ insulates while blocking wind
- Uncertain moisture transport/diffusion tightness?
- Flammable

Wind paper?

 

[Rabbithole]

Can probably add the purpose; to prevent wind from blowing into the insulation and decreasing the insulation value. Is this even a problem? Another reason might be to keep the insulation in place. For example, boards or loose fill.

 

[Kallebo]

Facade board (rigid mineral wool):
+No thermal bridges
+Fire safe
+Should be windproof
+Capillary-breaking and draining
+Vapor open
-Expensive
-Leaky joints - can drain water through joints to the frame.

 

[Rabbithole]

The facade board is usually covered with windproofing paper on the inside, so why isn't it placed outward?

 

[Meurman]

Would be interesting to hear thoughts on old paper that sits on houses from around the 1900s inside the panel on the timber... I can imagine that it's diffusive, cheap (if it can be obtained), long lengths, windproof? Fragile...