What kind of fastener should I use to attach 3/8″ cement board over rigid insulation on our foundation at grade?
When using rigid insulation on the exterior of a foundation, drawings usually show some kind of cement board covering the rigid insulation at grade.
I’m having trouble finding out what kind of fasteners we should be using to attach it. I can’t find any videos, diagrams, or other resources that show this detail.
Does anyone have experience doing this set-up, and if so, what kind of fastener did you use, and were you happy with the results? Does anyone know of online resources I could consult?
Our set-up is 5″ of Roxul Comfortboard 80 on the exterior of our foundation.
We were planning to use 3/8″ HardieBacker board for the cement board at grade (cut pieces approximately 12″ wide around the perimeter of the foundation).
And we think we found the parge coating we want to use: Tuff II. It’s sold in the big box stores in our area (Chicago suburbs). I did a sample board with it, and it seems like it will be easy to use and durable.
It’s just the fasteners for the cement board that are the remaining sticking point.
Any ideas or suggestions are welcome.
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