ROCKWOOL Comfortboard for Exterior Walls: Installation Guide for Contractors
Posted by Core Insulation Supply on May 28th 2026
Mastering Rigid Stone Wool Installation
As building codes shift toward requiring continuous exterior insulation, contractors must adapt their installation techniques. ROCKWOOL Comfortboard® is the premier rigid stone wool board for exterior applications, offering unmatched fire resistance, vapor permeability, and thermal performance.
Installation Best Practices
- Substrate Prep: Ensure the weather-resistive barrier (WRB) is fully installed and sealed over the exterior sheathing before applying Comfortboard.
- Fastening: Use insulation washers (commonly called "plasti-grip" washers) with appropriate exterior-grade screws to secure the Comfortboard tightly against the sheathing.
- Cladding Attachment: Because Comfortboard is rigid, furring strips (wood or metal) can be installed directly over the insulation, fastening through the board into the structural studs behind it. This creates a secure rainscreen cavity for your final siding or cladding.
Equip your crew with the best materials. Order ROCKWOOL Comfortboard in bulk today.