Tech Bulletin courtesy of ROCKWOOL
Drainage Balance Testing and Wall Comparison
Analysis of drainage and drying potential of ROCKWOOL® stone wool exterior insulation in comparison to extruded polystyrene (XPS)
Implications have been made that ROCKWOOL™ stone wool insulation absorbs water when installed on the exterior side of assembly; and that this absorption negatively affects the performance of the insulation. In-situ applications indicate that altered performance is not detected. In order to adequately demonstrate the implications to be untrue, a third-party investigation was conducted.
RDH Building Science Laboratories (formerly Building Science Labs) was contracted to conduct a laboratory study to determine if ROCKWOOL CAVITYROCK® DD, when installed as rainscreen/drained system, would absorb water during rain events; and compare the results to those of the competitive alternative.
Please contact IMETCO Engineering for more information.