EIFS Application and Resulting Water Damage

Our insured is a subcontractor. He installed the stucco on a newly constructed home using the exterior insulation and finish system (EIFS). The homeowner now claims that the stucco was incorrectly installed and water damage has occurred to the house.

The insured has an exclusionary endorsement pertaining to EIFS on his general liability policy that is similar in wording to the ISO endorsement CG 21 86. Is there any coverage at all for the insured in this instance?