Insurance regulators in Texas are trying to determine whether the Texas Windstorm Insurance Association may have wrongly denied some claims for roof damage following Hurricane Ike, the Houston Chronicle reports. The investigation comes after nearly two dozen policyholders complained about the denial of claims relating to unsealed asphalt shingles. The association contends that it should not have to cover claims for shingles lifted from roofs by the hurricane. However, shingles must be sealed in order for customers to retain their policies.