If the ice and water shield is not installed properly or the roof is not properly ventilated your structure will experience ice damming. This can result in water leaking into the interior of your house due to the melting and refreezing of snow over the heated areas of your home. This is common along all dormers and the eaves of homes within interior walls that are heated and exterior portions which are not.
The building code in Dayton Ohio considers this a violation. Current building codes require proper installation of all ice and water shields on all new tear off roofing systems. Van Martin has done work for many homes in the communities around Dayton repairing the damage done by ice damming. Contact Van Martin Roofing for more information about ice damming and its prevention.