Stellar Roofing Inc

Roof shingles lifted up; nails under them are not seated properly. The vent was not properly installed. The roof on the front gable has collapsed approximately 3 inches. Flashing is falling off and is not supported as it was prior to the roof install. There is no ice dam sheeting or starter sheet, only shingles placed upside down under the first layer, installed over just tar paper. Shingles are warped in a diagonal line and also warping and lifting when the sun hits them.