Some common types of roof replacements that can be cost effective include:
1. Flat roof replacement - A flat roof replacement is often the most cost effective option for roofs that are in good condition and only need minor repairs or corrective work. This type of replacement is usually done using a membrane and metal truss system.
2. Gable roof replacement - Gable roofs are a popular choice for replacement due to their low maintenance requirements and the fact that they can be modified to match most home styles. This type of replacement is typically done using an arch or gable system and a variety of materials, including wood, metal, or vinyl.
3. Sloping roof replacement - Sloping roofs are becoming increasingly popular due to their unique appearance and the fact that they can provide significant energy savings over traditional roofs. This type of replacement is typically done using a tiled or shingle system and can be customized to match your home's style and architecture.