Asphalt shingles are generally the cheapest option as they are not only one of the cheapest roofing shingles but also one of the cheapest types of roof to install. Metal roofing can also be an affordable alternative as well.

Tarps are made of polymeric materials that are resistant to water, ice, and air. Tarps typically last up to 90 days on the roof, while those constructed of more robust materials can last up to two years. Roofing contractors recommend not keeping it for more than three months, which can lead to further issues.

TPO or Thermoplastic Oflefin These types of roofs have been known to last at least 10 to 20 years, though they can sustain themselves anywhere between 20 and 30 years. TPO is mostly used with flat roofs that are commonly seen on mall or shopping center roofs, warehouses and expansive office complexes.

The cost for roof replacement can be less when you have an overlay. With an overlay, new shingles are installed on top of existing ones. So you'll save on labor costs and disposal. That might be a good idea if the layers underneath are in good condition, including metalwork, flashing, and decking (sheathing).