A roof a key feature in a building hence you need to keep your roof in good condition.
A properly roofed house adds value when selling.
Avoid hiring semi-skilled contractors who have not acquired knowledge and skills to sort out roofing issues because they may cause damages which may lead to massive loses.
Hire a contractor with the highest success rate.
Confirm if the contractor is authorized by the government authorities to carry on roofing works.
The only way to fight off the cons is by requesting for face to face meetings before giving them a contract. Use Google maps to locate roofing companies within your area.
Ask his clients on how the clients handle problem-related issues.
A contractor who believes on his work will always give a duration that you can test a roof and certify it has the correct standards you requested for.