Salary. During residency training, an OB/GYNâs annual salary may range from $45,000 to $60,000. Salary will increase with each year of training. After residency is completed, the starting salary is generally between $200,000 and $250,000 per year.alary. During residency training, an OB/GYNâs annual salary may range from $45,000 to $60,000. Salary will increase with each year of training. After residency is completed, the starting salary is generally between $200,000 and $250,000 per year.
copper and steel metal roofing is typically made of galvanized or stainless steel sheeting but copper sheets and tiles are also available the cost of a steel roof depends on the sheet profile the finish applied and the size and shape of your roof but offer excellent durability with a lifespan of 50 years or more copper offers an old world appeal to your roof as it ages to a pale green patina and can last up to 100 years
A concrete roof is highly durable and should not need replacing throughout its lifespan. Here are some common estimates to take into consideration for how often to replace a residential or commercial roof: 1  Composition Shingles: 12-20 years. 2  Asphalt Shingles: 15-30 years. 3  Wood Shingles: 20-25 years. 4  Rubber Roofs: 30-50 years. 5  Metal Roofs: 50-75 years.