The internal. structure of the cargo tanks, often un-coated, is exposed to potentially. corrosive gases, sea water, crude oil and oil products. The effect of this corrosion over a period of years is to reduce the. material thickness and hence the strength of the structure. Classification.
It will cost $300 to $400 per day to hire a general contractor. Many times, a general contractor will also be a carpenter and do a lot of the work that needs to be done.That is a great help and cost savings to the project.Whether a general contractor will do work on a project depends on their skills and the outlook of the job. If your general contractor does not do any labor he may want 10% to 20% of the cost of the project.If he does the carpentry he will want 45% to 65% of the money paid to contractors on the project.hat is a great help and cost savings to the project. Whether a general contractor will do work on a project depends on their skills and the outlook of the job. If your general contractor does not do any labor he may want 10% to 20% of the cost of the project.
1 Lastly, there is the need for roofing cement, which is costs approximately $22 per gallon; and. 2  The Labor-according to HomeInspectorLocator.com a roofing contractor will charge around $3 per square foot for all aspects of the work, making this project run at a cost of $4500. This is usually rolled into the per square foot price of the project; 2  The Materials-the average sheet of roofing quality plywood that measures 5/8 thickness is roughly $20. 3  For this project it is going to require around 40 sheets for a cost of $800.