There are a few things you need to look at to determine what your options are. First, look at your contract and see what your options are in the event of non-compliance. You may have to put the contractor on written notice for example. Second, find out if the 3 foot ice shield vs. the 6 foot ice shield makes a substantive difference. Assuming it does, what is the cost to remedy the problem? If the cost to remedy exceeds the value of your retained funds, assuming that your contract allows it, then you may retain the funds. However, if the cost to remedy is less than the funds you are holding, you probably don't have a valid reason to withhold the full amount due.
good sound advice by the other lawyer. Here is what i would do. First put the contractor on notice that they have to complete the work as contracted for, give them a reasonable time to complete, then get the rest of the work done. Pay for it , now you have a record of the cost to complete. Further if you do not have to be worried why did he say he would do it in the first place?
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You contracted for services. You expected the services to be preformed according to the contract. You could take the contractor to court to perform the additional service. You have the money. He will likely want the remainder.
If you don't pay then he will take you to court. As we don't know the amounts, it is difficult to determine your best course of action.
Document everything. Did you take pictures? Is the Ice Watershield visible with the shingle (If the roof has shingles)? Why did you want the 6 foot in the first place?
Again, if this is a lage sum of money, you may hire experts. If it is a small amount of money, it may not be worth pursuing. Again, if you have the money, he will likely take you to court for the final payment. SAVE ALL THE Documentation. If your unhappy, document that to the contractor. Writing, not just verbal. Take pictures. If an archetect or other roofer or contractor comes to estimate or bid the 6 ft of ice/watershield, get it in writing. Figure out the difference in the price done both ways.
This does not constitute legal advice, and no attorney client priveldge has been established.