I'm building a new garage/workshop. When the carpenters installed the flashing on the front of the building, they discovered they had the wrong color drip strip. They told me I didn't need it and installed the shingles without it. My son has done a lot of roofing and told me I (in fact) do need it.
He says I'll have problems later on. I haven't paid the contractor yet.
Do I need it? Is it difficult to retro-fit. How much is it worth to have it put in just in case I have to hold some money and have someone else put it in? The building is 30'X40