I'm not sure how often this was done, but I have a 1920's home in Baltimore whose porch roof is itself a gutter. The wood on top of the rafters is angled to make a depression in the tar coating and channel the water to the downspout.. The problem is that it seems the depression does not slope all the way to the downspout and water has been making little pools abnd has damaged the wood under the roof.
I want to fix the roof, and I don't think I need to recoat the whole roof with tar. A roofer came out and without looking at the roof itself gave me what I think is a high estimate for recoating the entire roof (8'X12'). He said he would put some fiberglass tape on.. and then tar.
Can I just fix the area myself, being a novice?
How common are these types of roof?
Thanks for your help!