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I want to install a standard toilet in my attic. I have 5 3/4 inch rough cut rafters. Will this be enough room to install the 3 inch pipe and flange etc with a sufficient amount of pitch? The run will be about 2 feet until it drops to a 90 to the 4 inch cast iron drain pipe. I may be able to get more space by chisel the lath and plaster but seriously doubt I can get from the ceiling access. Also my main is a soild 4 cast iron pipe. I've used fernco for my washer but do how would I connect this 3 inch at angle to it? thanks in advance