Doing a complete replumb of a house built in the 1840s or so. The water to the house is a well with 1" supply to a pressure tank. We installed pre-filters and water softner, and plan to install a 50-gallon propane water heater. The one side of the house has the laundry and a canning kitchen in the basement, a half bath and the main kitchen on the first floor, 2 full baths on the 2nd floor and a full bath on the 3rd floor. The is another full bath on the 2nd floor fed directly from the basement. I'm planning on using pex in trunk and branch configuration.
For the cold side I was going to run 1" trunk from the water treatment from the basement to the 2nd floor. There would be a 3/4" tee off for the hot water heater, the separate 2nd floor bath, the laundry/canning kitchen and the 3rd floor bath. The other 2 full baths, half bath and kitchen would have 1/2" tees per fixture directly off the 1" trunk.
The hot side would be more or less the same except it would be 3/4" trunk, with 3/4" branch to the laundry/canning kitchen, 1/2" branches to the separate 2nd floor bath and 3rd floor bath, and 1/2" tees for the remaining fixtures along the way.
I had an inspector out for a walk through before I started work and he was concerned the 1" trunk wouldn't give proper pressure and also suggested a separate run to the 3rd floor so that it would be able to overcome the height without the other fixtures along the way. The fixtures in the 3rd floor bath would be approx. 35 ft above the pressure tank outlet.
Other lengths that would impact this are the hot and cold trunks are approx. 120 ft, the distance to the 3rd past the 2nd floor baths is about 15 ft., and the separate 2nd floor bath is about 40 ft from where it would tee off the trunks.
Looking for any real-life suggestions for doing it another better way. Looked at manifold configurations but was concerned about each hot water fixture having to wait for the water to get hot separately.
Thanks for the input.