I would question the qualifications of that engineer, rafter ties can be anywhere in the bottom 1/3 of the rafter.See pics below:
I leave in Northern NJ(Zone 4/5). I have a 24 x 23 Living Room. It is the left Wing on my house. There is no second floor. I have real 2 x 8 rafters old growth old wood. The roof pitch is 12/12 or damn close to it. Half the roof is decked in CDX and the other half is 3/4 tongue and groove pine. Roofing material is Asphalt shingles. This roof used to be thousands of pounds heavier(Slate), but the decay was too severe.
In the pics you see three 3 x 12 beams(3 x 11.5) /rafter ties. The rafters are old thick 2 x 8s and there is no ridge beam carrying the load, nor is it an option. I want to remove my rafters for design reasons. And I have my doubts. I had an engineer come in and take measurements. The engineer said they could remove all three beams. They will resecure the full 2 x 6 collar ties and install 18 guage hurricane/rafter clips on each rafter to the top plate.
I was thrilled to here this of course. But I have done a lot of reading, and I have seen nothing to suggest that I could do this without rafter thrust issues. At minimum, I would like the beams 1 -2 feet higher or maybe use steel rod or cord instead of wood. I don´t think I trust this engineers plan.
Any thoughts and/or advice are welcome.
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I would selvage those pieces just cut them off flush, cut them to length and move the up.