40岁以上的房屋，SE PA，2×4，带有玻璃纤维绝缘。灰泥在这里很糟糕，因此更改为硬皮单。我们正在穿上新的屋顶，摆脱天窗并安装太阳能。这是一个山墙的屋顶，冷屋顶，吹牛 +玻璃纤维。阁楼没有管道工作。它具有山脊通风口 +拱腹通风口 +山墙端通风口。我们有一个5吨热泵。

It would be nice to go around with comfort board since the insulation is so obsolete and not very well sealed but the overhangs are not much (basically non-existent on the gable ends) so we’d have to build the roof out longer to cover it and I have trouble finding contractors that want to do anything even a little out of normal here. How worthwhile is this, and how hard is it for a contractor? Are there things I should consider instead?

谢谢！