How do you build a house to be airtight?
I'm renovating and expanding my existing house on Long Island and struggling to find knowledgeable professional to make airtight passive house. Luckily I was around to correct below ground insulation in time before slab was poured, but need to plan better for above the ground. My contractor is planning foam insulation based on HERS measurements followed by taping leakages and openings. I feel it is not true envelope and will not make it as efficient house as it can be. I'm looking for some guidance here as after hours of reading up on different options it becomes a mess.
Also I'm planning to install ERV system - looking for type recommendations as well.