Foundation drainage and exterior insulation
I am located in Massachusetts. My house sat on a stone foundation with zero to eighteen inches clearance between the floor joists and soil. I decided to have a new foundation installed–full basement. The work is underway and they are getting ready to set the forms to pour the walls. The contractor insists that no drainage system is needed. The lot is relatively level, though the street is somewhat elevated relative to surrounding area, My gutters work fine and the finished grade should slope away from the house on all sides. Should I take their word for it and not install a drainage system, or should I insist on having it done while it is still possible to do it? Is a foundation drain system required by code in MA? I haven’t been able to find out through the internets.
Also, I plan on installing a product such as roxul drainboard on exterior of foundation and will probably go with sub-slab insulation (though the contractor doesn’t see the point of that). Besides the exterior insulation, are there any other things I should take into consideration before walls get poured and back-filled? I just want to make sure I think of everything while it’s easy to do it, considering we will use this space as living space sometime in the future.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part