GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Elevated floor on piers over dune – Zone 5A

jhrockwell | Posted in Green Building Techniques on

Hi All:

Any thoughts on an elevated first floor assembly which:

– minimizes height from grade (sand) to first floor finish floor;
– maintains 24″ clear between grade an underside of floor;
– minimizes thermal bridges at pier connections;
– resists salt air, pests, etc;
– uses minimal foam;
– must allow free movement of air and flood waters beneath.

John Rockwell
Rockport, MA

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. plumb_bob | | #1

    I do not think a pier foundation should be your first choice for minimizing height from grade, thermal bridging, or pests. A concrete ringwall can do these thing better. Also, rigid foam insulation is recommended for the undersides of floors on pier foundations if spray foam is not used. Building Science Corp. has covered this quite well.
    It will be an excellent choice for allowing air and water flow underneath.
    House on the beach?

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |