GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X 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

How to build a waterproof concrete deck over living space?

lamedmem | Posted in General Questions on

I would like to build rebuild my front porch about 20′ x 9′ with a storage room underneath. the porch will have a concrete deck pored over corrugated metal sheets. and the porch is open without a cover.
does anyone know how to spec this the deck has to be 100% waterproof


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. GBA Editor
    Martin Holladay | | #1

    Here's my advice: don't make up the details yourself. And if this is your first time pouring a waterproof concrete deck, get experienced help. You need to hire a contractor who has done this before and who can stand behind his or her work.

    You might want to read this GBA thread: Waterproofing concrete slab.

  2. lamedmem | | #2

    i didnt want to rely on the contractor do you know anyone with experience in this field who can tell me what specs i need to follow

  3. jinmtvt | | #3

    David :

    i would suggest you look into the Schutler company products .
    I know they have products exactly for this purpose
    ( but i have no experience whatsoever with what you are doing ..i've only used extensivly their Ditra membrane )


    EPDM membrane could be other cheaper option ??

  4. GBA Editor
    Martin Holladay | | #4

    If you have never done this, then -- like it or not -- you are going to have to depend on your contractor. Your contractor is the one who will guarantee that the slab is waterproof, and who will stand behind that guarantee with a promise to return if there is a problem.

    If your chosen contractor doesn't inspire confidence, then look around for a contractor who you feel you can trust.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |