Wall section at top of foundation

I promised a long time ago to post some better section details to indicate what we are doing for air sealing, water drainage and  insulation. Thought I would start where the wall meets the foundation. I have a few more details in mind, wall at 2nd floor ceiling, attic hatch, and window and door openings.

Let me know if you have any questions.

8 Responses to “Wall section at top of foundation”


  1. 1 Jason Simmons 31-December-2010 at 9:44 am

    Hello, I am looking at the drawing and it look as though the floor joist is sitting on closed cell foam?

    cheers,
    J…

    • 2 Larry 1-January-2011 at 4:49 pm

      Hi Jason,

      The floor trusses sit on the 2×6 sill plate, which sits on a gasket on the foundation wall. There is a double wall in basement as well that might be causing the confusion.

  2. 3 Jim Merrithew 7-January-2011 at 10:56 am

    In the diagram, the arrow for the dimpled membrane points to the inner face of the concrete. Is this right or is the membrane on the exterior of the concrete?
    Is your vapour barrier on the inside (drywall side)of the inner stud wall, or on the outside of the inner studs?
    How did you detail the vapour barrier in between the joists? Thanks – Jim

    • 4 Larry 7-January-2011 at 11:47 am

      Hi Jim,

      The dimpled membrane is on the interior side of the concrete. It is our vapor and moisture barrier. It’s dimpled to let any moisture that does get through the concrete from the outside, to drain to the bottom and out over the footing into the interior perimeter drain below the slab. And to further protect the cellulose, we installed a layer of 2 inch EPS foam over the dimpled membrane. We’re using scraps of rigid foam and spray foam at the bottom of the wall to keep the cellulose off the slab. And we’re spraying foam in the rim joist area to air seal the top of the foundation wall.

      After the cellulose is blown in, we’ll drywall and tape the seams. We’ll drywall the ceiling of the basement at a future date which should complete the interior air sealing.

      Might be easier to see in these two posts, Basement slab prep and Basement slab and first floor framing.

  3. 5 Jim Merrithew 7-January-2011 at 6:02 pm

    Sorry Larry. I discovered your blog site earlier today, so I read the most recent posts first. That’s always a mistake. I found the site so informative that I then went back to the beginning and followed along in sequence. I discovered the answer to my question in the earlier posts. Thanks for the response and for all the great info you have posted. – Jim

  4. 7 Jim Merrithew 10-January-2011 at 11:44 am

    Good morning Larry,
    The ancient Greeks and Romans understood the benefits of solar heating and ventilation. Yet “Modern” humans build their homes square to the road, with no thought to the benefits of FREE solar energy. Too many people would rather own a house with a “killer” kitchen or a designer spa bathroom, than invest in a thermally efficient envelope and save money on heat for the life of their house.
    My dream is to build my own near zero-energy house, with many Passivhaus elements, in Eastern Ontario north of your location. If the first house works well, I would like to design and build similar homes for others.
    For many years, I was a freelance photographer/photojournalist. I was introduced to the benefits of well designed passive solar homes when Harrowsmith Magazine asked me to photograph energy efficient homes for the magazine and for a book called “Sunwings”. I had the pleasure of meeting and photographing Joe Lstiburek, when he was younger (as was I) and developing his philosophy of Building Science.
    In recent years, I have renovated my hundred year old (poorly insulated) house and worked as a labourer in various construction trades. I have seen good building techniques as well as poor work done to “Code”. I learned from the wisdom of the good crews and from the errors of the uninformed builders and designers.
    In my quest to find the best way to build homes with minimal impact on the environment, both in construction and over their life cycle, I have spent a lot of time reading, searching the internet and exploring for wonderful blogs like yours. One of the frustrations has been to cut through the misleading, confusing or outdated information which has been published in various media.
    Thank you for taking the time to write your blog and to explain your philosophy and the thought processes involved in the planning and your construction. Your exploration is like the pioneering adventures of those trailblazers who developed your country and mine. The information you are posting will be very valuable to those who will follow in your footsteps.
    I look forward to following your progress to achieving a dream. 50 Acres of hilly woodland sure beats the concrete/asphalt jungle of NYC. Good luck.
    – Jim

    • 8 Larry 11-January-2011 at 10:21 am

      Thanks very much Jim. Glad you’re finding the site useful. Good luck on your journey and by all means start a blog and tell us all what you learned!


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