0 Helpful?

Exterior door thresholds on slab-on-grade

I'm currently sort of scratching my head over this.

When using under slab rigid insulation and the slab is floating over the footing wall.

Typical details calls for 1" rigid between the slab and the concrete foundation wall as a bond break.

Fig 1 from Buildingscience.com.

Now what happens at entry door thresholds (or floor to ceiling windows)?

Extending a lip from the slab towards the outside (effectively eliminating the 1" joint) would cause thermal bridging, so that's out of the question.

Keeping the 1" bond break, would call to carefully select the door threshold, since most door sills are nailed to the floor right where the bond break is located.

One can specify certain manufacturer and model for the entry door sill, but what to do on a fairly large opening? For instance, a Lift-and-Slide patio door.

Those even have the lower tracks recessed in the concrete slab.

Or maybe I'm just over thinking this and just resting the sliding door track or the entry door sill above the bond break isn't such a big deal.

Fig1.jpg42.09 KB
Asked by SULLKA LIMA
Posted Feb 20, 2013 3:24 PM ET

Tags:

1 Answer

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.

"....just over thinking this and just resting the sliding door track or the entry door sill above the bond break isn't such a big deal."

That's my take on it! No, you can't just nail or screw into foam and there may be some necessary adjustments when installing it, but it's hard to imagine the configuration that would make it a really a big deal.

Answered by Dana Dorsett
Posted Feb 20, 2013 5:45 PM ET

Other Questions in Green building techniques

Do heat pumps and super insulation complement or compete with each other?

In Green building techniques | Asked by ven sonata | May 29, 16

Improvement on the Lstiburek Ideal Double Stud?

In Green building techniques | Asked by Burke Stoller | May 6, 16

Insulating walk-out basement

In Green building techniques | Asked by Geoff Frood | May 29, 16

Best exterior wall design within standard 2x8 dimensions

In Energy efficiency and durability | Asked by chad online:) | Feb 21, 16

Has anyone ever kept sheathing warm and saved labor costs this way?

In Green building techniques | Asked by sean stewart | May 22, 16
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!