In an earlier post, I talked about 3 of the most important strategies for making a home energy efficient. They were; 1. Air sealing, 2. Air sealing, and 3. Air sealing.

Air sealed, or tight, homes do a better job at containing the conditioned air coming from the HVAC system where it belongs…inside. Tight homes also keep the unwanted hot/humid or cold/dry outdoor air where it belongs…outside. Both of these keep your HVAC system running less, which ultimately reduces your energy bill. In other words, the home is more efficient.

Fresh air should be brought in to the home through mechanical ventilation, which maintains proper levels that fresh air, and can also filter and condition it depending on the type of ventilation strategy employed in your home.

By the way: Tight homes also do a better job at keeping moisture, pollutants, sound and insects from getting!

Stopping Air Flow

If you’ve read Part I and Part II of this series, you’ll remember this detail (below). In the earlier posts, we point out our strategies for controlling moisture and heat flow at the slab-on-grade condition of the Proud Green Home at Serenbe. Today, it’s all about air sealing. (Note: this detail is for a home in North GA, or Climate Zone 3A. Local conditions vary, and each home should be designed for it’s local climate)

Designing for High Performance Slab-On-Grad Part III Controlling Air Flow

The 1″ Zip System R-Panel is made up of the widely used Zip System wall sheathing and a 1/2″ layer of EPS foam insulation. Each of these materials are well know air barriers on their own, but have been brought together in to a single product to act as a structural component, air barrier and thermal break. As is done with their sheathing, Zip Systems Tape is applied to all seams between each panel and at all penetrations. Windows are given extra attention to properly flash so as to prevent air and/or water from finding it’s way back in to the building.

The Zip System Tape not only performs very well at all sheathing seams and penetrations, but it also adheres very well to concrete. In fact, it is one of the better products for this application. We are applying a continuous strip of the tape at the bottom of the R-Panel where it meets the foundation wall. This will prevent air flow at the base of the panels.

The sill gasket shown below the bottom plate, in conjunction with the continuous Zip Tape at the exterior seam between the plate and slab, works well at an area know for a lot of infiltration. We’re also going to be applying a continuous strip of the tape on the inside of the wall at plate-slab junction to provide insurance for a tight seal. Similar attention will be paid to the top of the wall where we will have double plates. Another prime location for air leakage.

Above the slab

In the walls, you will see we will be completely filling the cavities with expanding open-cell spray foam. When installed properly, spray foam will not only insulate our walls but will provide an excellent air barrier in and around the entire cavity.

Finally, we’ve chosen Marvin’s Integrity Windows because of their durability and low air leakage rate. We will install sealant on the back side of the window fin before placing it in the opening. Then, we will use expanding foam between the window and the sill, jambs and head.

Tags: air, controlling, design, efficiency, energy, flow, high, performance, sealing

Views: 2929

Replies to This Discussion

I like that detail of the Home Slicker over the Zip system which eliminates one of my concerns of water being able to collect on the tape ridge plus you add the drainage plane - nice piece & explanation

Any testing for sheerwalls out on these panels yet?

Thanks, Sean.

Here is the ICC-ES report for the R-Panel. They are still working on testing it to use as roof sheathing...still working...

http://www.zipsystem.com/uploads/technical-tips/ESR-3373%20(6-1-12)...

What is the average cost per square foot of the ZIP panel and can I find this product in the intermountain region.

Does the insulated Zip R-panel allow water vapor to pass to the outside, for cold climate installation?

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Bob Blanchette replied to peter chang's discussion Programmable tstat for electric baseboard?
"Savings depends a LOT on how it's programmed. I've even done a setup with a contactor,…"
18 minutes ago
Bob Blanchette replied to Hal Skinner's discussion Any success getting landlords to energy upgrade a single family rental unit?
"Sell utility subsidized services to the tenants. It has to pay back within a year though."
21 minutes ago
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Thx, Robert. Being a PNWester where crawl spaces are moist or wet seasonally & some sites never…"
3 hours ago
Hal Skinner added a discussion to the group The RCC Classroom (Radiant Control Coatings)
3 hours ago
Hal Skinner replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"I can only speak for the one I have worked with over t6he years.  We have a certification for…"
3 hours ago
Chad Mcaulife replied to Chad Mcaulife's discussion BPI QCI Cert.
"Thanks for the reponses.  I have a 40 hr class staring 12-8-2014 which should prepare me for…"
4 hours ago
Hal Skinner replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Hi George, I can see where this could be a HUGE issue in Canada.   We spray our RCC directly…"
5 hours ago
Everblue joined Diane Chojnowski's group
Thumbnail

Hall of Shame

In this group, members share an array of images from the field, showing the kinds of issues…See More
6 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service