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Green Building Curmudgeon

Nearing the Home Stretch

Exterior finish work has started and insulation is coming soon

Preformed kickout flashing makes installing this tricky detail easy.
Image Credit: All photos: Carl Seville
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Preformed kickout flashing makes installing this tricky detail easy.
Image Credit: All photos: Carl Seville
This drawing from our textbook shows the proper way to install kickout flashing. TruExterior trim and siding was installed over the Homeslicker rainscreen. We installed trim around the clad windows to provide a traditional-looking detail. This view from the back corner of the house shows the siding installation progress. I'm ready for my closeup, Mr. Demille. Huber brought out a video crew to interview me and shoot the blower door test.

Carl Seville and his wife are building themselves a new home in Decatur, Georgia. The first blog in this series was titled The Third Time’s the Charm. Links to all of the blogs in this series can be found in the “Related Articles” sidebar below.

As our house moves slowly towards completion, I find my stress level reduced, if only slightly. The number of details to manage is only slightly more than the boxes of hardware, lighting, and plumbing piling up in and around my house.

The house is completely dried in and the roof is installed. The siding, exterior trim, and soffit work is underway. It is starting to look more like a house, which pleases us as well as the neighbors.

Shingle roofing

Due to some foolish limitations of my historic district, standing-seam metal roofing is not allowed, so I opted for a standard architectural shingle. There was nothing special about the installation other than selecting a product with a lifetime warranty.

One nice detail I was able to incorporate was manufactured kickout flashing at the roof/wall intersections. I used a product called DryFlekt, preformed out of TPO membrane. The flashing comes in both right-hand and left-hand shapes, and is perfect for keeping that pesky water out of walls.

Kickout flashing is a very important detail that far too many builders miss or ignore. When we are certifying homes it is one of the most frequently overlooked items, often taking weeks or months to get installed, holding up the certification process.

Taking sides?

I was fortunate to locate a talented siding and trim crew that, thankfully, is focused more on quality than speed. We discuss how details will be worked out in advance instead of after they are wrong, and once they start they are consistently productive.

We are installing TruExterior trim and siding from Boral. It’s a fairly new composite product made of coal fly ash and recycled polymers. The manufacturer states that it doesn’t expand or contract, nor is it susceptible to water damage, and it is Cradle to Cradle certified, which should get me some credit towards LEED and other certifications.

Even if it wasn’t as sustainable a product as it appears to be, my favorite feature is the variety of sizes and patterns available. Unlike other composite products on the market, TruExterior is available in multiple authentic siding profiles, as well as tongue-and-groove beadboard, 1x, 5/4, and 2x stock in widths up to 12 inches.

We elected to use their 1×6 resawn siding pattern. Combined with 5/4 corner boards, this pattern provides a much more authentic look than other composite siding products.

Siding is being installed over HomeSlicker vented rainscreen, which will help keep bulk moisture out of the house by providing a gap behind the siding for any rain water to drain out. The rainscreen is installed over the sheathing, after windows, doors, and all pipes and wires are flashed, before the siding and trim is installed.

The video below shows the siding installation.

Zipping along

Although I have used Zip sheathing on renovations before, I have never used it on an entire house, so I was anxious to see just how good a job it does with the air sealing.

Since I installed it on top of my second-floor ceiling joists, I was able to complete the air seal of the entire building envelope before drywall, allowing me to do a rough stage blower door test. As soon as the doors and windows were sealed with foam, I installed the blower door frame and fired up the fan.

Being confident in the airtightness, I didn’t even bother with the larger blower door fan, instead opting for the duct blaster fan, something we typically only do in small apartments. The results were pretty amazing: 670 sfm50 for a 2,600 square foot house, an ach50 of 1.5, or an Envelope Leakage Ratio of 0.11 cfm per square foot.

It probably would have been even tighter had the framers not missed taping a few seams in the attic floor and sidewalls before they framed the main and porch roofs. I expect that the end result will be tighter once insulation and drywall are installed.

Onward, upward, and outward

As I write this I am waiting on my insulation to be installed. I will be using Owens Corning blown-in fiberglass in the exterior walls and attic, and batts for sound in the walls and second floor.

A strong building market and limited workforce is delaying this work, but I’m willing to wait a while to make sure it is done properly. Insulation should be complete by the end of the year, followed by drywall, flooring, and interior finishes early in next year.

Site work, including a few masonry walls and a lot of pervious paving, will start soon. Our current target is to be complete in March. Fingers crossed.

One Comment

  1. JC72 | | #1

    Very nice!
    Speaking of step out flashing my neighbor has an area over her front door where the builder didn't add one. For the better part of 15 years rainwater would back up and spill down the adjacent brick wall leaving serious staining and even moss. It's a complete disaster. I should show this to her and perhaps the HOA will spring for the repair.

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