Periscope: ventilation layout
In case you missed it, Mark walks us through the planning phase of our ventilation system.
Construction week 32 — plumbing and ventilation runs
First family picnic on our rooftop patio. Shared it with some friendly pigeons who decided our new home was also their new home.
Hope you enjoyed last week’s videos. I sure did. Gave me a break from writing. Writer, I am not. Here goes again:
It’s been a couple weeks since my last construction update. We sent the Cornelis Grey crew away last week. We’ll be bringing them back in a few weeks, once we have more work for them. In the meantime, our plumber Nathan from Ackland plumbing, has begun his rough-in work. He's installing a manifold system? It's cool, or so I am told. And Mark, as you may have seen via Periscope, has begun our ventilation layout.
We walked through the house with our electrician, Yves from Portage Electric, to get a feel for our electrical plan in real life. Wow. When you’re lucky enough to be in a position to decide where to put a switch, and what turns on what, you realize what great ‘power’ you have. And what a massive effect the electrical details potentially have on the user experience and enjoyment of a space. It would really suck to be searching around for a switch that was un-intuitively placed. Or if an unsightly 6-switch was in the middle of a feature wall. What makes sense on paper does not always translate when you’re physically walking through a space.
It also forced us to consider what sort of ‘smart’ lighting/electrical systems we might want to consider. I love the idea of walking into a space and having the lights automagically turn themselves on. Imagine no wall switches? Or lights that learn our behaviour. Will these technologies date our house vs. a tried-and-true analog wall switch? As a happy, budget-friendly medium, we’re looking into Lutron’s Caséta system.
And do we need “cat 5” cable for our internet? If we want to watch Netflix really really fast? I was under the assumption that regular ol’ wifi would suffice for our entire home, but now that the question has been raised, do I want it? Do I need “cat 6” to future-proof? Our neighbours building up the street included some empty PVC pipe behind their walls, for easy wiring access, should they require something they forgot or doesn’t exist yet. I’m going to lean towards less wires = good, whether or not that’s proves to be true. Time will tell.
There are a lot of moving parts that need to come together over the next few weeks, starting with the plumbing, which will carry on for much of this week. Then ventilation followed by electrical. Yves helped us to understand that his job becomes much simpler if he can reuse or follow some of the previous installs. The bigs rocks go in first, then it's easier to fill the gaps with the sand. Or something like that...Once those inside jobs are all finished, we get to cover up those walls with drywall. We’re flying Mark’s brother in from Nelson BC to help us out with the drywalling. He’s a pro, and a Rosen, so it’s bound to be good :) Only 3 weeks away!
We're still placing orders and making decisions on the back-end. We are so frustratingly close to ordering our kitchen. There have been quite a few back-and-forths to nail it down. All of our siding material has been ordered and work is set to begin next week. Really looking forward to that getting under way.
Mark’s sporadically giving tours of the house to various groups. He loves doing them, even though it’s a time-suck. We’ll be setting up another public tour some time in the next couple weeks, likely on a weekend. You’ll be able to see what’s running through our walls before we cover them up. We will post the time and date later this week.
One last thing: it’s spring! With the warmer weather, it now feels relatively cooler when I walk inside the house. Neat-o. Same principles apply to cool our house as it does to heat it. We enjoyed our first picnic of the season out on our rooftop deck. Fealt great.
A tour of students from Algonquin College studying architectural technology. And a view of our messy post-winter construction front yard.
My wee ones staring out the sitting window #milwaukee
Grey water recovery system
Part 4 of casual couch conversations — our grey water recovery system. Flushing our toilets with shower water.
Reusing kitchen heat
Part 3 of casual couch conversations. Counteracting the cooling of our mechanical room, a neutral side effect of our domestic hot water tank.
Domestic hot water heater
Part 2 of our mechanical system, the domestic hot water heater, explained over casual couch conversations.
Our Passive House HRV/heat exchanger system
Part 1 of a video series with Mark casually explaining our mechanical systems as we sit on the couch. There will be three videos following along later this week, going deeper into our mechanical systems. All of which stemmed from my earlier post on appliances.
Preliminary air test results on our Passive House
Before any of our electrical and plumbing work begins, we did a blower door test. This tests to see how air-tight our house is. The test we did was only a preliminary blower door test to ensure that our walls are on track to hit the target, even though not all of our windows and doors are completely sealed yet. We did some temporary taping in a few locations in order to perform the test. We also only performed a depressurization test this time (PassivHaus requires both a depressurization and pressurization test). This is because the temporary taping would have failed under pressurization.
The PassivHaus Standard requires an air tightness of 0.6 ACH50 or better. ACH50 stands for Air Changes per Hour at 50 Pascals of pressure, or the total number of times that the entire volume of air in the house will be exchanged through leakage at a given pressure. 50 Pascals is roughly 5 times the pressure that a house would experience on a cold winter day due to difference in temperatures between the inside and outside, so the test ensures that performance at everyday pressures will be ensured.
The results? We achieved 0.47 ACH50 on the first try!! We are very happy with this result. We will retest the house after the last few windows are completely installed to see how we can bring this result down even lower. The lower this number gets, the smaller and more effective our heating and ventilation system can be.
Early results predictions/friendly wagers. Here's hoping we reach Mark's 0.18 with the final.
Passive House Appliances
Exciting times – appliance showrooms
Choosing our Passive House appliances was no simple task. Our decisions we were largely garnered by a couple very important Passive House principles, in addition to the normal stuff you’d look for in an appliance: cost, performance, reliability, aesthetics, noise level, etc.
1. Low energy use
We have to ensure that our house’s energy demands are under a certain value in order to meet the Passive House standard. We calculate this with the help of the energy modeling software, which requires many different input values. Some, of which, are the EnerGuide ratings for our appliances. They tell you the annual energy consumption of the model in kilowatt hours. The EnergyStar program publishes a ‘most efficient’ list every year, which is a good place to start looking.
http://www.nrcan.gc.ca/energy/products/energystar/why-buy/13612
https://www.energystar.gov/products/energy_star_most_efficient
2. No external ducting
Here’s where our list of options gets dramatically reduced. With our house, we are not venting to the outside (heaven forbid we penetrate the air barrier). As a result, we must find recirculating options for appliances that otherwise would (vent to the outside), such as the range hood ventilator and our clothes dryer. Oh, and since we have no external ventilation, this precludes us from considering a gas cooktop because open flames without external ventilation is a ‘no-no’ for building code.
At first these may sound like Passive House trade-offs, but in fact, Mark and I are seeing them more as ‘trade-ups’. Because why would you want to throw all that warm air (aka. Heat, aka. Energy) out of the house when you could recycle it and feed the energy needs of our house from within rather than pull from the grid? I sure wouldn’t.
With that in mind, here’s what we decided to go with:
Dryer
Whirlpool 7.3 cu ft. HybridCare™ Ventless Duet® Dryer with Heat Pump Technology
The most efficient dryer on the market also happens to use ventless heat pump technology. The same heat pump technology that operates our domestic hot water tank. Bam.
Washer
We’re simply getting the matching Whirlpool washing machine.
Dishwasher
Bosch 500 series - SHP65T52UC
Bosch dishwashers also use heat pump technology, making them pretty darn efficient. This one is whisper quiet, which we like, especially considering our main floor is rather open-plan.
Cooktop
Bosch 500 Series 30” Induction Cooktop
We are so excited that induction technology has made it to the consumer world! There are so many great things to say about induction. It uses magnetic conduction, which is instant, consistent, precise and significantly more energy-efficient than ol’ thermal conducting cooktops (gas and electric) which throw away much of the heat they produce. And best of all, you can put your hand on the burner immediately after taking the pot away. Who hasn’t wanted to do that before?! Well now you can.
Wall oven
Whirlpool convection 30” white - WOS 92EC0AS
Ventilation
Best Cattura Downdraft 30” - D49M30SB
This was by far our most complicated appliance to figure out. Our cooktop is in the island — we like to cook and be part of the action. We have a very large, very beautiful window spanning the length of our kitchen. The last thing we wanted to do was to put a space-aged, over-the-island range hood hanging down from the ceiling, disrupting our lines and views out the window. In order to avoid this, we needed to find a downdraft ventilator — one that sits in the island itself — with a recirculating kit.
Downdraft ventilators are widely regarded as inferior to mounted-above styles because they aren’t able to catch as much of the steam, smoke, and heat, that naturally rises. Even though downdrafts are not quite as effective at removing air, this is less of an issue for us thanks to our induction cooktop. A gas cooktop uses combustion to heat, a natural byproduct of which is smoke (which is why you’re required to vent to the outside with a gas cooktop). With induction, smoke and other pollutants are only a byproduct of forgetting the pot of boiling pasta on the stove too long, which reduces the number of contaminants our blower has to extract from the air. For the most part, our ventilator will only have to remove steam and smells. Any pollutants will be cleared, prior to recirculation, with a charcoal filter.
There are several companies that make these downdraft ventilators, with recirculation kits, that actually pop-up out of the counter to heights as high as 18”. They are all luxury brands. I’ve had a hard time coming to terms with the fact that our downdraft vent, which is inferior to overhead vents, was going to cost as much as the cooktop and wall oven combined. This is one case where design has trumped all other options.
On the ‘up’ side, however, we can take advantage of the recirculated air and improve the overall experience of working in our kitchen. How, you ask?
We will be mounting the fan blower and charcoal filter in our mechanical room, effectively removing any noise from the kitchen itself. No more shouting over a noisy fan motor. And by moving the warm cooking air into the mechanical room, we will be augmenting the energy source for our domestic hot water heater. Our domestic hot water tank is a heat pump model, which pulls heat in from the surrounding air through a compressor and into our water. The surrounding air (in our mechanical room) becomes slightly cooler as a result. Our downdraft air supply will help make-up some of that heat lost to the hot water tank, and reduce our requirement to pull from the grid.
Make sense? I’m not surprised if it doesn’t. I’ll be posting a video of Mark explaining this to me with helpful diagrams likely tomorrow....
So there you have it. Some big decisions made. Each decision turns out to be more of an ordeal then at first glance. I know more about dishwashers now than I ever thought I needed to know. But I'm glad I took the time to do the research and understand. As we are doing with every aspect of our build.
I should also note that we purchased a Consumer Reports Online subscription for the duration of the build to help us with some of our research. It’s been most helpful so far in choosing our appliances. http://www.consumerreports.org/