Dense-packed cellulose cellulose question We’ve discussed the possibility of putting Roxul in the cavity. We did this using pretty much the same amount of wood, and only about 15% more labour in the framing stage. In my house I just put the vapour barrier on the inside of the wall and taped and caulked all the holes in order to simplify the construction. Dense packed cellulose will not settle, as it is already more dense that if loose. They enabled him to build the nonstructural exterior wall 4 ft on center and hung them from the eaves. getinthetrailer.com - Browse photos of double wall construction helps save heating with resolution 660x372 pixel, filesize 0 KB (Photo ID #9345), you are viewing image #16 of 19 photos gallery. Some have used truss-joists on end as studs, and this makes dense-packing easier because of the isolated stud cavities but requires more drilling for mechanicals. Cordwood Construction Best Practices is the latest book on cordwood building (updated in 2015) and will give you the whole range of possibilities in a full color, visually attractive, concise narrative. The 12-in. Bean’s quandary is the subject of this week’s Q&A Spotlight. If you have 7,000 hdd, R-40 walls should be the minimum, R-60 for the ceiling. The next issue is that they aren't really at the high end of R values for superinsulated homes anymore. We all our going green. Which brings me to these wonderings...this discussion has pretty much agreed on the R-20-40-60 foundation-walls-ceiling as being the minimum envelope for getting into the superinsulated range of home construction. (please, no hay bale-wood stove suggestions...I am leaning more toward minisplit heating with LPG appliances). (I don't know where he found them.) good comments from a variety of good sources, i agree that the green lumber is great to work with having built homes for over 25 years i hate the kiln dried lumber for framing. Check out these gorgeous double wall pipe at DHgate Canada online stores, and buy double wall pipe at ridiculously affordable prices. Not less. “And can it be done on an already laid concrete block foundation? Canada (NRC) has conducted several projects developing high thermal performance wall assemblies that can be applied in extreme northern climates [35]. Foam exterior sheathing is "simple" like electricity is 100% efficient for heating - in both cases, only at the end use, but ignoring all the ecological and social "externalities" along the way. The insulation can be either fiberglass batt (R-3.5/inch) or blown cellulose insulation (R-3.7/inch) resulting in overall installed insulation R-values of R-33 and 35 respectively.Whole-wall R-value: Using two-dimensional heat flow analysis with thermal bridging effects and average fra… Roxul is a little more rigid than standard fiberglass and was wondering if it would be difficult to install. Set a 4x8 every 6-8 feet, depending on your window/patio door sizes, and strap both interior and exterior with offset 2x4 2' o/c. SIPs of urethane do not require internal structural members and as such go in place much faster and with less labor. I built my double wall house, 1294 sq ft, 30 years ago. If a further increase in R-Value is desired, then start looking at options like adding a Mooney System (horizontal 2x2's on the interior), a third layer of 3/4" foam, or going to a 2x4 double wall. You must be a magazine subscriber to access this feature. Foam - perhaps not all morally despicable Also wanted to point out that the greatest wall assembly won,t be effecitvie without a good air seal. At the end of his presentation Harold also provided a detailed analysis of his projected & actual costs for the complete retrofit including the breakdown on the wall systems. Prolly not green though. So my question is what is dense packed cellulose? The logs interlock at the corners, giving extra sturdiness to the structure. A lumber frame (2 styles avoid full-width studs and thus thermal bridging is minimized) held in enormous presses is injected with urethane at 2000psi. Components of a curtain wall: Following are the structural elements of a single curtain wall unit … The long-term structural integrity of two pieces of OSB (the lowest quality building material in common usage) glued together with plastic foam is yet to be determined. Now what? Glacier is about 30 miles east of Bellingham, WA, and usually sees about 7,000+ heating degree days per year. I was one of the carpenters that helped build the house in the photograph used for this article, which was the Riverdale Net Zero home, built by Habitat Studio and Workshop in Edmonton, Alberta, Canada. I still like SIPs, mainly I just usually don't have room for them on my jobsites. We can look at walls through the lens of construction work, or design. The density should be 3 to 3.5 pcf, whereas loose blown, like in an attic, is about 1.5 pcf. Foam is not the ONLY option. The main difference in framing a double wall versus a single is at corners and intersections. Exterior finsh is stucco on w/l over building paper and fibre board sheathing. How about a recycled-plastic spacer to join the webs, hammer-on, with a gauging feature to hold the alignment true while using irregular local wood. For either this system or my Riversong Truss wall, I prefer a foundation (with insulation) as thick as the wall it supports, but there are ways to use these envelopes on conventional foundations as well. What makes it awkward for new construction is that it creates a secondary insulation cavity. No ceiling lites or outlets, all done from the basement. The R-value of dense-packed cellulose (the most common insulation used in double-stud walls) is about 3.7 or 3.8 per inch, so a 12-in. Based on this study, NRC has recommended using double stud wall, standoff truss wall, structural insulated panel, or structural insulated concrete wall system in wall housing assemblies to reach R-value larger than R. SI-5.3 m. 2 °K/W. Tom M: I see that no one The inner wall will be the load bearing wall, placed over the foundation below. Watch this actual building sequence and see for yourself how you can get a Super Insulated, Air Tight Envelope that is Passive House and Net Zero ready. Less waste? Writing from Glacier, Washington, Karen Bean faces a home-building dilemma that confronts many thousands of people: what’s the best way to insulate the walls of her new house on a modest budget? @Alan, for a natural cellulose basement material look into Durisol, which is a wood chip cement slurry based ICF block, and Faswall, which is identical to it but made in Oregon, where as Durisol is made mostly in Canada. I understand the idea of the Riversong Truss now (having looked at Robert's link)--using the inside chord of the truss as the bearing wall. Robert Riversong Right About Larsen Truss https://www.greenbuildingadvisor.com/homes/nc-home-grabs-five-green-ratings. The ceiling had VB and drywall installed first and the interior walls were installed after. My experience designing and managing construction of new and renovation projects for small water treatment plants and other commercial structures all over Alaska, some dating to the early 70s, tells me that the long-term performance of urethane-injected panelized buildings demands attention. And before anyone goes off on the cost per sq. First, there are 2 basic kinds of SIPs - a sandwich system in which rigid insulation is bonded to skins with adhesive, and the urethane-injected system in which the outer skins are secured in a press and urethane is injected. Double walls homes are constructed with mainstream construction techniques including interior walls and insulation. Current systems using any wood components are flawed for one reason only, the can Rot, grow Mold and cause heavy maintenance cost for the owner. http://www.buildingscience.com/documents/reports/rr-0903-building-america-special-research-project-high-r-walls By using 1-1/2" of foam (two layers 3/4" foam) and R-19 fiberglass cavity insulation, your are outperforming the Washington State Energy Code (Zone 1) by about 50% (by providing a thermal break, Zone 2 now requires a thermal break however) and only increasing the cost minimally, about 5% materials cost over using the standard R-21 fiberglass insulation. I always learn when I stop by. But $/SF is nothing more than a convenience of the real estate market. This system offers the benefits of quick construction and good quality as the components are manufactured in a factory setting. On the homes we designed and built for Habitat this way-the ongoing savings of operations alone reduced the mortgage by 8 years over the traditional construction methods! A Resource for Sustainable Building in Canada. You will then add the outer wall for a total thickness that will yield R-40 or more. Here is a diagram of a double wall post and beam framed home by Cliff Shockey of Saskatchewan, Canada. Thank you for asking the question about building double walls, go for it! If you want more feedback, then start a thread in the Q&A section. builditsolar.com also has a good article about RR's framing, etc. If you are planning a full basement get at least R-10 under the basement floor, R-20 is better. If using this method, the vapor barrier should be protected by a thin board (1/4″ osb or masonite board would work) to avoid accidentally puncturing it. The framer (pictured closest to camera), Adam Larson revealed some of his cost estimates for framing this double wall, as opposed to a conventional single stud wall. Performance is in the details, air seal and insulate everything well. What is clear is that walls in almost all climates need a thermal break. By keeping the wall narrower, you are keeping your window and door casings narrower and reducing the amount of lumber needed in the walls themselves and any trim casings. Perfect for Sips panel, thought I was liking the aspect of using local wood in a truss system. I forget whether it was John Larsen or someone from the audience that pointed out the exterior wall could extend below the floor plate and top of the foundation so as to both seal it and provide insulation down past the floor plate so as to ensure that the main &/or 2nd floor wasn't cold at the outside wall.
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