It cost me six bucks back in 2001 and appears to be about 40 bucks now at amazon. Starting from bottom, first course of SOLITEX MENTO PLUS is rolled out across trusses. Visit our subscription preferences page to subscribe to Industry News or manage your email subscriptions. Probably because tape measures have red marks every 16 inches, and we are all accustomed to framing at 16 inches on center. A handy book that I used to keep in my truck was the US Span Book For Major Lumber Species written by the Canadian Wood Council. We hope this collection of videos, detail drawings, photos, and articles can help you can implement advanced framing on your site efficiently and effectively. That’s it.. Spray foam, especially closed-cell spray foam, will cling tenaciously to siding, gluing everything together. SBC Magazine is publishing this story to raise awareness of information publicly available online and does not verify the accuracy of the author’s claims. When I began my carpentry career as a framer, I loved the structural aspect of what we built: a jungle gym that got bigger each day until it finally became a house that could withstand hurricanes and ice storms. has been in the code for longer than the IRC has existed. The idea is to create an air gap between the siding and the rigid foam. If you have any comments or corrections on this article, please email us and we can publish your comments. It’s the way most houses achieve shear strength and provide a nail base for siding materials. How could more wood NOT be better? Fold over the extra inch on each side to form a stapling flange. o.c. The next couple of problems with advanced framing—wavy drywall and siding—are a direct result of crowned or crooked studs — the best way to limit waviness of walls to cull the stud pile of the cruddy stuff. For starters, 24 in. air gap between the back of the siding and the felt. Once they are in position, rectangles of rigid foam can be inserted (cut-and-cobble style) against the spacers in each stud bay. Your house has wall sheathing -- namely, tongue-and-groove board sheathing, a type of sheathing that was very common 100 years ago. Parting Shots: Let it Snow, Let it Snow, Let it Snow. A second option for insulating a wall with no sheathing is to use spray foam. Also note that porous netting was added at each truss to partition truss bays prior to cellulose dense-packing to make it easier to achieve uniform density. The structure of houses continues to change, and so-called Advanced Framing is the 'newest' iteration. Unlike for conventional roofs, care must be taken to step only on structural members. or 1 in. While platform framing is generally faster and safer, we find balloon framing is an efficient and safe way to build many of our tall walls—especially gable-end walls (aka rake walls). Some people recommend omitting most of the wood wall sheathing in favor of exterior rigid foam, using plywood or OSB on the corners and in shear wall locations. As on the roof, SOLITEX MENTO PLUS was used as the airtight sarking membrane for the sheathing-less vapor open walls. But how can that be? But the felt has a rough texture and will be wrinkly enough to keep air between the felt and siding, even when compressed by the spray foam. was added per our best practice service cavity recommendation. Cut the felt as long as the stud bays, but about 2 in. The 2” wide tape is first applied to the backside of a batten, then the release paper is removed before final fastening. Seal air leaks at the perimeter of the rigid foam Matt likes it because it saves the builder and the homeowner money while delivering a more comfortable quiet house. They also cover corners, headers, and wood sheathing panels. In addition, the spray foam may ooze out of cracks between the siding as it expands, forcing the siding pieces apart. Three Tree Home Performance based in northern Vermont is a versatile home energy efficiency company that “uses building science to make homes safer, healthier and more efficient”. Engineers like advanced framing because it reduces thermal bridging, which causes heat loss and condensation. When it comes to building a wood framed house, one of the typical ingredients we have come to expect is exterior sheathing. Polyurethane foam has the added benefit of sealing air leaks, but you shouldn’t consider installing it directly against the back of the siding. The most common choice is rigid foam. Environmentalists like advanced framing because it uses less wood, which is a precious natural resource. Second course of MENTO PLUS, seams taped with TESCON VANA, followed by 59” battens. Using air-permeable insulation with rigid foam TESCON NAIDECK double-sided butyl tape is used for sealing screw and nail penetrations that fasten the battens through the MENTO PLUS to the structure below. thick.) The rigid foam functions as an exte rior air barrier and is also a substitute for the missing WRB. If you plan to fill the stud bays with airpermeable insulation (fiberglass batts, blown-in fiberglass, mineral wool, or cellulose), the material you use to create the air gap needs also to be an air barrier. If your local code official insists on an interior vapor retarder, install a “smart” vapor retarder (one with variable permeance) such as CertainTeed’s MemBrain. to 3⁄4-in. It was instead of INTELLO PLUS across all wall and roof interiors, and taped with TESCON VANA. If energy performance is your goal, big fat hunks of wood in walls that don't need them is a good place to start. The result is a sheathing-less house that brings the highest performance European airtightness and vapor control technologies to a New England single family home. As shown, the standard 59” wide MENTO PLUS is preferred so the membrane can be applied upward in manageable installments (118” double wide MENTO PLUS is also available). Once this rigid-foam air barrier is sealed, the stud bays can be insulated normally. How do you insulate stud bays from the inside if the building has no wall sheathing or water-resistive barrier (WRB)? Foam thickness Using spray-foam insulation Check out this extra section in each digital issue of SBC Magazine for additional news, perspective, and advertiser content. sq.) Horizontal strapping at 16” o.c. As the spray foam expands, it tends to push against the felt, reducing the depth of the air gap. Substituting 5/8-inch drywall instead of 1/2-inch drywall also works to stiffen and straighten the wall. or less, the rigidfoam layer needs a minimum R-value of R-5 in climate zone 5, R-7.5 in zone 6, or R-10 in zones 7 and 8 to prevent this type of condensation. (Open-cell foam is also an option, but it must be at least 3 in. But while familiar, it’s a recipe that can prevent robust drying of the assembly, raising the risk of moisture damages and mold. The formaldehyde-based glues often found in sheathings like plywood or OSB can additionally inhibit great indoor air quality. That's pretty much how timber framers felt when balloon framing was invented in the 1830s, and how Victorian-era balloon framing holdovers felt when platform framing and power tools were introduced in the early-mid 20th century. Use an ordinary staple gun to secure these flanges to the sides of the studs, making sure to leave a 1⁄2-in. When a rainy day is followed by a sunny day, the exterior side of each piece of siding will be dry, while the interior side will be wet. Why he likes it: As a consequence, SBC cannot vouch for the validity of any facts, claims or opinions made in the article. o.c. Finally, the spray foam will limit the ability of the back of the siding to dry. The Pressfix squeegee tool is optimal for pressurizing the tape for a permanent bond, especially where the reinforced membrane has no support across gaps between trusses, rafters and studs. For this project, horizontal battens were added for a metal roof. Some people recommend omitting most of the wood wall sheathing in favor of exterior rigid foam, using plywood or OSB on the corners and in shear wall locations. And significantly, all that sheathing simply is not needed - it’s just more stuff. Overkill is fine as long as it does not work against you. If this happens, you’ll end up with an unsightly mess that’s difficult to fix. Like INTELLO PLUS, DB+ is resilient enough for direct dense-packing, but experience and equipment can make the difference for a perfect installation. They're awesome. Advanced framing has been around for fifty years or more, but somehow it is still new to many framing crews. The easiest way to create the necessary air gap is to install wooden spacers (3⁄4 in. unfaced EPS has a permeance of 2 to 5.8 perms). Wood is good. unfaced EPS for the foam layer. These Pro Clima components together with sheathingless wood frame construction provide optimized insulating and moisture-control conditions that enhance sustainability and comfort while eliminating unhealthy sheathing products.


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