Live from the Test Buildings, it’s the Thermal Mass and Buoyancy Ventilation Research Project team. After swiftly assembling the Test Buildings, the graduate team began weatherproofing. The team’s goal is to have the buildings protected from rain quickly so they can get to work on installing the thermal mass panels on the interior. The weatherproofing systems are designed to mitigate heat gain in different ways to eliminate experimental variation.
First, the team covered the buildings in shingled tar paper–a heavy-duty, waterproof construction paper. Next, the team installed battens which create space between the structure and cladding allowing for ventilation and avoiding heat gain. The roof is also ventilated and covered with highly reflective, low albedo corrugated sheet metal. This means the materiality and color of the roof are fighting solar radiation.
Lastly, the team installed the beautiful steel door frames. Turnipseed International donated the steel and Brad of Superior Metals LLC welded the frames Thanks for reading and stay tuned.
Make way, dear reader! My crew is steaming ahead at an alacritous boil and would take several miles to stop given their momentum. Where I last left, I detailed the process of erecting the columns and trusses that support Reverend Walker’s Home’s grand pavilion roof. In this entry, you will see the roofing process through to the end. With truth, dear reader, the hot and muggy days have affected me. Most of my time is now occupied with napping. However, my crew, motivated by the promise of a permanent shade structure, carry on without my constant oversight. I trust them to be the thoughtful and disciplined design-builders that I know they are. Let me begin to describe our progress.
After securing the six steel trusses that hold the roof up, the next step was to bridge them with 2″ x 6″ purlins. Purlins provide a surface to screw sheets of roof metal onto. In our case, the purlins are painted white to help brighten the porch areas under the roof. The process involved trimming the 2″ x 6″ material, passing them up to two team members on the scaffolding above, placing and securing them into the manufactured purlin clips that came on the trusses, and bracing them to be 2′ on center. We repeated this process for each bay.
When we finished up the purlins we were ready to put our galvalume r-panel on. On steep roofs, we generally predrill holes on the ground for easy screwing. An issue we quickly discovered with this method is that purlins are normally flat, providing a large surface to drill into and greater tolerance. Our purlins are vertical, meaning much less tolerance. Given that wood is rarely straight, we would have to continuously measure to ensure the holes were drilled in the right spots.
After getting the sheet metal up, the final step was the ridge cap. For this step you will need some ridge cap and a Paul. We used a system of ratchet straps to get the lengths of metal up to him.
As you might have gathered, dear reader, the trust that I have placed in my crew is well-founded. I have done my duty as Captain, and through strict leadership have made them into good sailors. It appears that I may allow my management style to relax in the future, given the frequency of scratches does not suffer any loss. I have little worry of it, dear reader, for they both love and fear me. Ah, it appears scratch-time is immanent. I must cease my musings for a time, but rest assured I will be back with more updates on Reverend Walker’s Home in the near future.
Live from inside the mock-up that spanned seasons, it’s the Thermal Mass and Buoyancy Ventilation Research Project team! You may remember the mention and drawings of a mock-up back in January. Many things interrupted steady work on this mock-up including breaking ground, pouring foundations, steel design, steel fabrication, writing papers, installing drainage, designing the cooling porch, and testing concrete panel joinery types. However, after all this time, the mock-up is complete! In the two weeks before Pig Roast and graduation from the master’s program, the TMBV student team not only hoisted the test building columns and submitted a paper detailing their experiments, they also completed two mock-ups. That’s right, two–we’ve got a bonus!
Faux SIPs and Small Columns
This mock-up set out to test the ventilated roofing and cladding system while also allowing practice for some of the atypical waterproofing details caused by the chimneys. All elements of the mock-up are at full scale, however, these elements are taken from different sections of the Test Buildings and condensed. Therefore the real Test Buildings are not proportionally larger than the mock-up. Another disclaimer; the team only built one mock-up because the two Test Buildings are exactly mirrored.
The team first assembled wall, roof, floor, and chimney stud formed panels with exterior OSB sheathing on both sides. These acted as stand-in Structurally Insulated Panels (SIPs) which make up the enclosure, structure, and insulation of the Test Buildings. Next, they assembled these faux SIPs atop three shortened columns which have the same thickness and base plates as the Test Building columns.
Groovin’ and Waterproofin’
Next up–keep it dry with tar paper and roofing. Tar paper is a heavy-duty construction paper made with asphalt which repels water. The TMBV team wrapped the entire structure in tar paper in a shingling pattern to create a protective layer. After this, the team started roofing.
To minimize heat gain the roofing material is a light-colored, reflective 3/4″ corrugated metal. The metal is attached atop batons which run in parallel with the slope of the roof. This allows the roof to vent heat at the highest point of the structure. If there is one thing this team has learned in two years–hot air rises.
The team installed the flashing along with the roofing. Flashing is a thin piece of impervious material installed to prevent the passage of water into a structure from a joint or as part of a weather-resistant barrier system. The TMBV test buildings use galvanized aluminum as flashing. A large tray prevents water from slipping under the metal roofing while T-shape pieces seal the edges and create the corners.
A mini-door frame was fabricated by Brad Schmidt of Superior Metal Works LLC in Newbern, AL. He will also be fabricating the full-size door frames. This was the bit of steel the TMBV team left to a professional–boy does he do nice work! The team painted the door frame with galvanizing paint, as they did the mock-up columns, to see how all the colors of the steel, roofing, flashing, and cladding work together. The door frame installation couldn’t have gone smoother!
Last, but certainly not least, the cypress cladding. 3/4″ 1″x 6″ and 1″ x 8″ cypress boards were sanded and sealed with Kabotz wood bleach. Spaced at 1/4″ the boards created an open joint cladding system, which like the roof, allows for air circulation behind the cladding. Cladding the chimneys and the underside, which will be the cooling porch ceiling, was the trickiest part. Doing the mock-up, however, teaches the students tips and tricks for doing the real thing.
Not much more to say, just look at that mock-up!
The team also completed ANOTHER concrete wall mock-up testing a shiplap joint in between the thermal mass panels. This wall is a proportionally smaller version allowing the team to visualize the pattern on the wall as well as the screw spacing. The shiplap joint, from both a constructability and scientific validity standpoint, is a crowd favorite. Not to mention that craft and beauty…
Roasting in the Sun
On a bright, early, shiny Tuesday all the Rural Studio 2021 Spring Semester student, faculty, and staff enjoyed an in-house Pig Roast. This included an opening ceremony at the beautiful Horseshoe Courtyard, presentations from each team, a ribbon cutting ceremony at Ophelia’s Home, and lots of good food.
After a BBQ lunch, the TMBV team sprang something else heavy on the audience… their project! They had a wonderful discussion with the only outsiders at the celebration; Architects Roy Duvall, of Duvall-Decker in Jackson, MS, and John Forney. It was wonderful to show off all the hard work the students have accomplished since October 2019. From experimentation and coding data to SIPs detailing and steel fabrication these students have continually jumped into waters unknown.
Overall, Pig Roast was wonderful, but the work was not over. Pre-Roast the team installed their columns and finished their mock-ups. Post-Roast they had to complete a paper detailing their TMBV experiments and results for an international building science conference. They worked tightly with Salmaan Craig for the rest of the week. Because, of course, the paper was due that Friday and graduation was also that Friday.
This team just couldn’t function without the variation of personalities and skillsets. No two are alike, and sometimes it’s hard, but they couldn’t be more thankful for ending up on this wild ride together. 4 hours before the paper was due, Cory and Livia scooted to Auburn for graduation. Jeff and Rowe continued working with Salmaan, up until the deadline, for which the other two are eternally grateful. Jeff and Rowe were at graduation in Livia and Cory’s hearts illustrated below. Don’t worry. the whole gang will celebrate together with a classic Cory cook-out. Stay Tuned for the impending construction of the TMBV Test Buildings!