![]() ![]() ![]() With the joists installed radially, they’ll probably sag. Use joist hangers with nail holes all the way down the back flange of the hanger, and put nails in all the holes otherwise, the joists will twist. Situating the joists this way gives plenty of backing for hanging the drywall. Lay out the joists radially, not plumb, as shown in the drawing. Glue up the layers with construction adhesive and nail them together.Ĭarefully align the ledgers on the end walls and spike them with 16d nails to the studs. If it comes out well, make it your pattern to scribe the rest.Ĭhances are you won’t be able to get a full arch from one piece of plywood, so you’ll have to line up several sections and stagger the seams in the top layer over the seams in the bottom layer. Then use a jigsaw or a circular saw to cut out the plywood-arch section. For example, if you’re using 2×8 joists and the first radius is 7 ft., scribe the second at 7 ft. The location of the second arc depends on the dimension of your joist material. Allow only the pencil point to touch the plywood, and you should be able to draw an arc. With no slack in the tape, hold your pencil at the radius measurement and carefully swing the tape across the face of the plywood. Tack the nail at the pivot point and hook your tape on the pivot nail. ![]() With your tape measure and an 8d nail, experiment by moving up and down the line to find the pivot point for the desired radius. Snap a reference line on the subfloor, and center a piece of plywood on the reference line with the long side of the plywood perpendicular to the line. You’ll need a big trammel arm to scribe the radius of this pattern. First you’ll have to cut a pattern from which you’ll scribe all other pieces. To make them, cut the plywood into strips at the desired radius. ![]() I’ve found it’s faster and more economical to make a pair of arched ledgers and to fasten them to the gable walls, then run joists to span between the ledgers to frame the barrel vault. Are arched trusses manufactured for these ceilings?ĭan Daley, a framer in Bend, Oregon, replies: You can buy arched trusses, but they’re expensive you have to special-order them and then wait for delivery. The construction technique was again popularised by the MOMA exhibition and publication ‘Architecture without architects’ (19?) following the example of the Egyptian architect, Hassan Fathy (especially in his publication, ‘Housing for the poor’, 19?), especially as used for brick vaulting in experimental housing by Dave Birrer in Cullinan, and Keith MURRAY’s own house in Zimbabwe and the domestic works of the time of Frederik SNYMAN in Pretoria.I’m interested in building a barrel-vault drop ceiling but haven’t the slightest idea how to frame and sheathe it. The construction of barrel vaults is common in the vernacular architecture of the pioneer colonists of South Africa, particularly for the construction of Powder Houses, Bread Baking Ovens and Whip Haft Kilns. The barrel vault is the simplest form of a vault: effectively a series of arches placed side by side, i.e., one after another. The curves are typically circular in shape, lending a semi-cylindrical appearance to the total design. A barrel vault, also known as a tunnel vault or a wagon vault, is an architectural element formed by the extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance. ![]()
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