![]() In each truss bay, 2×6 blocking provides a backing for the closed-cell spray-foam insulation. An energy-smart overhang Blocking for insulation. So not only did we have to figure out how not to have this detail be a weak link in the building envelope, we had to figure out how to finish the overhang so the homeowners would be looking up at something more pleasing than the underside of the OSB roof sheathing. Here in New England, eaves are more commonly boxed in with a fascia and soffit. On this single-story, hip-roofed house on Cape Cod, we decided to use the eaves to add some character with exposed cedar rafter tails. Of course, this all depends on where you locate your air and thermal barriers. Not only can continuous rafter tails cause a thermal bridge, but they can create a difficult area to air-seal as well. Roof overhangs tend to be one of these details. ![]() The article includes step-by-step photos of the cedar eave installation, and a drawing with details of the eave assembly.Įven as we develop more and more standard assemblies for tight, well-insulated building envelopes, there are always some details that require extra thought and ingenuity. To add eaves without sacrificing energy efficiency, the authors used clipped heel trusses designed to drop below the wall’s top plate inside the house to make room for blown cellulose insulation and a vent channel below the roof deck. Finally, use a handsaw or circular saw to cut along the plumb cut, birdsmouth, and tail cut lines.Synopsis: Architect Steve Baczek and Jim Wolffer of Shoreline Builders describe the process of adding an exposed eave to a sing-story, hip-roofed house. Then, trace the short side of the framing square with a pencil to mark the tail cut. After you’ve done that, rotate your framing square 180 degrees so that the 8-inch mark on the long side of the framing square intersects the line for the tail cut. Make sure the other stair gauge is resting against the rafter and use your pencil to trace the length of the tongue. ![]() Then, reposition your framing square so that the stair gauge of the tongue is on the pencil mark you made to indicate the full diagonal length of the rafter. Once you’ve marked the lines, use your pencil to draw the diagonal length on the rafter. Next, set the framing square on top of the rafter beam and use a pencil to trace the outside edge of the framing square’s tongue. ![]() To cut roof rafters, start by fixing the stair gauges on your framing square to the dimensions of your pitch. The calculator (or math equation, if you’re writing it out longhand) will only calculate the diagonal measurement to the edge of the building.
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