Open Eaves Roof Detail

The main component of any eaves detail is the rafter tail the part of the rafter that extends beyond the exterior wall.

Open eaves roof detail.

With open eaves use a sealant such as caulking to cover gaps or enclose the underside of the roof overhang. The cavity is closed with a proprietary cavity closer. A closed eave has very little or no overhang extension beyond the siding. If a sprocketted or bell cast detail is used then eaves courses should be no lower than the minimum recommended roof pitch.

The open eave blocking likely included vents so remember to add an. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. The wallplate is then used to secure the rafter to. An open eave has a pronounced overhang often revealing projecting roof beams or brackets.

The eaves detail shows where the roof members and coverings meet the wall of the dwelling. In an open eave design the roof rafters or joists and roof sheathing are visible. Doing so raises the eave which prevents it from conflicting with the window head height. A roof can come to an end in basically three ways.

Closed eave where an existing soffit is in place is typical of remodeling projects. The wallplate is secured to the internal wall separated by dpc. In open eave construction embers can and do accumulate between blocking and joists and can ignite these members if sufficient accumulation occurs. Fix timber fillet to set eaves courses of tiles at same pitch as general tiling.

When designing an open eave with roof trusses make sure that you raise the heel of the truss and use a thicker top chord. To determine exactly what the rafter tail will look like i always make a full size drawing on a scrap of plywood of all the eaves elements including framing and finish materials see illustration above. Closed eaves with angled soffit closed eaves with flat soffit and no raised heel closed eaves with flat soffit and raised heel. Open eaves with ventilating rafter tray.

Rotted or deteriorated wooden soffits should be removed before installation of new vinyl soffits. Open eave construction where the rafters or trusses are exposed is common on new construction. With a soffited eave design the roof rafters and sheathing are hidden through the use of a panel or boards that extend horizontally from the edge of the roof typically being attached to the bottom of the fascia back to the exterior wall. Open eaves with trusses.

Closed eaves with angled soffit.