Open Eaves Roof Detail

Open eaves with ventilating rafter tray.

Open eaves roof detail.

A roof can come to an end in basically three ways. Rotted or deteriorated wooden soffits should be removed before installation of new vinyl soffits. A closed eave has very little or no overhang extension beyond the siding. 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.

Types of eaves. Closed eaves with angled soffit. In an open eave design the roof rafters or joists and roof sheathing are visible. Closed eave where an existing soffit is in place is typical of remodeling projects.

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. Open eave construction where the rafters or trusses are exposed is common on new construction. If a sprocketted or bell cast detail is used then eaves courses should be no lower than the minimum recommended roof pitch. Fix timber fillet to set eaves courses of tiles at same pitch as general tiling.

In open eave construction embers can and do accumulate between blocking and joists and can ignite these members if sufficient accumulation occurs. When designing an open eave with roof trusses make sure that you raise the heel of the truss and use a thicker top chord. The main component of any eaves detail is the rafter tail the part of the rafter that extends beyond the exterior wall. The eaves detail shows where the roof members and coverings meet the wall of the dwelling.

Doing so raises the eave which prevents it from conflicting with the window head height. The open eave blocking likely included vents so remember to add an. An open eave has a pronounced overhang often revealing projecting roof beams or brackets. Open eaves with trusses.

With open eaves use a sealant such as caulking to cover gaps or enclose the underside of the roof overhang. A box eave is enclosed with a soffit. Closed eaves with angled soffit closed eaves with flat soffit and no raised heel closed eaves with flat soffit and raised heel. The cavity is closed with a proprietary cavity closer.

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.