Open Eaves Roof Detail

The wallplate is secured to the internal wall separated by dpc.

Open eaves roof detail.

Open eave construction where the rafters or trusses are exposed is common on new construction. Closed eaves with angled soffit. A roof can come to an end in basically three ways. Types of eaves.

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

If a sprocketted or bell cast detail is used then eaves courses should be no lower than the minimum recommended roof pitch. From left to right. 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. In an open eave design the roof rafters or joists and roof sheathing are visible.

Open eaves with ventilating rafter tray. In open eave construction embers can and do accumulate between blocking and joists and can ignite these members if sufficient accumulation occurs. The cavity is closed with a proprietary cavity closer. The wallplate is then used to secure the rafter to.

A box eave is enclosed with a soffit. With open eaves use a sealant such as caulking to cover gaps or enclose the underside of the roof overhang. A closed eave has very little or no overhang extension beyond the siding. Closed eave where an existing soffit is in place is typical of remodeling projects.

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.