Roof Eave Blocking

The roof is the most vulnerable part of your home.

Roof eave blocking.

When you look at the open eave detail you see the rafter tails the blocking and the roof sheathing that extends beyond the exterior wall. Homes with wood or shingle roofs are at high risk of being destroyed during a wildfire. Bumps at the edge of the roof would be a sign that more space should have been provided. Before the roof sheathing goes on the open framing provides easy access for attaching the return blocking and the nailers for the rake soffit.

Provide at least 2 of free air space from the new lower roof eaves all the way to the original roof ridge. Construct a hidden roof intake vent at the top of the building wall by removing the wall top trim or top siding board cutting away any building sheathing or blocking at the wall top nailing 1 spacer blocks 16 on center nailing a new spaced out wall top trim board along the roof eaves and screening the opening against insects. I believe eave blocking is necessary to maintain a load path and avoid rotational forces on the rafter truss but i disagree with you that it is precriptively required by the code. Build your roof or re roof with materials such as composition metal or tile.

The definition of an unblocked diaphragm under 2302 1 does not require nailing to the edge blocking only to supporting members and specifically excludes blocking. If a part of your roof is in constant shadow it may have thicker ice than areas of the roof that get some sunlight. A normal generic assembly could consist of 2x rafter tails acx plywood sheathing and 2x4 or 2x6 blocking between the rafter tails. Remove blocking between the rafters at the top of the outer garage wall at the lower roof edge.

22 in x 3 in galvanized steel eave vent item 2180321 model ev223 1 8. The last pieces to go in were nailing blocks above the ledger for the back of the return and at the bottom edge of the soffit for attaching the rake 20. However it may run into frozen snow and ice inside the gutter or on the eave which doesn t receive heat transferred from the living area. Block any spaces between roof decking and covering to prevent embers from catching.