Roof Eave Blocking

Once an eave overhang or soffit has ignited fire can spread onto the roof into the attic or onto and through the exterior wall.

Roof eave blocking.

I sorted out the roof sheathing plane and. Soffits normally have vents as part of the attic ventilation system. If the 2 by rafters are spaced 24 inches on center the blocks are 22 1 2 inches long. Typical design and construction eaves.

Download citation is roof eave blocking required to transmit wind seismic forces. 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. Roof pitch of 30 degrees. A normal generic assembly could consist of 2x rafter tails acx plywood sheathing and 2x4 or 2x6 blocking between the rafter tails.

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. If the 2 by rafters are spaced 24 inches on center the blocks are 22 1 2 inches long. The engineer may try to use another method to transfer the forces from the diaphragm into the shearwall however blocking is the easiest and most common method. Then we sheathed the wall all the way to the top of the rafter blocks and i laid out the eave blocking.

In addition boral roofing s offers vented eave risers as part of boral roofing s energy efficient roof system that allows natural intake of cool fresh air to keep the roof system cool in summer and dry in wet winters. Assume that for venting you need three 2 inch diameter holes spaced equally along the block. We needed a solid connection between the eave and the wall framing so i installed 2 3 blocks over the wall sheathing with flatlok screws driven into the eave blocks top plate and wall studs. With 2 by blocking that gives 24 75 square inches of shear area 16 5 1 5.

With 2 by blocking that gives 24 75 square inches of shear area 16 5 1 5. Unprotected vents can allow embers and hot gases to enter the attic see fact sheet 8 vents. The exception provided in this section goes on to state that roof trusses must also have blocking provided at the ends unless another approved method is provided. Construction studies drawing detail showing how to set up and draw the eaves detail of a roof scale 1 5.

Boral roofing s eave risers elevate the tiles at the eave to the proper height while also blocking the openings at the eave to prevent infestation of birds and vermin. Assume that for venting you need three 2 inch diameter holes spaced equally along the block.