Wall covering termination under R327.3.3.1

Where Oregon R327 is adopted, the covering on the exterior wall has to run the full height. R327.3.3.1 starts at the top of the foundation and ends at the roof. At an open overhang it dies into 2-inch nominal solid wood blocking between rafters. At an enclosed eave or soffit, it dies at the underside of the enclosure (amendment PDF). Stopping the siding at the window head is not that section.

You are on a ladder at the wall-to-eave joint. The inspector is looking for a stop. Open tails want blocking between rafters. A boxed soffit wants the wall covering to hit the underside of that box.

The wall-bottom drawing (DET-016) is not published yet. Read the code sentence. Do not use a house-level hub graphic as the detail.

Why it matters

Embers and heat collect at the roof-to-wall line. If the covering stops short, you have a raw band of framing or sheathing under the overhang. R327.3.3 still requires a wall path. R327.3.3.1 is how far that covering has to go. The two sections travel together.

How the sentence works

R327.3.3 is the wall menu. Noncombustible, ignition-resistant, heavy timber, log, or an ASTM E2707 assembly. Type X behind the cladding is a deemed-to-comply exception. See Type X behind the covering.

R327.3.3.1 is extent, not the menu. One sentence, two stops:

“From the top of the foundation to the roof” is the run. A wainscot that dies at four feet is not that run.

The paths

1. Open Craftsman tails. Covering climbs to the soffit line and dies into 2-inch blocking between rafters from the wall top plate toward the roof sheathing. The underside of the tails still needs an R327.3.4.1 path. See Craftsman eaves. Fascia is exempt. See the fascia finding.

2. Boxed soffit. Covering terminates at the underside of the enclosure. The soffit has its own numbered underside path. Type X on the soffit is one of those paths. It is not a substitute for running the wall covering to that plane.

3. Height. The 12-foot eave exceptions live in R327.3.4.1 and R327.3.2.1. They are not a skip of R327.3.3.1. See the 12-foot rule.

4. California. CWUIC is a different book. Do not import Oregon’s 2-inch blocking sentence onto a California sheet without reading Chapter 5.

What people mix up

• Stopping siding at the frieze and calling the eave “trim.”
• Wrapping fascia because the wall covering has to terminate.
• Treating Type X on the soffit as the wall-covering stop. You still hit the underside of the enclosure.
• Writing a six-inch noncombustible base onto R327.3.3.1. That number is not in this sentence.
• Treating the 12-foot eave exception as a wall-covering exception.

How to check

1. Read the adopted code for the lot. If R327 is not adopted, this sentence does not bind.
2. Look at the eave. Open or boxed.
3. Open tails: find 2-inch nominal blocking between rafters at the overhang. Confirm the covering reaches it.
4. Boxed: confirm the wall covering hits the underside of the enclosure, not a gap below the soffit panel.
5. Confirm the wall still has an R327.3.3 path, not only a termination detail.
6. Put the termination on the drawings. A “per code” note is not a stop.

Limits

This page does not spec the wall covering product. It does not spec fasteners at the blocking. It does not decide what Bend or Deschutes will stamp. DET-016 is not published. FireApproved is not the AHJ.

Related records

• Siding, eaves
• Type X behind the covering
• Craftsman eaves under R327
• The 12-foot rule
• Fascia exemption