510 R.I. Code R. 510-RICR-00-00-2.29
Add the following new Appendix AA:
This appendix contains prescriptive solutions for compliance on wind path load transfer requirements and shall be used only within the limitations of section AA101.2.
The prescriptive solutions specified in the following sections shall not be permitted to be used in the following conditions:
The following applies to structures conventionally framed or to truss-type roofs.
Roof sheathing shall be not less than seven sixteenths of one inch (7/16") finished thickness.
Roof attachment shall be accomplished with minimum 8d ring shank nails as follows:
All sheathing edges within the four foot (4') perimeter edge zone shall be blocked with two (2) by three (3) minimum including the ridge line and soffit/fascia area. Provisions for ventilation air shall be maintained.
Exception: Two (2) by three (3) intermediate blocking can be eliminated provided all sheathing is five eighths of one inch (5/8") nominal tongue and groove structural panels.
Ridge straps one and one quarter inch (1 1/4") x twenty (20) gage shall be attached to each pair of opposing rafters with 5-8d nails at each end into the framing member.
Exceptions:
Overhangs shall be limited to twenty-four inches (24"). Ladder style rake overhangs attached to the gable end walls shall be limited to twelve inches (12"). Cantilevered rake overhangs at gable end walls shall be limited to twenty-four inches (24").
See section R802.11.
Exception: Roof truss to wall connection shall be designed to withstand either the load requirements of Table R802.11 or the connection loads indicated on the truss design shop drawings, whichever is greater.
Wall sheathing shall be a minimum seven sixteenths of one inch (7/16") structural panel. Nailing shall be in accordance with Table R602.3 (1) and the following:
At the top plate or plates, the sheathing shall extend from the top of the top plate to a minimum of sixteen inches (16") beyond the stud-to-bottom of the top plate connection. A minimum of four (4) nails shall be used at each stud fastening, and edge-nailed to each plate at six inches (6") o/c.
Alternate: prefabricated and pre-engineered connection straps approved by the Building Official.
If the studs are not continuous to the foundation plate such as at an intermediate floor, the wall sheathing shall be continuous and uninterrupted for a distance of sixteen inches (16") beyond from top of bottom wall plate to sixteen inches (16") beyond bottom of bottom wall top plate below, with a minimum of four (4) nails at each stud, and field-nailed at six inches (6") o/c to floor joist header framing.
Alternate: Prefabricated and pre-engineered connection anchors or fasteners approved by the Building Official.
At the bottom of the wall assembly to the foundation sill plate, the wall sheathing shall be continuous from a point sixteen inches (16") above the top of the bottom wall plate to the bottom of the foundation sill, with a minimum of four (4) nails at each stud, six inches (6") field nailed, and edge nailed to the foundation sill plate at six inches (6") o/c.
Alternate: Prefabricated pre-engineered connection anchors or fasteners approved by the Building Official.
A four foot (4') segment of wall sheathing shall be designated as a shear wall at each corner of the structure at each floor, and no more than twenty-four feet (24') apart along a wall length. The following additional requirements apply:
Exception: Window openings are allowed no closer than two feet (2') to corner providing the length of that shear panel is increased to eight feet (8').
First (1st) story shear walls shall be connected to the foundation below with connection anchoring capable of three thousand five hundred (3,500) lb. hold-down capacity, in addition to conventional foundation anchor bolt requirements in the remainder of the panel. The hold downs shall be fastened to each end of the shear wall at the double stud.
Exceptions
Anchor bolts shall be installed in accordance with section R403.1.6 and the following:
1 + 2 story buildings | 1/2" @ 48" o/c or | 5/8" @ 72" o/c |
3 story building | 1/2" @ 24" o/c or | 5/8" @ 36" o/c |
Alternate
Prefabricated and pre-engineered connections in design and quantity sufficient to equal strength of anchor bolt specification above.
Exception.
See Exception #2 to AA 203.2.1 above.
For wind zone 2 (one hundred ten (110) mph) and zone 3 (one hundred twenty (120) mph) the following conditions apply:
Exterior bearing and non-bearing walls greater than ten feet (10') in height shall be two (2) by six (6) at sixteen inches (16") o/c min.
Walls with a total height greater than ten feet (10') shall be permitted to use two (2) by four (4) at sixteen inches (16") o/c providing the wall is limited to ten feet (10') in length and the individual studs are not greater than nine feet (9') in length.
In wind zone 3 (one hundred twenty (120) mph) garage doors shall be limited to nine feet (9') by eight feet (8') nominal.
Deviations from the above prescriptive requirements shall only be permitted if stamped calculations and drawings are provided by a Rhode Island registered professional engineer for alternative connections.
510 R.I. Code R. 510-RICR-00-00-2.29