Page 962 - 2018_IRC

APPENDIX S

AS106.10 Support of plaster skins. Plaster skins on straw- 2. Assembly shall be the width of the strawbale wall
bale structural walls shall be continuously supported along and shall comply with Section AS106.11.
their bottom edge. Acceptable supports include: a concrete or 3. Discontinuous lumber shall be spliced with a metal
masonry stem wall, a concrete slab-on-grade, a wood-framed strap with not less than a 500-pound (2224 N) allow-
floor in accordance with Figure AS105.1(2) and an approved able wind or seismic load tension capacity. Where
engineered design or a steel angle anchored with an approved the wall line includes a braced wall panel the strap
engineered design. A weep screed as described in Section shall have not less than a 2,000-pound (8896 N)
R702.7.2.1 is not an acceptable support. capacity.
AS106.11 Transfer of loads to and from plaster skins. 4. Panel joints shall be blocked.
Where plastered strawbale walls are used to support superim-
posed vertical loads, such loads shall be transferred to the 5. Roof and ceiling framing shall be attached to the
plaster skins by continuous direct bearing in accordance with roof-bearing assembly in accordance with Table
Figure AS105.1(3) or by an approved engineered design. R602.3(1), Items 2 and 6.
Where plastered strawbale walls are used to resist in-plane 6. Where the roof-bearing assembly spans wall open-
lateral loads, such loads shall be transferred to the reinforcing ings, it shall comply with Section AS106.12.3.1
mesh from the structural member or assembly above in accor- AS106.12.3.1 Roof-bearing assembly spanning
dance with Figure AS105.1(3) or AS105.1(4) and to the sill openings. Roof-bearing assemblies that span openings
plate in accordance with Figure AS105.1(1) or AS105.1(2) in strawbale walls shall comply with the following at
and with Table AS106.13(1).
each opening:
AS106.12 Load-bearing walls. Bearing capacities for plas- 1. Lumber on each side of the assembly shall be of
tered strawbale walls used as load-bearing walls in one-story the dimensions and quantity required to span
buildings to support vertical loads imposed in accordance with each opening in accordance with Table
Section R301 shall be in accordance with Table AS106.12.
R602.7(1).
AS106.12.1 Precompression of load-bearing strawbale 2. The required lumber in the assembly shall be sup-
walls. Prior to application of plaster, walls designed to be ported at each side of the opening by the number
load-bearing shall be precompressed by a uniform load of of jack studs required by Table R602.7(1), or
not less than 100 plf (1459 N/m).
shall shall extend beyond the opening on both
AS106.12.2 Concentrated loads. Concentrated loads sides a distance, D, using the following formula:
shall be distributed by structural elements capable of dis- D = S  R/2 / (1-R) (Equation AS-1)
tributing the loads to the bearing wall within the allowable
bearing capacity listed in Table AS106.12 for the plaster where:
type used. D = Minimum distance (in feet) for required
spanning lumber to extend beyond the
AS106.12.3 Roof-bearing assembly. Roof-bearing
assemblies shall be of nominal 2-inch by 6-inch (51 mm opening
by 152 mm) lumber with / -inch (12 mm) plywood or S = Span in feet
15
32
OSB panels fastened with 8d nails at 6 inches (152 mm) R = B / B
L
C
on center in accordance with Figure AS105.1(3) and Items B = Design load on the wall (in pounds per
1 through 6, or be of an approved engineered design. L lineal foot) in accordance with Sections
1. Assembly shall be a box assembly on the top course R301.4 and R301.6
of bales, with the panels horizontal. B = Allowable bearing capacity of the wall in
C
accordance with Table AS106.12
TABLE AS106.12
ALLOWABLE SUPERIMPOSED VERTICAL LOADS (LBS/FOOT) FOR PLASTERED LOAD-BEARING STRAWBALE WALLS
PLASTER a ALLOWABLE
WALL DESIGNATION (both sides) Minimum MESH b STAPLES c BEARING CAPACITY d
thickness in inches each side (plf)
A C l a y 1 1 / 2 None required None required 400
B Soil-cement 1 Required Required 800
C L i m e 7 / 8 Required Required 500
7
D Cement-lime / 8 Required Required 800
E Cement / 8 Required Required 800
7
For SI: 1 inch = 25.4mm, 1 pound per foot = 14.5939 N/m.
a. Plasters shall conform to Sections AS104.4.3 through AS104.4.8, AS106.7 and AS106.10.
b. Any metal mesh allowed by this appendix and installed in accordance with Section AS106.9.
c. In accordance with Section AS106.9.2, except as required to transfer roof loads to the plaster skins in accordance with Section AS106.11.
d. For walls with a different plaster on each side, the lower value shall be used.

2018 INTERNATIONAL RESIDENTIAL CODE ® 937
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