SPS 327.28(2)(f)1.1. Siding and sheathing in contact with concrete, masonry, or earth and within 6 inches above final exterior grade.
SPS 327.28(2)(f)2.
2. Siding and sheathing in contact with concrete or masonry and within 2 inches above an impervious surface.
SPS 327.28(2)(g)
(g) Ends of wood structural members and their shims resting on or supported in masonry or concrete walls and having clearances of less than 1/2 inch on the top, sides, and ends.
SPS 327.28(2)(h)
(h) Bottom plates or sole plates of walls that rest on concrete or masonry and that are below exterior grade or less than 8 inches above final exterior grade.
SPS 327.28(2)(i)
(i) Columns in direct contact with concrete or masonry unless supported by a structural pedestal or plinth block at least one inch above the floor.
SPS 327.28(2)(j)
(j) Any structural part of an outdoor deck, including the decking.
SPS 327.28(3)
(3) Wood girders that rest directly on exterior concrete or masonry shall be protected by one of the following methods:
SPS 327.28(3)(a)
(a) The wood shall be pressure treated with preservative or shall be a naturally durable and decay-resistant species.
SPS 327.28(3)(b)
(b) Material, such as pressure-treated plywood, flashing material, steel shims, or water-resistant membrane material shall be placed between the wood and the concrete or masonry.
SPS 327.28(4)
(4) All pressure-treated wood and plywood shall be identified by a quality mark or certificate of inspection of an approved inspection agency which maintains continued supervision, testing, and inspection over the quality of the product.
SPS 327.28 Note
Note: Heartwood of redwood, cypress, black walnut, catalpa, chestnut, sage orange, red mulberry, white oak, or cedar lumber are considered by the department to be naturally decay-resistant. Heartwood of bald cypress, redwood, and eastern red cedar are considered by the department to be naturally termite resistant.
SPS 327.28(5)(a)(a) Fasteners for pressure-preservative treated wood and fire-retardant-treated wood shall meet one of the following requirements:
SPS 327.28(5)(a)1.
1. The fastener is a steel bolt with a diameter of 1/2 inch or greater.
SPS 327.28(5)(a)3.
3. The fastener is made of hot-dipped, zinc-galvanized steel with the coating weight and thickness labeled as complying with ASTM A 153.
SPS 327.28(5)(a)4.
4. The fastener is made of steel with a mechanically-deposited zinc coating labeled as complying with ASTM B 695, Class 55 or greater.
SPS 327.28(5)(a)5.
5. The fastener has coating types and weights in accordance with the fastener manufacturer's recommendations. In the absence of the manufacturer's recommendations
subd. 1.,
2.,
3., or
4. shall apply.
SPS 327.28 Note
Note: “Zinc plated," “zinc coated," “chrome plated," etc., fasteners do not necessarily comply with either of these standards.
SPS 327.28(5)(b)
(b) When a fastener is used with a hanger or other metal fixture, the fastener shall be of the same material as the hanger or metal fixture.
SPS 327.28 Note
Note: When separate pieces are in close contact, zinc corrodes rapidly in the presence of plain steel. Zinc corrodes much more rapidly in the presence of stainless steel.
SPS 327.28(5)(c)
(c) For the purposes of this section, a fastener includes nails, screws, and bolts with nuts and washers.
SPS 327.28 History
History: EmR1703: emerg. cr., eff. 2-6-17;
CR 17-017: cr.
Register March 2018 No. 747, eff. 4-1-18.
SPS 327.29
SPS 327.29 Floor design. Floors shall support all dead loads plus the minimum unit live loads as set forth in
s. SPS 327.20. The live loads shall be applied to act vertically and uniformly to each square foot of horizontal floor area.
SPS 327.29 History
History: EmR1703: emerg. cr., eff. 2-6-17;
CR 17-017: cr.
Register March 2018 No. 747, eff. 4-1-18.
SPS 327.30
SPS 327.30 Wood floors in contact with the ground. Wood floors in contact with the ground shall be designed and constructed in accordance with the wood-foundation standards adopted in Table 327.19-2.
SPS 327.30 History
History: EmR1703: emerg. cr., eff. 2-6-17;
CR 17-017: cr.
Register March 2018 No. 747, eff. 4-1-18.
SPS 327.31
SPS 327.31 Wood frame floors. Unless designed through structural analysis, wood frame floors shall comply with the following requirements:
SPS 327.31(1)(b)
(b) Where the joists of a floor system are parallel to, and located between bearing walls above and below, the joists shall be doubled.
SPS 327.31(2)
(2) Floor trusses. Metal plate connected wood floor trusses shall be designed in accordance with the Design Specifications for Metal Plate Connected Parallel Chord Wood Trusses and the National Design Specification for Wood Construction. Truss members shall not be cut, bored or notched.
SPS 327.31(3)(a)(a) Wood girders and beams shall be fitted at the post or column. Adjoining ends shall be fastened to each other to transfer horizontal loads across the joint. Beams shall also be fastened to the posts with framing anchors, angle clips, or equivalent.
SPS 327.31(3)(b)
(b) Where intermediate beams are used, they shall rest on top of the girders; or shall be supported by ledgers or blocks fastened to the sides of the girders; or they may be supported by approved metal hangers into which the ends of the beams shall be fitted.
SPS 327.31(3)(c)
(c) Lateral restraint for all wood beams shall be provided at all columns using a saddle or other approved connection where the beam meets one of the following conditions:
SPS 327.31 Note
Note: A saddle supports the beam on the bottom and allows for the through-connection of fasteners into the side of the beam.
SPS 327.31(4)(a)1.1. `Joists.' Wood joists made of sawn lumber shall meet the following bearing requirements:
SPS 327.31(4)(a)1.a.
a. Wood joists supported on wood or metal shall have a bearing surface of at least 1 1/2-inches measured from the end of the joist.
SPS 327.31(4)(a)1.b.
b. The tail end of a floor joist may not extend past the edge of a beam by more than the depth of the floor joist.
SPS 327.31(4)(a)1.c.
c. Wood floor joists with ends that intersect over a beam shall have the ends overlap at least 3 inches and be securely fastened together with at least two 12d common nails or the ends shall be butt-jointed or face-jointed and fastened with ties, straps, plates or solid blocking.
SPS 327.31(4)(a)2.
2. `Beams and girders.' Beams and girders made of sawn lumber shall have a bearing surface on their supports of at least 3 inches parallel to the beam or girder and be at least as wide as the beam or girder.
SPS 327.31(4)(b)
(b)
Engineered wood products. Bearing surface for engineered wood products shall be in accordance with the manufacturer's instructions provided those instructions were developed through structural analysis or product testing and are applicable to the configuration.
SPS 327.31(5)
(5) Notching and boring. Notching and boring of beams or girders is prohibited unless determined through structural analysis.
SPS 327.31(5)(a)1.1. Notches located in the top or bottom of floor joists shall not have a depth exceeding 1/6 the depth of the joist, shall not have a length exceeding 1/3 the joist depth nor be located in the middle 1/3 of the span of the joist.
SPS 327.31(5)(a)2.
2. Where floor joists are notched on the ends, the notch shall not exceed 1/4 the depth of the joist. Notches over supports may extend the full bearing width of the support.
SPS 327.31(5)(b)1.1. `General.' A hole may not be bored in a floor joist within 2 inches of a notch or another hole. In no case shall the distance between adjacent holes be less than the diameter of the larger hole.
SPS 327.31(5)(b)2.
2. `Holes near the edge.' Holes bored in the top or bottom 2 inches of a joist shall follow the limitations for notching under
par. (a).
SPS 327.31(5)(b)3.
3. `Other holes.' Holes bored in floor joists that are not within 2 inches of the top or bottom of the joist shall have their diameter limited to 1/3 the depth of the joist.
SPS 327.31(5)(c)
(c)
Engineered wood products. Notching or boring of engineered wood products shall be done in accordance with the manufacturer's instructions provided those instructions were developed through structural analysis or product testing.
SPS 327.31(6)(a)(a)
General. Except as provided in
pars. (b) and
(c), a floor joist overhang shall be cantilevered beyond the outer edge of the supporting wall below it by no more than the actual depth of the joist or shall be designed through structural analysis in accordance with
s. SPS 327.20 (3).
SPS 327.31(6)(b)
(b)
Joist overhangs parallel to the main floor framing system. Joist overhangs that are extensions of, and parallel to, the main floor framing system may extend beyond the depth of the joist without structural analysis provided they meet all of the following conditions:
SPS 327.31(6)(b)1.
1. The overhang is cantilevered no more than 2 feet beyond the outer edge of the supporting wall below it.
SPS 327.31(6)(b)2.a.a. The overhang supports a uniform load limited to the weight of the bearing wall and the tributary roof area above it.
SPS 327.31(6)(b)2.b.
b. The tributary length of the roof area, excluding the eave overhang, is no more than 2 feet greater than the actual length of the joist directly below.
SPS 327.31 Note
Note: The tributary length is usually half the span of the joist or rafter.
SPS 327.31(6)(b)3.
3. The joist overhang does not support any concentrated loads. For the purposes of this subsection, a framed opening in the wall with a rough opening of 4 feet or less shall be considered uniform loading.
SPS 327.31(6)(b)4.b.
b. The doubled joist length extends inward beyond the inner edge of the supporting wall by the same distance as the cantilever.
SPS 327.31(6)(c)
(c)
Joist overhangs perpendicular to the main floor framing system. Joist overhangs that are perpendicular to the main floor framing system, or lookout joists, may extend beyond the depth of the joist without structural analysis provided they meet all of the following conditions:
SPS 327.31(6)(c)1.
1. The joist overhang is cantilevered no more than 2 feet beyond the outer edge of the supporting wall below it.
SPS 327.31(6)(c)2.b.
b. The double floor joist is located a distance of at least 2 times the cantilever length inward from the outer edge of the supporting wall below.
SPS 327.31(6)(c)3.
3. The joist overhang supports no more than either a non-bearing wall or a wall that supports only a roof which spans no more than the floor overhang cantilever length plus the eave overhang.
SPS 327.31(6)(d)
(d)
Other joist overhangs. All overhangs longer than the depth of the supporting joist that do not meet all of the conditions under
par. (b) or
(c) shall be designed through structural analysis.
SPS 327.31(7)
(7) Floor openings. Trimmers and headers shall be doubled when the span of the header exceeds 4 feet. Headers which span more than 6 feet shall have the ends supported by joist hangers or framing anchors, unless the ends are supported on a partition or beam. Joists more than 8 feet long that frame into headers shall be supported on metal framing anchors or on ledger strips of at least 2 inches by 2 inches nominal.
SPS 327.31(8)(a)(a)
Plywood sheathing. Plywood sheathing used for floors shall be limited to the allowable loads and spans shown in Table 327.31-A.
SPS 327.31(8)(b)
(b)
Combination subfloor-underlayment. Combination subfloor-underlayment shall be installed in accordance with Table 327.31-B.
SPS 327.31(8)(c)
(c)
Floor boards. Where wood boards are used for floor sheathing, the boards shall comply with the minimum thicknesses shown in Table 327.31-C.
SPS 327.31(8)(d)
(d)
Planks. Planks shall be tongue and groove or splined and at least 2 inches, nominal, in thickness. Planks shall terminate over beams unless the joints are end matched. The planks shall be laid so that no continuous line of joints will occur except at points of support. Planks shall be nailed to each beam.
SPS 327.31(9)(a)(a)
Sawn lumber. Bridging shall be provided for sawn lumber framing at intervals not exceeding 8 feet where the nominal depth to thickness ratio is greater than 4 to 1.
SPS 327.31 Note
Note: This 4:1 ratio means bridging is required for wood-framed floors having nominal 2X10 or deeper solid-sawn-lumber joists, to provide restraint against rotation or lateral displacement.
