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.,�,� ;. CHAPTER 6 TYPES OF CONSTRUCTION `r SECTION 601 602.4.2 Floor framing.Wood beams and girders shall be of `�� -3. GENERAL sawn or glued-laminated timber and shall be not less than 6 �;r inches (152 mm) nomina] in width and not less than ]0 �� �C.4Qe,The provisions of this chapter shall controi the �nches C254 mm\ nominal ic� depth. Framed sawn or �^�:_��,��,��\oA��..��;��.��- ��e�\��i�o�:.��,�� t. s. line and sUpportfloorloads, sh2�1 be t]o11eSS�t�l B 1I�C��S �� � SECTION 602 (203 mm)nominal in any dimension.Framed timber trusses }. supporting floor loads shall have members of not less than 8 ��; CONSTRUCTION CLASSIFICATION inches(203 mm)nominal in any dimension. � �� :.1 General. Buildings and structures erected or to be 4€ecl,altered or extended in height or area shall be dassified 602.4.3 Roof framing. Wood-frame ar glued-laminated �ne of the tive construction types detined in Sections 602.2 arches for roof construction, which spring from the t7oor "� a�gh 602.5. The building elements shall have a fire-resis- line or from grade and do not support floor loads,shall have `R�' a�rating not less than that specified in Table 601 and exte- members not less than 6 inches(152 mm)nominal in Width �'�_ and have not Iess than S inches �` �lts shall have a fir•e-resistance rating not less than that (203 mm)nominal in�epth � :ified in Tabie 602. far Che lower haif of the height and not less than 6 inches _,�;r. �02.1.1 Minimum requirements. A building or portion (152 mm) nominal in depth for the upper half. Framed ar �f glued- laminated arcbes for roof eonstruction that spring y ��, iereof shall not be required to conform to the details of a from the top of walls or wall abutments, framed timber k g�pe of construction higher than that type,which meets the �' ��„ trusses and other roof framing, which do not support t7oor �inimum requirements based on occupancy even though ]oads,shall have members not less than 4 inches(102 mm) " ��'^ ,. ertain features of such a building actually conform to a nominal in width and not less than 6 inches(152 mm)norni- a�t►er rype of construction. rt�. nal in depth.Spaced members shall be permitted to be com- , �,. 2 Types I and II.Type I and II construction are those types posed of two or more pieces not less than 3 inches(76 mm) �.rt , ';� �nstruction in which the building elements listed in Table nominal in thickness where blocked solidly throughout '�`� are of noncombustible materials, except as permitted in their intervening spaces or where spaces are tightly closed i��n 603 avd elsewhere in this code. by a continuous wood cover plate of not less than 2 inches � 3 Type III.Type III construction is that type of construc- �51 mm) nominal in thickness secured to the underside of "4 in which the exterior walls are of noncombustible materi- �e members.Splice plates shall be not less than 3 inches(76 ind the interior building elements are of any material mm} nominal in thickness. Where protected by approved utted by this code. Fire-retardant-treated wood framing automatic sprinklers under the roof deck,framing members ,; plying with Section 2303.2 shall be permitted within exte- shall be not less than 3 inches(76 mm)nominai in width. tivall assemblies of a 2-hour rating or less. 602.4.4 Floors. Floors shall be without concealed spaces. 4 Type IV.Type IV construction (Heavy Timber, HT) is Wood floors shall be of sawn or glued-laminated planks, t�fpe af construcUon in which the exterior walis are of splined or tongue-and-groove,of not less than 3 inches(76 �ornbustible materials and the interior building elements mm) nominal in thickness covered with 1-inch (25 mm) �f solid or laminated wood without concealed spaces.The nominal dimension tongue-and-groove flooring,laid cross- ;is of Type�N construction shall comply with the provi- wise or diagonally,or 0.5-inch(12.7 mm)particleboard or �� �of this section.Fire-retardant-treated wood framing com- planks not less than 4 inches(102 mm)nominal in width set tg with Section 2303.2 shall be permitted within exterior on edge close together and weli spiked and covered with assemblies with a 2-hour rating or less. Minimum solid 1-inch (25 mm) nominal dimension flooring or 15/az-inch � nominal dimensions are reyuired for structures built ��2 ►nm) vvood struckural pane] or 0.5-inch (12.7 mm) ;Type IV construction(HT). For glued-laminated mem- P��cleboard.The lumber shall be laid so that no continu- � the e uivalent net finished width and de ths corres ous line of oints will occur exce t at oints of su ort. �} q P Pond- � P P PP o the minimum nominal width and depths of solid sawn Floors shall not extend closer than 0.5 inch (12.7 mm) ta `"x �er are required as specified in Tabie 602.4. walls.Such 0.5-inch(12.7 mm)space shall be covered by a :y molding fastened to the wall and so arranged that it will not )2.4.1 Columns. Wood columns shall be sawn or glued obstruct the swelling or shrinkage movements of the floor. minated and shall not be less than 8 inches (203 mm), Corbeling of masonry walls under the floor shail be permit- �minal,in any dimension where supporting floor loads and ted to be used in piace of molding. '` rt less than 6 inches(152 mm)nominal in width and not ss than$ inches (203 mm) nominal in depth where sup- 602.4.5 Roofs.Roofs shall be without concealed spaces and � �rting roof and ceiling loads only. Columns shall be con- wood roof decks shali be sawn or glued laminated,splined �uous or superimposed and connected in an approved or tongue-and-groove plank,not less than 2 inches(51 mm) anner. nominal in thickness, 1'/&inch-thick(32 mm)wood struc- s:,:� INTERNATIONAL BUIIDING CODE� 85