6 so 
 
 3 &~ts 
 
 Technical Division 
 Federal Housing Administration 
 Washington, D. C. 
 
 PLANK FLOOR AND ROOF CONSTRUCTION 
 Technical Circular No. 8 
 October 7, 1940 
 
 The National Lumber Manufacturers 1 Association is sponsor¬ 
 ing nationally a method of floor and roof construction consisting of 
 2" nominal thickness plank nailed over wood beams, spaced up to 7 , -0 ,( 
 o.c. Construction of this type has been carried out in several locali¬ 
 ties during the past year and has been investigated by the Technical 
 Division in conjunction with an analysis of typical details prepared 
 by the Association. 
 
 While the plank and beam system of framing is common in mill 
 construction, heretofore it .has rarely been used for dwellings; conse¬ 
 quently, the builder who is accustomed to stud walls, joist floors, and 
 roof rafters, may find that although the plank and beam system is rela¬ 
 tively simple in principle, in detail it presents several unfamiliar 
 conditions of framing due to the normally greater loads carried by in¬ 
 dividual beams. In a general way, the plank and beam system is not 
 unlike structural steel framing. The walls above first floor are non¬ 
 bearing, the concentrated loads of second floor and roof bays are 
 carried to the foundation through independent column supports, and many 
 of the problems common to structural steel framing are encountered. A 
 full exposition of the method is contained in a booklet published by 
 the National Lumber Manufacturers Association under the title of 11 Plank 
 and Beam Floor and Roof For Residential Construction. 11 
 
 This Technical Circular is intended as a guide for determining 
 the acceptability of this type of construction. It applies specifically 
 to plank floor and roof construction and does not modify the provisions 
 contained in the Minimum Construction Requirements or rulings now in 
 effect which apply to other conventional elements of the structure. 
 
 The paragraphs that follow cover the most important features of the 
 system and should be considered carefully in determining the acceptability 
 of any particular design submitted. 
 
 1. Plank Subfloor and Roof : The planks used for subfloor 
 and roof shall be 2 n x 6" or 2" x 8 ,! and shall be thoroughly seasoned 
 No. 2 Dimension (Common) stodk or better, tongue and groove or splined. 
 
 The planks shall be laid at right angles to the supporting beams and 
 shall be both blind and surfaced nailed. Where practicable, the planks 
 shall be continuous over at least two spans, but where circumstances 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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- 2 - 
 
 require the use of single span planks they shall he distributed so that 
 they do not occur in adjacent positions. Planks which are continuous 
 over two spans or single span planks which are distributed so that they 
 do not occur in adjacent positions may be used on spans not exceeding 7’-0" 
 o.c. Where it is necessary to have single span planks in adjacent positions, 
 the span shall net exceed 6*-0". 
 
 2. Finish Floor ; Finish flooring shall be not less than 13/16" 
 thick and shall be laid at right angles to the plank subfloor over building 
 paper or felt. 
 
 3. Floor Beams ; The floor beams shall be No. 1 Dimension (Com- 
 mon). Where built-up beam sections are used, their laminations shall be se¬ 
 curely nailed together from both exposed faces. Where the laminations are 
 blocked apart to allow the passage of utilities, each lamination shall be 
 securely nailed to 'the blocking. The size and spacing of beams shall be in 
 accordance with the attached table but the spacing shall in no case exceed 
 7 , -0" o.c. Single member beams shall not be less than 3" thick. Floor 
 beams shall not be notched unless additional section is provided. Beams 
 should not bear over exterior wall or partition openings; however, where 
 the plans require such framing, a specially designed header shall be provid¬ 
 ed to carry the load to adjacent posts. 
 
 4. Exterior Wall Framing ; Studs shall not be spaced more than 
 24" o.c. In 2-story construction they shall be cut at the second floor and 
 capped with a plate. Solid blocking or fillers whose depth is equa.1 to 
 that of the second floor beams shall be provided between beams and separated 
 laminations. The studs shall bear on a single plate laid on the plank floor¬ 
 ing which extends to the outside walls. Floor, roof and ceiling beams shall 
 be supported at the exterior wall upon pests which are adequate to support 
 the load, and whose dimensions are not less than 4"x4". The solid or built- 
 up posts shall be squared at both ends to provide full bearing. 
 
 5. Roof Beams ; The roof beams shall be No. 1 Dimension (Common). 
 Where built-up sections occur, their laminations shall be securely nailed 
 together from both exposed faces. The size and spacing of beams shall be 
 in accordance with the attached table, but the spacing shall in no case 
 exceed 7 , -0" o.c. Single member beams shall not be less than 3" thick. 
 
 Where flat roofs are used, the allowable spans of roof beams shall be the 
 same as for floor beams. 
 
 6. Ceiling Beams : Where 2" plank is used for attic floors, the 
 allowable sizes, spans, and spacings for ceiling beams shall be the same 
 as for floor beams. 
 
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- 3 - 
 
 7. Plank Floors with Conventional Roof Framing : Plank and bean 
 floor construction nay be used for the first floor in conjunction with con¬ 
 ventionally framed second floors, roofs or ceilings. Where conventional 
 joist framing is used above first floor, the Minimum Construction Require¬ 
 ments shall apply. 
 
 8. Interior Columns ; The interior columns shall be designed to 
 adequately support their loads, and the column ends shall be squared to 
 provide uniform bearing for the beams. Provision shall be made for adequate 
 bearing under the beam by a suitable column dimension, by notching the 
 column, or by spiking 2 ,f bearing blocks 2* —0 M long to the sides of the col¬ 
 umn. Columns shall not be notched unless extra section is provided. Where 
 beams butt over a column an 8 ,f column dimension parallel to the direction 
 
 of the beams shall be used to provide suitable bearing for the beams. Base¬ 
 ment columns shall have a cross section of at least 6 rr x6 M ; those in other 
 stories shall be at least 4 ,, x4 M . 
 
 9. Detail Drawings ; When used for second floor and roof, this 
 method of construction introduces certain unusual conditions of framing; 
 therefore complete details indicating that provisions have been made for 
 
 all necessary contingencies should be submitted to the local insuring office. 
 Particular attention should be directed to cases where heavy mechanical in¬ 
 stallations are indicated. 
 
 10. Workmanship : Careful workmanship is considered essential to 
 the successful utilization of this method of construction. Any evidence 
 
 of faulty workmanship shall justify non-acceptance unless corrected to the 
 satisfaction of the Chief Architect. 
 
 11. Minimum Construction Requirements : All elements of construc¬ 
 tion not specifically described herein shall comply with the Minimum Con¬ 
 struction Requirements for the district in which the house is erected. 
 
 12. Hurricanes, Earthquakes, etc. : In districts especially sub¬ 
 ject to hurricanes, earthquakes, or other unusually severe climatic condi¬ 
 tions affecting dwelling structures, the Chief Architect may require addi¬ 
 tional safeguards to the proposed design. When such questions occur the 
 specific case should be submitted to the Technical Division for individual 
 consideration. 
 
 Howard P. Vermilya 
 Director 
 
 Technical Division 
 
 33929 
 

 
 
 
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 MAXIMUM ALLOWABLE SPANS POR BEAMS 
 IN PLANK CONSTRUCTION 
 
 MAXIMUM SPANS POR FLOOR BEAMS 
 
 
 
 I 
 
 II 
 
 
 III 
 
 IV 
 
 Nominal 
 
 Size 
 
 Spacing 
 
 Center 
 
 to 
 
 Center 
 
 Douglas Pir 
 S.Y. Pine 
 
 West Coast 
 Tamarack, 
 
 Hemlock 
 
 Spruce 
 
 Western Larch 
 Norway Pine 
 Douglas Pir(Rocky 
 Mt. Region) 
 Eastern Hemlock 
 
 Redwood 
 
 
 4'-0" 
 
 121-8" 
 
 11*~6" 
 
 11»-0" 
 
 101-4" 
 
 
 4*-6" 
 
 lli-ll" 
 
 101-11" 
 
 10»-4" 
 
 9*-9" 
 
 
 5»-0" 
 
 11»-4" 
 
 10*-5" 
 
 91-11" 
 
 9*-4»* 
 
 1-3x10" 
 
 5* -6" 
 
 10*-10" 
 
 9*-ll" 
 
 9i-5" 
 
 81—11" 
 
 
 6'~0" 
 
 101-5" 
 
 91-6" 
 
 91-0" 
 
 81-6" 
 
 
 61-6" 
 
 101-0" 
 
 9 *-2" 
 
 8*-8" 
 
 8 *-2" 
 
 
 7i-0" 
 
 9i-8» 
 
 8*-10" 
 
 8* -4" 
 
 7i-ll" 
 
 
 4*-0" 
 
 14»-0" 
 
 12*-10" 
 
 12»-2" 
 
 111-6" 
 
 
 4*-6" 
 
 13*-3" 
 
 121-1" 
 
 ll*-5" 
 
 10*-9" 
 
 
 5»-0" 
 
 12*-7" 
 
 Hi-6" 
 
 101-11" 
 
 10*-3" 
 
 2-2x10" 
 
 5«-6" 
 
 121-0" 
 
 lli-O" 
 
 10*-5" 
 
 91-10" 
 
 
 61-0" 
 
 ll*-6" 
 
 10*-6" 
 
 10*-0" 
 
 9*-5" 
 
 
 6*-6" 
 
 lli-l" 
 
 10’-2" 
 
 9*-8" 
 
 9*—1" 
 
 
 71-0" 
 
 10*-8" 
 
 91-IO" 
 
 9i-3" 
 
 8*-9" 
 
 
 41-0" 
 
 14 * —9*' 
 
 131-6" 
 
 12'-9" 
 
 12*-1" 
 
 
 41-6I' 
 
 131-11" 
 
 12*-9" 
 
 12»-l n 
 
 111-5" 
 
 
 5*-0" 
 
 131-4" 
 
 12*-2" 
 
 11'-6" 
 
 10*-10" 
 
 1-4x10" 
 
 5*—6" 
 
 12'-9" 
 
 11*—7" 
 
 11 r -0" 
 
 10*-4" 
 
 
 61-0" 
 
 121-2" 
 
 lli-l" 
 
 10'-7" 
 
 9*-11" 
 
 
 6i —6" 
 
 11*—9" 
 
 101-9" 
 
 101-2" 
 
 9i-7" 
 
 
 7 ! -0" 
 
 11»-4" 
 
 101-4" 
 
 9i-10" 
 
 9 *-3" 
 
 
 41-0" 
 
 15*.-6" 
 
 14*-2" 
 
 13*-5" 
 
 121-8" 
 
 
 4*-6" 
 
 141-9" 
 
 13*-5" 
 
 12i-9" 
 
 12*—0" 
 
 2-2x10") 
 
 5*-0" 
 
 14*-0" 
 
 12*—9" 
 
 12'-I" 
 
 ll'-S" 
 
 1-1x10") 
 
 5«-6" 
 
 13*-4" 
 
 12*-2" 
 
 11i-7" 
 
 101-11" 
 
 
 6i-0" 
 
 12*-10" 
 
 ll’-8" 
 
 ll'-l" 
 
 10*-5" 
 
 
 6«-6" 
 
 12*-4" 
 
 Hi-3" 
 
 10*-8" 
 
 10*-0" 
 
 
 7* -0" 
 
 11»-10" 
 
 10*-10" 
 
 10*-4" 
 
 9*—8" 
 
 
 41-O" 
 
 151-11" 
 
 14-1-6" 
 
 131-10" 
 
 131-0" 
 
 
 41-6" 
 
 151-1" 
 
 13*-9" 
 
 13*-1" 
 
 121-3" 
 
 1-2x10") 
 
 5* -0" 
 
 14*-4" 
 
 13*-1" 
 
 12*-5" 
 
 11*-8» 
 
 1-3x10") 
 
 5*-6" 
 
 13*-9" 
 
 12*-6" 
 
 ll'-lO" 
 
 111-2" 
 
 
 6»-0" 
 
 131-2" 
 
 12*t-0" 
 
 11»-4" 
 
 l0*-9" 
 
 
 6i-6" 
 
 121-8" 
 
 ll»-6" 
 
 101-11" 
 
 10*-4" 
 
 
 71 -0" 
 
 12*-2" 
 
 11*-2" 
 
 101-7" 
 
 91-11" 
 

 
 
 
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2 
 
 MAXIMUM SPANS FOR FLOOR BEAMS 
 
 
 
 I 
 
 II 
 
 
 III 
 
 IV 
 
 Nominal 
 
 Size 
 
 Spacing 
 
 Center 
 
 to 
 
 Center 
 
 Douglas Fir 
 S.Y. Pine 
 
 West Coast 
 Tamarack, 
 
 Hemlock 
 
 Spruce 
 
 We stern Larch 
 Norway Pine 
 Douglas Fir(Rocky 
 Mt. Region) 
 Eastern Hemlock 
 
 Redwood 
 
 2-2x12" 
 
 1-4x12" 
 
 1-6x10" 
 
 3-2x10" 
 
 2-2x8" 
 
 4>-0" 
 
 16"—11" 
 
 15*-6" 
 
 14*-7" 
 
 13*-10" 
 
 4*-6" 
 
 16*-0" 
 
 14*-7" 
 
 13*-11" 
 
 13*—1" 
 
 5*-0" 
 
 15’-3" 
 
 13*-10” 
 
 13*-2" 
 
 12*-5" 
 
 5*- 6 " 
 
 14i_6” 
 
 13*-3" 
 
 12’-7" 
 
 11 *- 10 " 
 
 6 «- 0 » 
 
 13*-11” 
 
 12 *—9" 
 
 12 *- 1 " 
 
 11*-4" 
 
 6 «- 6 " 
 
 13»-5" 
 
 12*-3" 
 
 11*-7” 
 
 10 *- 11 " 
 
 7*-0” 
 
 12 *- 11 " 
 
 11 *- 10 " 
 
 11 ’- 2 " 
 
 10*-7" 
 
 4* -0" 
 
 17*-10" 
 
 16*-3" 
 
 15*-4" 
 
 14*-6" 
 
 4*- 6 " 
 
 16*-10" 
 
 15*-4" 
 
 14*-7" 
 
 13*—9" 
 
 5*-0" 
 
 16*-0" 
 
 14*-7" 
 
 13*-10" 
 
 13*—1" 
 
 5*-6" 
 
 15*-3" 
 
 13*-11” 
 
 13*-3" 
 
 12 *- 6 " 
 
 6 * - 0 " 
 
 14*-8" 
 
 13*-4" 
 
 12*-9” 
 
 12 *- 0 " 
 
 6 *- 6 " 
 
 14*-1" 
 
 12 *- 10 " 
 
 12’-3" 
 
 11 *- 6 " 
 
 7'- 6 " 
 
 13*-8" 
 
 12*-5" 
 
 0 
 
 1 — 1 
 
 1 
 
 rH 
 
 1 — ! 
 
 ll'-l" 
 
 4 I -0" 
 
 17*-11” 
 
 16*-5» 
 
 15*-7" 
 
 141 - 9 ” 
 
 4»-6» 
 
 17l-O” 
 
 15*-6" 
 
 14*-9" 
 
 13*-11" 
 
 5*~0” 
 
 16*-3” 
 
 14*-9» 
 
 14’-0" 
 
 13*-3" 
 
 5* - 6 " 
 
 15*-6" 
 
 14*-1" 
 
 13’ -5" 
 
 CO 
 
 —• 
 
 1 
 
 CD 
 
 6 * - 0 " 
 
 14*-10" 
 
 13*-7" 
 
 12 ’- 10 " 
 
 12 *- 2 " 
 
 6 *- 6 " 
 
 14*-3" 
 
 13*-l” 
 
 12*-5" 
 
 11 *— 8 " 
 
 7*-0» 
 
 13*-10" 
 
 12*-7" 
 
 12 *- 0 ” 
 
 11 *—3” 
 
 4 , ~0" 
 
 17*-0" 
 
 15*-6" 
 
 14’-9" 
 
 13*-11" 
 
 4«-6» 
 
 16* — 1 ** 
 
 14*-9" 
 
 13*-11" 
 
 13*-2" 
 
 5* -0" 
 
 15*-4" 
 
 14*-0" 
 
 13*-3" 
 
 12 * -6" 
 
 5*-6" 
 
 14*-7" 
 
 13*-4" 
 
 12 ’- 8 " 
 
 11 *- 11 " 
 
 6 »- 0 » 
 
 14*-0" 
 
 12 *- 10 " 
 
 12 *- 2 " 
 
 11 * -6" 
 
 6 »- 6 " 
 
 13*-6" 
 
 12*-4" 
 
 11 '- 8 " 
 
 11 * -0" 
 
 7*-0” 
 
 13*-0" 
 
 11 *- 11 " 
 
 11*-3" 
 
 10 *- 8 " 
 
 4*-0» 
 
 11 *- 2 " 
 
 10 *- 2 " 
 
 9*-8" 
 
 9* -1" 
 
 4 J - 6 " 
 
 10 *- 6 " 
 
 91 .- 7 " 
 
 9 »-l" 
 
 8«-7" 
 
 5»-0” 
 
 10 * -0" 
 
 9*-2" 
 
 8 *- 8 " 
 
 8 ’- 2 " 
 
 5*- 6 " 
 
 9*-7" 
 
 8 * - 8 " 
 
 8*-3" 
 
 7*- 10 " 
 
 6 «- 0 " 
 
 9*-2" 
 
 8 * - 3" 
 
 7*-ll" 
 
 7*-6" 
 
 6 *- 6 » 
 
 8 *- 10 " 
 
 8 * — 0 " 
 
 7» -7” 
 
 7*—2" 
 
 7*-0” 
 
 8 *- 6 " 
 
 7*-9" 
 
 7’-4" 
 
 6 *-ll" 
 

 
 
 
 
 
 
 
 
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 ‘ 
 
 
 
 
 
 
 
 
 
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MAXIMUM SPANS FOR HOOF BEAMS 
 
 (Span is measured as the horizontal distance 
 from the plate to a point directly 
 Beneath the ridge.) 
 
 
 
 I 
 
 II 
 
 
 III 
 
 IV 
 
 Nominal 
 
 Size 
 
 Spacing 
 
 Center 
 
 to 
 
 Center 
 
 Douglas Fir 
 S.Y. Pine 
 
 West Coast 
 Tamarack, 
 
 Hemlock 
 
 Spruce 
 
 Western Larch 
 Norway Pine 
 Douglas Fir(Rocky 
 Mt. Region) 
 Eastern Hemlock 
 
 Redwood 
 
 
 4*-0" 
 
 10 *- 1 " 
 
 9*-3 il 
 
 8 *-9" 
 
 8 *-3" 
 
 
 4*- 6 " 
 
 9*-7" 
 
 8 * - 8 " 
 
 8»-3" 
 
 7*-10" 
 
 
 5*-O'* 
 
 9 * —1 1 * 
 
 8 *-3" 
 
 7*- 10 " 
 
 7 1 _ 4.11 
 
 2 - 2 x 6 " 
 
 5*- 6 " 
 
 8 i- 8 " 
 
 7*-11" 
 
 7*- 6 " 
 
 7*~0" 
 
 
 6 *- 0 " 
 
 8 *-4" 
 
 7* -7" 
 
 71-211 
 
 6*-9" 
 
 
 6 *- 6 " 
 
 8 1 - 0 " 
 
 7* -3" 
 
 6 *- 11 " 
 
 6 * — 6 " 
 
 
 7*-0" 
 
 7*-8" 
 
 7* -0" 
 
 6 * - 8 " 
 
 6 *-3" 
 
 
 4 T -0" 
 
 13*-4" 
 
 12 *- 2 " 
 
 11*-7" 
 
 10 *- 11 " 
 
 
 4*- 6 " 
 
 12 »- 8 " 
 
 11 *- 6 " 
 
 10 *- 11 " 
 
 10*-4" 
 
 
 5*~0" 
 
 12 *- 0 " 
 
 10 *- 11 " 
 
 10*-4" 
 
 9*-10" 
 
 2 - 2 x 8 " 
 
 5*-6" 
 
 11 *- 6 " 
 
 10 *- 6 " 
 
 10 *- 0 " 
 
 91-411 
 
 
 6 «- 0 " 
 
 ll*- 0 " 
 
 10 *- 0 » 
 
 9*-6" 
 
 9*-0" 
 
 
 6 *- 6 " 
 
 10 1 -7" 
 
 9*-8" 
 
 9* -2" 
 
 8 *- 8 " 
 
 
 71 -O" 
 
 10*-3" 
 
 9*-4" 
 
 8 *- 10 " 
 
 8 *—4" 
 
 
 4* -0" 
 
 15*-2" 
 
 13*-10" 
 
 13*-2" 
 
 12*-5" 
 
 
 4»-6" 
 
 14*-4" 
 
 13*-2" 
 
 12*-5" 
 
 11 *-9" 
 
 
 5*-0" 
 
 13*-8" 
 
 12 »- 6 " 
 
 11 *- 10 " 
 
 n 1 -?." 
 
 1-3x10" 
 
 5*- 6 " 
 
 13*-0" 
 
 11 *- 11 " 
 
 11 *-3" 
 
 10 *-3" 
 
 
 6 *- 0 " 
 
 12 *- 6 " 
 
 11*-5" 
 
 10 *- 10 " 
 
 10 * - 2 " 
 
 
 6 *- 6 " 
 
 12 *- 0 " 
 
 ll*- 0 " 
 
 10*-5" 
 
 9*-10" 
 
 
 7*-0" 
 
 11*-7" 
 
 10*-7" 
 
 10 *- 1 " 
 
 9*~S" 
 
 
 4*~0" 
 
 16*-9" 
 
 15*-3" 
 
 14*-6" 
 
 13*-8" 
 
 
 4*.- 6 " 
 
 15*-10" 
 
 14*-6" 
 
 13*-9" 
 
 12 *- 11 " 
 
 
 5*~D" 
 
 15*-1" 
 
 13*-9" 
 
 13*-1" 
 
 12 *—4" 
 
 2-2x10" 
 
 5*~6" 
 
 14*-5" 
 
 13*-2" 
 
 12 *- 6 " 
 
 11 *- 10 " 
 
 
 6 ** 0 " 
 
 13*~10" 
 
 12 *- 8 " 
 
 12 *- 0 " 
 
 11*-4" 
 
 
 6 *- 6 " 
 
 13*-4" 
 
 12 *- 2 " 
 
 11*-7" 
 
 10 *- 10 " 
 
 
 7*-0" 
 
 12 *- 10 " 
 
 11*-9" 
 
 11 *- 2 " 
 
 10 *- 6 " 
 
 31640 5/8/40 
 
UNIVERSITY OF ILUNOIS-URBANA 
 
 01 
 
 2 050046603