Jones, Rudard A.

Percival, Donald H.

English

Illinois Digital Environment for Access to Learning and Scholarship Repository

NAIL-GLUING OF ROOF TRUSSES, FRAMES AND OTHER STRUCTURAL COMPONENTSNAIL-GLUE FOR STRENGTH AND ECONOMY•  Nail-gluing makes possible roof trusses, frames, and other structural components which are very stiff and strong. A glued joint holds two members firmly without slippage.•  In  nail-gluing, the adhesive is applied to the structural members and nails or staples are used only to give rigidity to the unit during handling and stacking and to provide pressure while the glue sets. The strength of the finished connection is entirely dependent on the glue bond. Moisture content of lumber for the trusses and frames must be 19% or less.•  The casein glue must meet Federal Specification MMM-A-125, Type I or II. (Type I I  contains a mold inhibitor.) Mix the glue according to the manufacturer’s instructions. Protect the units from rain. After nailing, stack and do not handle again during the curing period.•  Fabricate and cure the units above 50° F. The lumber and plywood likewise should not be below 50° F for nail-gluing. When the tem perature is between 50° F and 70° F, a 16-hour minimum curing period is necessary; when the tem perature is 70° F or above an 8-hour minimum curing period is needed.•  Nail-gluing should* be used only with properly engineered designs. Use designs presented in the Illinois-Purdue instruction sheets for nail-glued trusses and roof-frames.*• Design of Nail-Glued Plywood Gusset Plates, Purdue University Agricultural Experiment Station, Bulletin 613, 1954, Lafayette, Indiana.Instruction Sheets, University of Illinois Small Homes Council-Build ing Research Council, Urbana, III. (50<t each)# 2  —  2/12 Nail-G lued “ W "  Roof Truss # 3  —  3/12 Nail-G lued ‘‘W '.’ Roof Truss # 4  —  4/12 Nail-G lued - "W ” Roof Truss # 5  —  Long-Sp.an Nail-G lued " W ” Roof Truss # 6  —  2 "  x 4 "  Nail-G lued King-Post Roof Truss# 7  —  2 "  x 6 "  Nail-G lued King-Post Roof Truss # 8  —  Sloped Ceiling, Plywood W eb Roof-Frames # 9  —  Plywood W eb Roof-Frame, 1/12 Slope # 1 0  —  Hip-Roof Nail-G lued Trusses# 1 2  —  Reselection of Lumber for Roof Trusses# 1 3  —  Variations for Building Nail-G lued “ W "  Roof Truss# 2 1  — Nail-G lued Header for W all Panels# 2 2  —  Nail-G lued Headers for Larger OpeningsMIX GLUECasein glue is recommended. The glue must meet Federal Specifications MMM-A-125, Type I or Type II . (Type I I  contains a mold inhibitor which is required by some local authorities.) The glue must be mixed according to the m anufacturer’s instructions. Thin or watery mixtures must be avoided.LAY OUT STRUCTURAL COMPONENTLay out on a flat, sturdy surface (jig, subfloor or slab —  not the ground) the truss, roof- frame or other component to be built. The units being constructed should be protected against rain  and allowed to cure at temperatures above 50° F.Do not use second-hand or dirty lumber.APPLY GLUEApply glue directly to the lumber members by means of a paint roller, glue brush or mechanical glue spreader. Paint Roller Glue BrushCorrect ApplicationUSE PLENTY OF GLUEUse plenty of glue on the structural members to cover the entire area of contact. Glue need not be spread on gusset plates. A correct spread of glue on the wood will look like that shown below.A glue spread which is too thin, such as shown in second photograph, will not give adequate glue bond.A more than adequate glue spread, also illustrated, will result in a good glue bond but the practice is wasteful.Inadequate Application Wasteful ApplicationFor information and specifications for mechanical spreader, use “ A  Spreader for Use in Structural N a il-G lu in g ," Stanley K. Suddarth, Purdue University, Agricultural Experiment Station Circular 408, 1954, Lafayette, Indiana.:f ' - ^f  •: 'z -r ’ ; — - *JJ '  ? :. ‘ : - f f  JIPs #Iif§§r4  fr K  i  z *If l?f§* * J F V  mH JbPUT PLYWOOD IN POSITIONAfter the glue has been applied to the lumber members, place the ply­wood in position on the glue area and fasten.FASTEN PLYWOODNail or staple plywood preferably by means of a mechanical fastening device. Drive fasteners hard so that their heads are buried in the plywood. Solid- wood splice plates must be nailed manually with common wire nails.Mechanical Fastening•y $V'4i j a * MmImYM : aSSf1,Types of Fasteners Used For plywood gussets 4-d Nails Type “A ” Type “B”Nail Heads Buried in PlywoodIT1j .For solid splice platesVTi .Ull6-d Nails8 FASTEN ACCORDING TO PATTERNFor members 1 %" wide use one row of fasteners spaced 4" apart. For members 3Va" wide, use two rows of fasteners spaced 4" apart. For members 5W ' wide use two rows of fasteners spaced 4" apart and stagger a third row down the center of the member.JUDGE GLUE JOINT BY SQUEEZE-OUTWhen two members are fastened together, some of the glue will be squeezed out if the correct am ount of glue has been used. This is visual certification of a good glue joint.NAIL-GLUING OF ROOF TRUSSES, FRAMES AND OTHER STRUCTURAL COMPONENTSINSTRUCTION SHEET #1DONALD H. PERCIVALW ood  TechnologistSMALL HOMES COUNCIL-BUILDING RESEARCH COUNCIL UNIVERSITY OF ILLINOIS, URBANA, ILLINOISRUDARD A. JONESRegistered ArchitectRevised edition of an instruction sheet prepared in 19 5 5 by Hans Granum, Norw egian  Building Research Institute, a  Fulbright Scholar at the University of Illinois; and  Byron M . Radcliffe and  Stanley K. Suddarth of the Purdue University W ood Research Laboratory.Copyright, 1960, by the U N IVERS ITY  O F  ILL IN O IS. A ll rights reserved. N o  part of this material may be repro­duced in any form without perm ission in writing from the publishers.Endorsement by the U N IVERS ITY  O F  IL L IN O IS  SM ALL H O M E S  C O U N C IL -B U IL D IN G  RESEARCH C O U N C IL  of any manufactured product shall not be claimed on the basis of this publication.Responsibility for employment of the method described in this publication shall rest with the user of the sheet and in nowise on the University of Illinois or Purdue University. W hen  variations from the method described are incorporated by the user, the roof trusses, frames, or other structural components so built shall not be represented as having built from a design  developed at Purdue University or the University of Illinois.Price: 50 cents

Nail-Gluing of Roof Trusses, Frames and Other Structural Components

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Nail-Gluing of Roof Trusses, Frames and Other Structural Components

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