40 Ft Attic Truss

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  1. 40 Foot Span Truss

About 32 by 60, 12 foot ceiling on the ground floor, 12/12 roof, attic floor rated at 100 PSF for. Trusses were 2' OC, bottom chord. Looked to be doubled 2x12. 6 foot knee wall upstairs, about 20 by 60 feet clear space. Probably more. Heavy-duty than you need, but around here a 40 foot. Barn truss is not unusual. Even seen ones as long. Truss capacity is listed by pounds per square foot based on the following load rating criteria: Top chord live load (snow and other temporary loads), top chord dead load (roofing materials, weight of the truss itself & other permanent items attached to the roof), bottom chord live load (storage) and bottom chord dead load (insulation, ceiling.

Build the trusses now because the empty floor will be part of your temporary truss jig.

Plus the floor makes a nice clean work space to cut and organize the pieces on.

Calculate number of pieces to cut

See table 3 for the truss count. Take the number under the column of the center spacing (16 O.C. Or 24 O.C.) you want to use.

That truss count number less 1 times 6 ( count-1×6=total ) is the number of OSB web pieces you’ll need to cut.

Take the same truss count number times 4 for the number of 2×4 truss pieces you’ll need to cut.

Cut OSB web pieces

Rip some OSB into strips 12in wide and 8ft long. Cut these strips into pieces 6in long. You’ll need enough of these 6×12 pieces to build the number of OSB web pieces you calculated above. Leave them square at this time.

Attic

Cut truss pieces

See table 2 to get dimensions “G” and “H”.

All the truss pieces are identical. Cut the necessary number of truss pieces with 22 1/2 degree angles on each end and a length of “H” along the long side.

Temporary truss jig

Build a temporary truss jig by screwing 2 long 2×4’s to adjacent edges of the floor at 90 degrees to each other.

Align them to the edges of the floor and attach with 3 to 4 screws along their length. This way the floor acts as a giant builders square.

Cut 3 stops

Cut 3 OSB pieces about 1 1/2in x 3in to use as stops.

Attach stops


From the inside corner of the jig measure up a distance of 1/2 “G” and place a mark on the inside face of the 2×4. Attach the first stop here with two 2in drywall screws.

Attach the second stop the same 1/2 “G” distance along the bottom of the jig.

Attach the third stop at distance “G” from the inside corner.

Mark and cut OSB web pieces

Place 2 truss pieces between the 1/2 “G” stops. Put the ends firmly into the stops and bring the top ends together.

Place a 6×12 piece of OSB under the joint where the ends meet. Make sure it’s symmetrical.

40 Foot Span Truss

Mark along the top of both truss pieces with a pencil then remove the OSB piece.

Cut along these lines and use this piece as a template to mark and cut the rest of the OSB web pieces.

Assemble half trusses

Build all the half truss assemblies by placing truss pieces in the jig and attaching the OSB web with 6 to 8 (1 3/4in) nails or screws into each side. You can use glue or construction adhesive for extra strength.

Do this to the first side only this point.

Before you remove the first truss place a pencil mark on the floor at the outside edge of the joint. If all further trusses match up to this mark then you know the trusses will the same. If they don’t line up then you might have a problem and need to redo something.

Combine half trusses

Place 2 half trusses between the “G” stop and the inside corner and bring the ends together.

Attach an OSB web piece at the joint. Dejando a un lado lo que es de nino seamands pdf online.

Mark the outside of this joint on the floor to use as a check for the rest of the trusses.

Attach OSB web pieces on other side

Gently lift this truss at the center joint and pull it across the floor slightly beyond the upper 1/2 “G” stop. Raise the truss up on its ends and flip it over to the other side. Place an OSB spacer under each end then attach an OSB web piece to each of the 3 joints.

Except the last 2 trusses

Do this for all except the last 2 trusses. Leave the OSB webbing off the back side of the last 2 because these will be the gambrel end trusses that you will nail the siding to.

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40 Ft Attic Truss
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  • You don’t have to decide what size plans to buy because you get all 21/31/45 sizes
  • These plans have been written in great detail specifically for you – the first time shed builder
  • 1.5:12 roof pitch
  • 2, 4-6, 12 inch overhang options
  • 45 sizes from 4×4 to 12×20
  • 4 height options from 60 inches to 12 ft
  • Any custom length, width or height
  • Single and double doors
  • Floor studs 16 inch O.C.
  • Wall studs 16 inch O.C.
  • Rafters 16 inch O.C.
  • Single top plates
  • Instructions and details to build a porch
  • Bike shed ideas
  • Frame for pre hung doors and windows
  • 3:12, 4:12, 5:12 roof pitch options
  • 2, 3 1/2, 5 1/2 inch overhang
  • 21 sizes from 8×4 to 12×20
  • Single and double doors
  • Single top plates
  • Wall studs and roof trusses 24 inch O.C.
  • One of the cheapest and easiest to build
    • Attic
    Includes 3:12, 6:12 & 12:12 roof pitches with full 12 inch overhang
  • 3:12, 6:12 and 12:12 roof pitch options
  • 12 inch overhang
  • 31 sizes from 8×4 to 16×32
  • 8, 10, 12, 14 & 16 ft widths
  • Single and double doors
  • Floor studs 12 inch O.C.
  • Wall studs 16 inch O.C.
  • Roof trusses 16 inch O.C.
  • Double top plates
  • Includes 48 inch loft the length of the shed with an optional gable end door
  • Frame for pre hung doors and windows
  • Gambrel style barn roof
  • 12 inch overhang (option)
  • 31 sizes from 8×4 to 16×32
  • 8, 10, 12, 14 & 16 ft widths
  • Crows Beak (option)
  • Single and double doors
  • Floor studs 12 inch O.C.
  • Wall studs 16 inch O.C.
  • Roof trusses 16
    or 24 inch O.C.
  • Double top plates
  • Includes full width loft
  • Frame for pre hung doors and windows

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