-40%
Beam Computer Span Western Wood Joist Rafter Loading criteria Ice Dam Protection
Beam Computer Span Western Wood Joist Rafter Loading criteria Ice Dam Protection
Beam Computer Span Western Wood Joist Rafter Loading criteria Ice Dam Protection
Beam Computer Span Western Wood Joist Rafter Loading criteria Ice Dam Protection
Beam Computer Span Western Wood Joist Rafter Loading criteria Ice Dam Protection

Beam Computer Span Western Wood Joist Rafter Loading criteria Ice Dam Protection

$ 4.22

Availability: 100 in stock
  • Brand: Perrygraf
  • Condition: Used
  • Model: Slide paper calculator
  • Modified Item: No
  • All returns accepted: ReturnsNotAccepted

    Description

    Two different simple paper computers. First one -
    Beam Computer to measure Joist and Rafter Loading and Deflection Criteria, Span Computer. It was given out by Western Wood Products Association Yeon Building Portland Oregon.  It's approx 9" x 4".  At the bottom, 1971 PerryGraf.  Second one is WinterGuard Ice Dam Protection Calculator, CertainTeed, dated 1986. It figures the amount of WinterGuard to be applied according to the roof pitch.
    Buyer to pay shipping of .50