DESIGN CRITERIA FOR ROOF WASHDOWN SYSTEM. PHASE 1. FALLOUT REMOVAL STUDIES ON TYPICAL ROOFING SURFACES FOR TWO SIZE RANGES OF PARTICLES (177350 MICRONS AND 350-590 MICRONS)

Abstract

Fallout simulant particles ranging in size from 177 to 350 and 350 to 590 microns were deposited on selected typical roof sections 48 ft long by 8 ft wide to determine the effect of water flow rate, slope, and surface type on washdown effectiveness. More than 90% of the simulant can be removed on composition shingles, aluminum shingles and roll roofing at slopes of 1:12 or steeper with 2 to 3 gallons of water per min per ft of roof width (gpm/ft). It was found that washdown is ineffective on tar and gravel roofing without prior removal of the loose gravel. Washdown on a fiberglass epoxy laminated roof will remove better than 99% of the simulant particles with a water flow rate as low as 1 gal/min/ft.

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Document Details

Document Type
Technical Report
Publication Date
Jul 18, 1963
Accession Number
AD0424591

Entities

People

  • Graham G. Brown
  • N. J. Vella
  • R. H. Heiskell
  • W. S. Kehrer

Organizations

  • Naval Radiological Defense Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Counter WMD
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aluminum
  • Civil Defense
  • Civil Engineering
  • Construction
  • Engineering
  • Epoxy Resins
  • Fiberglass
  • Filtration
  • Flow Rate
  • Laminates
  • Masonite
  • Materials
  • Particle Size
  • Particles
  • Resins
  • Standards
  • Water Flow

Readers

  • Aerosol Science/Aerosol Physics
  • Explosive Engineering.