Effect of temperature on the tensile strength of roofing felt seams

Jouko Rantamäki

Research output: Book/ReportReport


As fewer bituminous felt layers are currently used in roofing, the role of seams in the overall durability of the roof is becoming more prominent. The tensile strength of seams is examined here by means of tests performed at different temperatures under laboratory conditions using both aged and non aged specimens. SBS-modified and glass-fibre felts were used. The results indicate that shear fractures in the glass-fibre felt usually developed at the seams, in addition to which seam strength was found to decrease most at low temperatures by comparison with the seamless test sample. The seam of a SBS- modified felt did not constitute its weakest point, and fracturing usually took place elsewhere.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages22
ISBN (Print)951-38-4141-3
Publication statusPublished - 1992
MoE publication typeNot Eligible

Publication series

SeriesVTT Tiedotteita - Meddelanden - Research Notes


  • temperature
  • tensile strength
  • roofing
  • roofs
  • coatings
  • coating processes
  • life (durability)
  • damage
  • aging tests (materials)
  • comparison
  • felts
  • seams (joints)
  • layers
  • durability
  • service-life
  • tests
  • shearing
  • fractures (materials)
  • low temperatures
  • dynamic loads


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