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    • 10. 发明专利
    • Roofing felt marked to indicate batten positioning
    • GB2483104A
    • 2012-02-29
    • GB201014322
    • 2010-08-27
    • O'BRIEN THOMAS
    • O'BRIEN THOMAS
    • E04D12/00E04D15/02
    • A roofing material, which may be roofing felt, comprising a sheet of flexible material having two parallel long sides and two short end edges joining the long sides. The material has pre-printed thereon a plurality of longitudinal guide lines extending parallel to the long sides of the material. The guide lines are equally spaced and arranged in a repeating sequence across the width of the material to form identical groups of a plurality of guide lines. Each guide line of a group is visually distinct from the others in the group. The material further includes a plurality of different indicator markings, one indictor marking corresponding to each group of guide lines to enable each group. A method of roofing using the material comprises the steps of laying the felt across roof rafters with the long side perpendicular to the rafters, noting the grid line and group indicator for the intended position of a first row of battens and securing a row of battens in position.