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  • R905. 2. 2 - ICC Digital Codes
    For roof slopes from two units vertical in 12 units horizontal (2:12) up to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905 1 1 The performance of all roof coverings is based in part on the slope of the roof surface
  • TAB-R-127 Shingle Application On Low Slopes 2:12 To 4:12 - GAF
    For slopes of 2” up to but not including 4” per foot, a double layer of roof deck protection is required GAF recommends: Shingle-Mate®, RoofPro™, TigerPaw™, Deck Armor™ Roof Deck Protection or #15 or #30 felt Why The Extra Steps? It’s simple… lower slopes make it harder for a shingle roof to “shed” water and this extra
  • Roofing Felt Requirements Underlayment Code - InspectAPedia
    On roof slopes of 2 12 to 4 12 the remainder of the roof shall be two layers of 15# felt (applied in shingle fashion), or 1 layer of ice dam protection On 4 12 or greater slopes, the balance of the roof shall be one layer of 15# felt
  • How Many Layers Of Underlayment Do I Need For A 2-12 Roof? - HPD CONSULT
    Two layers of underlayment are required for roofs with a slope of 4:12 down to 2:12, also known as low-slope roofs The first layer of underlayment should be installed before the start of cold weather, while the second layer can be installed either before or after the start of cold weather
  • Understanding underlayment | Professional Roofing magazine
    For asphalt shingle roofs with slopes between 2:12 and 4:14, IBC 2021 and IRC 2021 require a two-layer underlayment application The underlayment is required to be applied as a 19-inch-wide starter parallel to and starting along the eaves
  • TECHNICAL BULLETIN Steep Slope R - asphaltroofing. org
    single layer of self-adhering underlayment on slopes of 2:12 up to 4:12 • Underlayment helps keep the deck dry until shingles are applied, minimizing problems that may result if shingles are placed on wet decks
  • 00674 00 fm p00i-xii - iccsafe. org
    However, if they are installed on roofs with a slope between 2:12 and 4:12, two layers of underlayment are required The double layer of underlayment must be overlapped a minimum of nineteen inches and fastened to roof sufficiently to hold it in place before the shingles are installed
  • ASPHALT SHINGLE ROOF REQUIREMENTS - Lake Saint Louis
    For roof slopes from 2 units vertical in 12 units horizontal (2:12), up to 4 units vertical in 12 units horizontal (4:12), underlayment shall be two layers applied in the following manner: apply a 19- inch strip of underlayment felt parallel to and starting at the eaves
  • Guidelines for asphalt shingle roofing - Minnesota Department of Labor . . .
    There are two options available for re-roofing installations One would be to tear of the old roof before applying the new one The second would be to lay new shingles over the existing roof Roofing materials are heavy, so muliple layers can afect the ability of a roof to hold the weight of winter snow An overlay can be the less expensive option
  • Mastering Roof Inspections: Underlayment, Part 2 - InterNACHI
    In low-slope conditions -- that is, from 2:12 up to 4:12 -- felt courses should overlap a minimum of 19 inches This will provide a double layer of underlayment across the entire roof The photo above shows what a low-slope installation looks like





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