Is there a pitch limit for roll roofing?

Question

I would think as long as there is some pitch, roll would be OK, but is there building code rules that say no?

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Michael Durbin · Answer

hi marc hope this answers your question roll roofing is always ok and its actually supposed to be used when there is a little pitch when there is no pitch roll roofing is also required but it has to be smooth no granulated torch or hot work must be a Peal in stick base and cap smooth then when you get to pitch roofs only up to a 3 12 pitch could you roll horizontally any thing great from 4 12 to 8 12 must be rolled vertically or as what some people call strapped any thing greater then 8 12 must either be 6 nailed shingle and felt strapped or standing seam metal

Christopher Christie · Answer

Marc, see industry standards for roofing, also depending on the actual location of the roll roofing i would try to avoid using it. it's a band aid..

1.Layers of Roofing:  The maximum number of layers of roofing is one (1) with Asphalt Shingles in Moderate or Severe Hail Prone Areas such as Colorado.  When one (1) or more layers of roofing exist, all layers of roofing must be removed prior to the installation of a new roof.

2.Existing Decking:  New decking overlay is required for asphalt shingles if old existing decking is made of lumber which is larger than 1” x 6” pieces of lumber or if the gaps between the boards are more than 1/8”.

3.Minimum Slope:  The minimum slope is 4:12 for standard single ply underlayment installation.  For slopes above 2:12 and less than 4:12 an underlayment of two (2) plies (lapped 19") of  ASTM D 226 or D 4869 Type I or II  underlayment (commonly referred to as15# or 30# base felt) or equal is required.  Other approved equal underlayments that are ASTM numbered may be used as long as they are also applied in the same two ply fashion.

4.Primary Step Flashing: Primary Step Flashing must be properly laced with each and every course of shingles.

5.Metal Drip Edge:  A metal drip edge is required at both rake edges and eaves with Asphalt Shingles.

6.Number of Fasteners:  A Minimum of six (6) fasteners are required for all strip type shingles.  (Some shingles require 8 nails for higher wind areas.  See manufacturer’s specifications.)

7.Location of Fasteners:  Corrosion resistant fasteners shall be located per manufacturer’s instructions and not placed in factory applied adhesive.  Nails must also penetrate both parts of a laminated shingle.  Check manufacturer’s specifications and association manuals for the correct placement of nails across the length of the shingle.

8.Over Driven Fasteners:  Fasteners that have been over driven require the sealing of the over driven fastener head and adding a new properly placed and driven fastener.

9.Mansard Roof Shingle Fastening:  Mansard roof applications also require the butts of all asphalt shingles to be hand sealed down in addition to six nails for each shingle per the Asphalt Manufacturer's Association Manual.

Ryan Siverhus · Answer

Depends where you live, codes very from state to state.