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Homeowner Forum / Construction / April 2005Should I use cedar shingle for a 4 in 12 roof?
I am building an 8 x 20 porch onto my house which has a 4 in 12 slope roof. I would like to use cedar wood shingle on the roof. I believe this is the minimum slope for which cedar shingle is recommended. I also am putting several skylights in, Velux models with the step flashing used for ashphalt shingle. Is this a good idea, or should I go to asphalt or metal? I like the look of wood shingle much better. I plan to use ice & water shield under whatever I use. Also, I am doing things myself, and have experience with shingle but not installing metal roofs. The problem is the flashing for the skylights and metal roof could be too complicated for me. But I am not sure if skylights and wood shingle is asking for trouble on a 4 in 12 roof. Thanks, -- Jeff dynamo...@hotmail.com wrote: > I am building an 8 x 20 porch onto my house which has a > 4 in 12 slope roof. [quoted text clipped - 13 lines] > But I am not sure if skylights and wood shingle is asking for > trouble on a 4 in 12 roof. Thanks, I should have answered this post first. If you're not familiar with bending up metal flashing, it might not be worth your time to learn how to do it on the job. One leak and all your "savings" go out the window. The 4/12 wood shingles with Ice & Water Shield over the whole roof would work. Lower slope wood roofs won't have the longevity of a steeper roof, but it's probably not a major concern. What's the existing roofing on the main house? R NO. Many codes outlaw cedar shakes as fire hazard (being used in the past as siding on mansard construction; pitch 12'/12". Goes up like a matchbox) 4/12 is recommended for asphalt. Any less usually requires double layer felts. Research SMACNA for flashing recommendations. > dynamo...@hotmail.com wrote: > > [quoted text clipped - 28 lines] > > R > NO. Many codes outlaw cedar shakes as fire hazard (being used in the past > as siding on mansard construction; pitch 12'/12". Goes up like a matchbox) > 4/12 is recommended for asphalt. Any less usually requires double layer > felts. > Research SMACNA for flashing recommendations. That's a pretty emphatic no, but you're taking a guess at his code, aren't you? Jeff, I believe you're in MA - this link takes you to the MA Building Code page on roof coverings: http://www.mass.gov/bbrs/780CMR_Ch3609.pdf Wood shakes and shingles are allowed as per the code, with specific installation requirements, and a minimum allowable pitch of 3/12 over 15# building paper (I wouldn't go that low - your 4/12 over Ice & Water Shield is far better). This from the first page: "3609.1.3 Roofing covering materials: Roofs shall be covered with materials as set forth in 780 CMR 3609.3 through 3609.9. Classified roofing shall conform to UL 790, as listed in Appendix A, and shall be installed when the edge of the roof is less than three feet (914 mm) from a property line or as required by city or town ordinance or bylaw." Appendix A covers NFPA codes. I know in parts of CA a wood roof is required to have a sprinkler system. I doubt that's the case in MA, but check to be sure. R ... > Appendix A covers NFPA codes. I know in parts of CA a wood roof is > required to have a sprinkler system. I doubt that's the case in MA, > but check to be sure. Also, unless the rest of the house is wood shingle, you may want to just check w/ your insurance agent to see what, if any, premium is/will be charged for wood roof in your jurisdiction. > ... > > Appendix A covers NFPA codes. I know in parts of CA a wood roof is [quoted text clipped - 4 lines] > check w/ your insurance agent to see what, if any, premium is/will be > charged for wood roof in your jurisdiction. http://www.cedarbureau.org/faqs/pressure.htm http://www.watkinsawmills.com/certi.htm Shouldn't be a factor. R > > ... > > > Appendix A covers NFPA codes. I know in parts of CA a wood roof is [quoted text clipped - 11 lines] > > Shouldn't be a factor. OP has made no reference to using fire-resistant shingles... > > > ... > > > > Appendix A covers NFPA codes. I know in parts of CA a wood roof is [quoted text clipped - 13 lines] > > OP has made no reference to using fire-resistant shingles... Possibly because he is not aware of them. He was asking a generic question about using cedar shingles, then people starting jumping on the idea in regards to fire safety. Fire safety is not an issue - there are options. I was merely pointing that out. R ... > Possibly because he is not aware of them. He was asking a generic > question about using cedar shingles, then people starting jumping on > the idea in regards to fire safety. Fire safety is not an issue - > there are options. I was merely pointing that out. Quite possibly he doesn't...I apparently mistook your point of emphasis, also. I figured he might as well check before he goes ahead and later gets a surprise. |
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