International Association of Certified Home Inspectors
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| Exterior Contains discussions about the exterior portion of a home inspection. This includes roofs, gutters, downspouts, decks, patios, windows, et cetera. |
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#1
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Please post questions on this thread on the following subjects:
1. roof sheathing 2. underlayment 3. flashing 4. comp shingles, roll roofing, concrete & clay tiles, slate and metal roofing. Kenton Shepard, InterNACHI member # 04082383 Certified Master Inspector (CMI) EXPERT WITNESS Director of Green Building Director for International Development (303) 717-8940 (303) 258-8289 |
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#2
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Should there be underlayment for wood shingles or shakes
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#3
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Wood shingles should have underlayment.
Wood shakes require an interlayment of 18-inch wide felt. "Interlayment" differs from "underlayment" in that a layer of interlayment is installed with each new course of shakes.
Kenton Shepard, InterNACHI member # 04082383 Certified Master Inspector (CMI) EXPERT WITNESS Director of Green Building Director for International Development (303) 717-8940 (303) 258-8289 |
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#4
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Have you heard about the roof sheathing that requires no underlayment for roof coverings?
Cyr Home and Commercial Property Inspections IAC2 Certified NACHI04070211 http://co.nachi.org/inachiawards Commercial Builder CertainTeed Master Shingle Applicator Shingle Technology Ouellet Associaties Inc. http://www.oaconstruction.com/ |
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#5
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Quote:
No really... what is it? Kenton Shepard, InterNACHI member # 04082383 Certified Master Inspector (CMI) EXPERT WITNESS Director of Green Building Director for International Development (303) 717-8940 (303) 258-8289 |
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#6
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That was funny
The Zip System http://www.huberwood.com/main.aspx?p...emroofOverview It is starting to be used in this area a little. I have seen it twice. Also the same system for wall sheathing, but cannot be interchanged. I have not found out the price yet. But will next week. Marcel Cyr Home and Commercial Property Inspections IAC2 Certified NACHI04070211 http://co.nachi.org/inachiawards Commercial Builder CertainTeed Master Shingle Applicator Shingle Technology Ouellet Associaties Inc. http://www.oaconstruction.com/ |
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#7
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Thanks Marcel!
Kenton Shepard, InterNACHI member # 04082383 Certified Master Inspector (CMI) EXPERT WITNESS Director of Green Building Director for International Development (303) 717-8940 (303) 258-8289 |
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#8
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Please Note:
relliott is a non-member guest and is in no way affiliated with InterNACHI or its members.
Please explain what you look for in the way of flashing for a deck when modified bitumen and also with EPDM.
What type precautions are needed? |
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#9
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Robert, I'm working on the ashpalt shingle section right now. I should be able to answer this when I start the flat roof section.
Kenton Shepard, InterNACHI member # 04082383 Certified Master Inspector (CMI) EXPERT WITNESS Director of Green Building Director for International Development (303) 717-8940 (303) 258-8289 |
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#10
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Are plywood clips still in use and under what conditions?
Does the back stamp go facing up or down? Is the maximum allowable O.C. spacing the same for OSB as it is for plywood? Why is it necessary to stagger sheets? What is the nailing pattern when utilizing 8d nails on 1/2" CDX? How far should sheathing be kept from a 'B' vent flue for a hot water heater? How many courses of ice & water shield are needed at the starter course? Is the ice shield applied over or under the drip edge? Rake edge? Do I have to use step flashing where a roof meets a sidewall? Can't it be a continuous strip? Can I install shingles in the rain? How many inches should roof sheathing be cut back at the ridge when utilizing continuous ridge vent? I'm assuming you are preparing a roofing tutorial. Hope these questions help. I've got more. Keith R. Braun, Western New York Chapter Vice President for Education |
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#11
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Yes, they are still used, but whether or not they're required is a call for the engineer or architect.
The stamp goes up or down depending on which side on will be visible after construction is complete (if that's possible). Both sides are the same as far as their durability. Building inspectors used to like the stamp installed up so they could see the stamp as they walked the roof to inspect nailing. If sheathing is installed stamp down at homes with attic spaces, the stamp will always be visible for inspectors wanting to confirm that the sheathing installed had the proper rating. Building inspectors don't fail roofs because the stamp faced the wrong direction and the IRC doesn't specify which direction the stamp must face (R803). Quote:
For a detailed paper by the APA on this subject, search their "Publications" page for tt-047 Aligning sheathing butt joints from the bottom of the roof to the top creates an overall roof sheathing membrane that is weaker than one in which the butt joints are bridged every other course by a full sheet of sheathing. Typically, 6 inches on the ends/edges and 12" in the field (middle of the sheet.) With certain designs, the engineer may call for decreased nail spacing along the edges, but decreasing nail spacing in the field makes little difference in the performance of the sheathing. Quote:
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Bad idea. Wet underlayment can cause eventual blistering of asphalt shingles. Asphalt shingles are both nailed to the sheathing and bonded to each other by the adhesive strip, so installing in the rain may create problems with differential expansion/contraction as materials gain and lose moisture. Moisture will cause underlayment to wrinkle. If wrinkling is extreme enough it may cause deformation of the shingles. Quote:
Great questions Keith, ask away! Kenton Shepard, InterNACHI member # 04082383 Certified Master Inspector (CMI) EXPERT WITNESS Director of Green Building Director for International Development (303) 717-8940 (303) 258-8289 Last edited by kshepard; 1/15/09 at 6:32 PM.. |
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#12
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Can asphalt shingles be installed over wood shakes/shingles or should they be removed.
Bobby Hamilton Bloodhound Home Investigations Youngstown Home Inspection Boardman Ohio Home Inspection Youngstown Home Inspector Providing home inspections and state licensed termite inspections in the Youngstown and Northeast Ohio areas.
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#13
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Quote:
Due to many areas of poor support of the new shingles, it will shorten their lifespan and make them more vulnerable to impact damage from things like hail, or abrasion from foot traffic. Kenton Shepard, InterNACHI member # 04082383 Certified Master Inspector (CMI) EXPERT WITNESS Director of Green Building Director for International Development (303) 717-8940 (303) 258-8289 Last edited by kshepard; 1/14/09 at 6:25 PM.. |
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#14
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Kenton,
I've come to learn that re-roofing over an existing layer of composition shingles, while generally permitted by code, reduces the ability of the newer shingles to resist impact damage from hail. Therefore, in hail-prone regions the insurance industry recommends and local code may require that re-roofing should include removal of the existing layer(s) of old composition shingle roofing. Correct? BEN GROMICKO Director of InterNACHI Online Education President of NACHI.TV - Online Training Videos President of Mountain Warranty Corporation ben@nachi.tv (303)862-2611 ben@mountainwarranty.com IMPROVE YOUR REPORT |
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#15
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Here's one:
What's the difference between using 15# or 30# felt, where each one should be used and why? Bobby Hamilton Bloodhound Home Investigations Youngstown Home Inspection Boardman Ohio Home Inspection Youngstown Home Inspector Providing home inspections and state licensed termite inspections in the Youngstown and Northeast Ohio areas.
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