What year (and month if you have it) did renailing the decking with 8D nails go into effect?
Does all new residential construction use straps/wraps that wrap over the truss or are clips still in use for that purpose?
What year did adding a** third nail **become common on clips?
When you have a 100% hip roof, do you still provide a perimeter measurement?
Thanks!
8d nails in 2007, not sure of month.
Don’t know about new construction. I would imagine that they do use wraps, or clips, but I just look when I am at the house.
Not sure about the three nail question.
Sometimes I provide a measurement, sometimes not.
Hope that helps a little.
The nailing requirement were regional(before 2001) in the sense of different municipalities could enforce the renailing depending on location(hvhz). Don’t forget, nothing prevents the AHJ from going above the code, and they can only change the requirements of chapter 1. In south Florida, the renialing of roof decks was required at differnet intervals and would be specified with the roofing permit application. For the correct answer, you’ll need to contact the AHJ for any roofing system installed prior to 3/1/2001. After that you could locate the requirements as listed below:
2001:
[size=2][FONT=Arial]SECTION 1521 HIGH VELOCITY HURRICANE ZONES REROOFING
[FONT=Times New Roman][size=2][FONT=Times New Roman][size=2]**1521.5 **
[/size][/size][/FONT][FONT=Times New Roman][size=2]A roofing system shall not be applied over an existing[/size][/FONT]
[size=2][FONT=Times New Roman]**roof or over an existing roof deck where the roof sheathing ****has not been fastened in compliance with this code or where ****the roof sheathing will not permit effective fastening or ****where sheathing is water soaked or deteriorated so that effective ****attachment is not possible. All areas of deteriorated ****sheathing shall be removed and replaced. The building official ****shall not be required to inspect the renailing of the **sheathing under this section.
The nailing requirement was pretty much the same for roofing systems outside of the HVHZ as the deck was required to meet minimum standards during reroofing.
2004 gave us the Residential Code, things changed in the wording(remember, the roof deck is part of the roofing system per definition):
Chapter 44‚ Section R4402.10‚ (4)
R4402.10.4 </B>
Not more than 25 percent of the total roof area or roof section of any existing building or structure shall be repaired, replaced or recovered in any 12-month period unless the entire existing roofing system or roof section is replaced to conform to requirements of this code.
Chapter 44‚ Section R4402.10‚ (5)
R4402.10.5 </B>
A roofing system shall not be applied over an existing roof or over an existing roof deck where the roof sheathing has not been fastened in compliance with this code or where the roof sheathing will not permit effective fastening or where sheathing is water soaked or deteriorated so that effective attachment is not possible. All areas of deteriorated sheathing shall be removed and replaced. The building official shall not be required to inspect the renailing of the sheathing under this section.
In 2007 they changed the requirement to be more specific, most likely due to the vagueness of the previous wording, and move it to the Existing Building Code. It’s pretty much been the same since then.[/size]
611.7.1 Roof decking attachment for site-built single-family residential structures.</B> For site-built single-family residential structures the fastening shall be in accordance with Section 611.7.1.1 or 611.7.1.2 as appropriate for the existing construction. 8d nails shall be a minimum of 0.131 inch (3.3 mm) in diameter and shall be a minimum of 21/4-inch (57 mm) long to qualify for the provisions of this section for existing nails regardless of head shape or head diameter. [/FONT]
[size=2][FONT=Times New Roman]611.7.1.1 Roof decking consisting of sawn lumber or wood planks up to 12 inches (305 mm) wide and secured with at least two nails (minimum size 8d) to each roof framing member it crosses shall be deemed to be sufficiently connected. Sawn lumber or wood plank decking secured with smaller fasteners than 8d nails or with fewer than two nails (minimum size 8d) to each framing member it crosses shall be deemed sufficiently connected if fasteners are added such that two clipped head, round head or ring shank nails (minimum size 8d) are in place on each framing member it crosses.
611.7.1.2 For roof decking consisting of wood structural panels, fasteners and spacing required in columns 3 and 4 of Table 611.7.1.2 are deemed to comply with the requirements of Section 606.3 of this code for the indicated design wind speed range. Wood structural panel connections retrofitted with a two-part urethane-based closed cell adhesive sprayed onto the joint between the sheathing and framing members are deemed to comply with the requirements of Section 606.3 of this code, provided testing using the manufacturer’s recommended application on panels connected with 6d smooth shank nails at no more than a 6-inch edge (152 mm) and 12-inch (305 mm) field spacing demonstrate an uplift resistance of a minimum of 200 psf (9576 Pa).
Supplemental fasteners as required by Table 611.7.1.2 shall be 8d ring shank nails with round heads and the following minimum dimensions:1. 0.113 inch (2.9 mm) nominal shank diameter.
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Since we are talking about wind mitigations, here’s one that will really twist your brain…8D nails aren’t required to meet the specifications of section #3 B & C of the OIR-1802 form. And here’s where it gets tricky, the listed qualifications of attachment for resistant to uplift are compliant with SSTD-10, Palm Beach County adopted the requirements for construction applicable to SSTD-10 in 1994(equivalent to the SFBC) yet do not receive credit on the OIR-1802 form unless the structure is built after 3/1/2001 as it is located outside of the HVHZ when it comes to “structure”. The form isn’t worth the paper it’s written on…when it comes to the deck attachment, you won’t know if the structure is compliant with the minimum listed uplift of B & C unless you check the prints or contact the Architect/Engineer. The most common misconception is that if the structure has 6D nails used to attach the roof sheathing that it only meets the requirements of A, and that is false.
[/FONT][/FONT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=SymbolMT][FONT=TimesNewRomanPSMT]A. Plywood/Oriented strand board (OSB) roof sheathing attached to the roof truss/rafter (spaced a maximum of 24” inches o.c.) [FONT=TimesNewRomanPSMT]by staples or 6d nails spaced at 6” along the edge and 12” in the field. -OR- Batten decking supporting wood shakes or wood [FONT=TimesNewRomanPSMT]shingles. -OR- Any system of screws, nails, adhesives, other deck fastening system or truss/rafter spacing that has an equivalent [FONT=TimesNewRomanPSMT]mean uplift less than that required for Options B or C below.
[/FONT][/FONT][/FONT][/FONT][/FONT][/FONT][/FONT]
[FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=SymbolMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=SymbolMT][FONT=TimesNewRomanPSMT]B. Plywood/OSB roof sheathing with a minimum thickness of 7/16”inch attached to the roof truss/rafter (spaced a maximum of [FONT=TimesNewRomanPSMT]24”inches o.c.) by 8d common nails spaced a maximum of 12” inches in the field.-OR- Any system of screws, nails, adhesives, [FONT=TimesNewRomanPSMT]other deck fastening system or truss/rafter spacing that is shown to have an equivalent or greater resistance 8d nails spaced a [FONT=TimesNewRomanPSMT]maximum of 12 inches in the field or has a mean uplift resistance of at least 103 psf.
[/FONT][/FONT][/FONT][/FONT][/FONT][/FONT][/FONT][/FONT][/FONT][/FONT][/FONT][/FONT]
[FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=SymbolMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=SymbolMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=TimesNewRomanPSMT][FONT=SymbolMT][FONT=TimesNewRomanPSMT]C. Plywood/OSB roof sheathing with a minimum thickness of 7/16”inch attached to the roof truss/rafter (spaced a maximum of [FONT=TimesNewRomanPSMT]24”inches o.c.) by 8d common nails spaced a maximum of 6” inches in the field. -OR- Dimensional lumber/Tongue & Groove [FONT=TimesNewRomanPSMT]decking with a minimum of 2 nails per board (or 1 nail per board if each board is equal to or less than 6 inches in width). OR Any system of screws, nails, adhesives, other deck fastening system or truss/rafter spacing that is shown to have an equivalent or greater resistance than 8d common nails spaced a maximum of 6 inches in the field or has a mean uplift resistance of at least 182 psf
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Roof Sheathing Nailing Schedules vs. Minimum Code Requirements
[FONT=Arial,Arial][size=3]When using the RMS 11.0 modeling tool to estimate the cost of replacing an existing roof in Florida, the use has one of 4 options. These options include; 6d nails – Any Nail Schedule, 8d Nails – Minimum Nail Schedule, 8d Nails – High Wind Nail Schedule, and 10d Nails – High Wind Nail Schedule. Specifically, it is our understanding that these options represent the roof sheathing nailing schedules and uplift options that one can select from.
Therefore, in an effort to map or correlate these options with historical standards and/or building codes, we have reviewed Florida specific provisions going back to the [/size][/FONT][FONT=Arial,Arial][size=3]1994 SBCCI [/size][/FONT][FONT=Arial,Arial][size=3]and offer the following. It should be noted however that there is not an exact (1 to 1) correlation between the RMS text and the text found within the historical standards and/or building codes. While the RMS text reflects that information found within the tables of the respective codes, variation resulted from footnotes and subsequent passages that served to further qualify or restrict the fastening patterns. When a correlation could not be established we worked to estimate an equivalency standard based on net uplift pressure / capacity requirements. [/size][/FONT]
[FONT=Arial,Arial][size=3]**[size=3]6d nails – Any Nail Schedule **[/size]
**[size=3]RMS 11.0 Text: [FONT=Arial,Arial][FONT=Arial,Arial][size=3]Use this option for plywood/oriented strand board (OSB) roof sheathing attached to the roof truss/rafter (spaced a maximum of 24" o.c.) by staples or 6d nails spaced at 6" along the edge and 12" in the field or any system of screws, nails, adhesives, other deck fastening system or truss/rafter spacing that has an equivalent mean uplift resistance of 55 psf, (Uniform Mitigation Verification Inspection Form, OIR-B1-1802). [/size][/size][/FONT]
**Building Code Text: **[FONT=Arial,Arial][size=3]This text matches the requirement that was in effect in the [/size][/FONT]**1994 Standard Building Code **[FONT=Arial,Arial][size=3]([/size][/FONT][FONT=Arial,Arial][size=3]Table 2306.1 - Fastening Schedule[/size][/FONT][FONT=Arial,Arial][size=3]) for roof sheathing ½" or less in thickness. However, 8d nails had to be used for panels 19/32" or greater in thickness.
[/size][/FONT]**NOTE: **[FONT=Arial,Arial][size=3]It should be noted that at this point in time staples were still allowed. For panels 5/16" – ½" thick spacing was 4" o.c. and 8" o.c. respectively. For panels 19/32" – ¾" thick the spacing was 2" o.c. and 5" o.c. edge and field respectively.
[/size][/FONT]**8d Nails – Minimum Nail Schedule **
**RMS 11.0 Text: [FONT=Arial,Arial][size=3]This option applies to plywood/OSB roof sheathing with a minimum thickness of 7/16" attached to the roof truss/rafter (spaced a maximum of 24" o.c.) by 8d common nails spaced 6" along the edge and 12" in the field or any system of screws, nails, adhesives, other deck fastening system or truss/rafter spacing that has an equivalent mean uplift resistance of 103 psf, (Uniform Mitigation Verification Inspection Form, OIR-B1-1802). [/size][/FONT]
*[FONT=Arial,Arial][size=3][size=3]Building Code Text: **[FONT=Arial,Arial][FONT=Arial,Arial][size=3]This text matches the requirement that was in effect in the [/size][/size][/size][/FONT]**2001 Florida Building Code **[FONT=Arial,Arial][size=3]([/size][/FONT][FONT=Arial,Arial][size=3]Table 2306.1 – Fastening Schedule[/size][/FONT][FONT=Arial,Arial][size=3]). [/size][/FONT][/FONT][/FONT]*[FONT=Arial,Arial][size=3][FONT=Arial,Arial][size=3]
NOTE: **[FONT=Arial,Arial][size=3]It should be noted that the use of 8d common nails became the minimum for roof sheathing in the 1999 Standard Building Code ([/size][/size][/size][/FONT][FONT=Arial,Arial][size=3]Table 2306.1 Fastening Schedule[/size][/FONT][FONT=Arial,Arial][size=3]). The spacing was the same as 1994 and staples could still be used but the staple length requirements were increased. However, Florida never adopted the 1999 Standard Building Code and instead incorporated these requirements into the minimum requirements of the 2001 Florida Building Code Table 2306.1. [/size][/FONT]
*8d Nails – High Wind Nail Schedule ***
RMS 11.0 Text: [FONT=Arial,Arial][size=3]Plywood/OSB roof sheathing with a minimum thickness of 7/16" attached to the roof truss/rafter (spaced a maximum of 24" o.c.) by 8d common nails spaced 6" along the edge and 6" in the field or any system of screws, nails, adhesives, other deck fastening system or truss/rafter spacing that has an equivalent mean uplift resistance of 182 psf, (Uniform Mitigation Verification Inspection Form, OIR-B1-1802). [/size][/FONT]
**Building Code Text (Building Code): **[FONT=Arial,Arial][size=3]This text matches the requirement that was in effect in the [/size][/FONT]**2004 Florida Building Code – Building **[FONT=Arial,Arial][size=3]([/size][/FONT][FONT=Arial,Arial][size=3]Table 2304.9.1 Fastening Schedule[/size][/FONT][FONT=Arial,Arial][size=3]). The [/size][/FONT]**2007 Florida Building Code – Building **[FONT=Arial,Arial][size=3]([/size][/FONT][FONT=Arial,Arial][size=3]Table 2304.9.1 Fastening Schedule[/size][/FONT][FONT=Arial,Arial][size=3]) is similar to the 2004 with some added description based on panel thickness. The [/size][/FONT]**2010 Florida Building Code – Building **[FONT=Arial,Arial][size=3]([/size][/FONT][FONT=Arial,Arial][size=3]Table 2304.9.1 Fastening Schedule[/size][/FONT][FONT=Arial,Arial][size=3]) maintains the same specifications as the 2007 Table. The foot notes indicate that 8d nails are the [/size][/FONT][size=3]
[size=3][FONT=Arial,Arial]minimum for any wood panel and that specific dimension nails require specific spacing of 6" o.c. edge and 6" o.c. intermediate\field. *
[FONT=Arial,Arial][FONT=Arial,Arial][size=3]Building Code Text (Residential Code): [/size][/size][/size][/FONT]**This text also matches the requirement that was in effect in the [FONT=Arial,Arial][size=3]2004 Florida Building Code – Residential [/size][/FONT]([FONT=Arial,Arial][size=3]Table R602.3(1) - Fastener Schedule for Structural Members[/size][/FONT]). The [FONT=Arial,Arial][size=3]2007 Florida Building Code – Residential [/size][/FONT]([FONT=Arial,Arial][size=3]Table R602.2(1) Fastener Schedule for Structural Members[/size][/FONT]) is similar to the 2004 but reduces the spacing down to 6" on the intermediate\field supports by footnote g based on windspeed being over or under 100 mph and within 48 inches from ridges, eaves and gable end walls. The **[FONT=Arial,Arial][size=3]2010 Florida Building Code – Residential [/size][/FONT]*moves these specifications into a new section, [FONT=Arial,Arial][size=3]Section R803 Roof Sheathing[/size][/FONT]. In [FONT=Arial,Arial][size=3]R803.2.3.1 Sheathing fastenings[/size][/FONT], 8d ring shank nails are called to be spaced 6" o.c. on the edge and 6" o.c. intermediate is identified. [/FONT]
[FONT=Arial,Arial][FONT=Arial,Arial][size=3]10d Nails – High Wind Nail Schedule [/size][/FONT]
***[size=3][FONT=Arial,Arial]RMS 11.0 Text: [/size][/FONT][FONT=Arial,Arial][size=3]The roof sheathing is fastened to the roof framing elements with 10d nails (3″ length, 0.148″ diameter) or screws with at least a minimum nailing schedule. [/size][/FONT]
**[FONT=Arial,Arial][size=3]Building Code Text: This is not a requirement when using structural panels (plywood or OSB). [/size][/FONT]**10d nails have only been called for as a minimum requirement when the roof sheathing thickness is 1 1/8" – 1 ¼" thick. *
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Roof deck nailing requirement was regional as stated above
Third nail requirement not sure. I have seen 1950’s houses with what look like 3 original nails
If its 100% hip we put 100% for total and 0% in non-hip section. We do not measure