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Title: State of Connecticut

1
Welcome

State of Connecticut
Department of Public Safety
Roof Design and the Current Code
Martin A. Benassi, AIA
Architect

2
Does it meet code?
3
Safety
4
Outline

Codes
International Building Code 2003
International Plumbing Code 2003
International Mechanical Code 2003
International Existing Building Code 2003
International Energy Conservation Code 2003
International Residential Code - 2003
2005 Connecticut Supplement
Summary of changes
Review code by sections
Questions and answers

5
Summary

Chapter 15 - Roof Assemblies and Rooftop
Structures.
Chapter 35 standards (ASTM)
Appendix K Wind Speed by City (CT)
3407.1 Historic buildings (CT)
Minimum required roof pitch varies by material.
(Educational buildings)
Insulation R value thickness
Requirement by zone

Connecticut State Building Code first edition
1947

7
Referenced Standards

Chapter 35
ASTM (partial list)
B101 Specification for Lead-Coated Copper Sheet
and Strip for Building Construction
C1167 Specification for Clay Roof Tiles
D41 Specification for Asphalt Primer Used in
Roofing, Dampproofing, and Waterproofing
D43 Specification for Coal Tar Primer Used in
Roofing, Dampproofing, and Waterproofing
D224 Specification for Smooth-Surfaced Asphalt
Roll Roofing (organic felt)
D225- Specification for Asphalt Shingles (organic
felt) Surfaced with Mineral Granules
D226 Specification for Asphalt Saturated
Organic Felt Used in Roofing and Waterproofing

Referenced Standards chapter 35
ASTM (partial list)
D227 Specification for Coal-Tar Saturated
Organic Felts Used in roofing and Waterproofing
D249 Specification for Asphalt Roll Roofing
(organic felt) Surfaced with Mineral Granules
D312 Specification for Asphalt Used in Roofing
D371 Specification for Asphalt Roll Roofing
(organic felt) Surfaced with Mineral Granules
Wide-Selvage
D1227 Specification for Emulsified Asphalt Used
as a Protective Coating for Roofing
D1761 Test Method for Mechanical Fasteners in
Wood
D1863 Specification for Mineral Aggregate Used
on Built-up Roofs
D1970 Specification for Self-Adhering Polymer
Modified Bituminous Sheet Materials Used as Steep
Roof Underlayment for Ice Dam Protection

Referenced Standards chapter 35
ASTM (partial list)
D2178 Specification for Asphalt Glass Felt Used
in Roofing and Waterproofing
D2626 Specification for Asphalt-Saturated and
Coated Organic Felt Base Sheet Used in Roofing
D2822 Specification for Asphalt Roof Cement
D2823 Specification for Asphalt Roof Coatings
D3019 Specification for Lap Cement Used with
Asphalt Roll Roofing, Non-Fibered, Asbestos
Fibered, and Non-Asbestos Fibered.
D3462 Specification for Liquid-Applied Neoprene
and Chlorosulfonated Polyethylene Used in Roofing
and Waterproofing
D3746 Test Method for Impact Resistance of
Bituminous Roofing Systems
D3747 Specification for Emulsified Asphalt
Adhesive for Adhering Roof Insulation
D3909 Specification for Asphalt Roll Roofing
(glass felt) Surfaced with Mineral Granules

Referenced Standards chapter 35
ASTM (partial list)
D4022 Specification for Coal Tar Roof Cement,
Asbestos Containing
D4434 Specification for Poly (vinyl chloride)
Sheet Roofing
D4479 Specification for Asphalt Roof Coatings
Asbestos Free
D4586 Specification for Asphalt Roof Cement
Asbestos Free
D4601 Specification for Asphalt-Coated Glass
Fiber Base Sheet Used in Roofing
D4869 Specification for Asphalt-Saturated
(organic felt) Underlayment Used in Steep Slope
Roofing
D4897 Specification for Asphalt-Coated
Glass-Fiber Venting Base Sheet Used in Roofing
D4990 Specification for Coal Tar Glass Felt
Used in Roofing and Waterproofing
5019 Specification for Reinforced
Non-Vulcanized Polymeric Sheet Used in Roofing
Membrane

Referenced Standards chapter 35
ASTM (partial list)
D5643 Specification for Coal Tar Roof Cement,
Asbestos-Free
D5665 Specification for thermoplastic Fabrics
Used in Coal-Applied Roofing and Waterproofing
D5726 Specification for Thermoplastic Fabrics
Used in Hot-Applied Roofing and waterproofing
D6083 Specification for Liquid Applied Acrylic
Coating Used in Roofing
D6162 Specification for Styrene Butadiene
Styrene (SBS) Modified Bituminous Sheet Materials
Using a Combination of Polyester and Glass Fiber
Reinforcements
D6163 Specification for Styrene Butadiene
Styrene (SBS) Modified Bituminous Sheet Materials
Using Glass Fiber Reinforcement
D6164 Specification for Styrene Butadiene
Styrene (SBS) Modified Bituminous Sheet Metal
Materials Using Polyester Reinforcement
D6222 Specification for Atactic Polypropylene
(APP) Modified Bituminous Sheet Materials Using
Polyester Reinforcements

Referenced Standards chapter 35
ASTM (partial list)
D6223 Specification for Atactic Polypropylene
(APP) Modified Bituminous sheet Materials Using a
Combination of Polyester and Glass Fiber
Reinforcements
D6298 Specification for Fiberglass Reinforced
Styrene-Butadiene-Styrene (SBS) Modified
Bituminous Sheets with a Factory Applied Metal
Surface
E108 Test Methods for fire Tests of Roof
Coverings
E1592 Test Method for Structural Performance of
Sheet Metal Roof and Siding Systems by Uniform
Static Air Pressure difference
F1667 Specification for Driven fasteners
Nails, Spikes, and Staples

13
Todays Roofing Industry

Rapidly changing technology with new products
entering the market every day.
Nu-loc slate roofing,
batten and channel system for fastening of
slate lightweight.
Rubberized slate,
manmade imitation slate product -
lightweight.

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Todays Roofing Industry

Approximately 65 of all lawsuits are roofing
related.
Testing of new products
ASTM, FM, UL difficulty in keeping up with the
industry
NRCA and other trade associations are trying to
inform, instruct and help educate those who
select, maintain, install and replace roofs to
avoid untimely failures.

18
International Building Code

504.3 Roof Structures (building height
limitations - penthouses)
602.4.3 Roof Framing (types of construction
and limitations)
602.4.5 Roofs (deck construction)
Table 720.1 (minimum protection for floor and
roof systems 1,2,3,4 hour)
721.2.2.3 Multicourse roofs (fire-resistance
ratings for concrete roof assemblies)
Table 721.6.2 (roofing over wood frame)
910.2 smoke and heat vents where required

Chapter 15 Roof Assemblies and Rooftop
Structures
Section 1502 Definitions
Positive Roof Drainage. The drainage condition
in which consideration has been made for all
loading deflections of the roof deck, and
additional slope has been provided to ensure
drainage of the roof within 48 hours of
precipitation.
Roof Assembly. A system designed to provide
weather protection and resistance to design
loads. The system consists of a roof covering
and roof deck or a single component serving as
both the roof covering and the roof deck. A roof
assembly includes the roof deck, vapor retarder,
substrate or thermal barrier, insulation, vapor
retarder and roof covering.

Section 1503 Weather Protection
1503.4 Roof drainage. Design and installation of
roof drainage systems shall comply with the
International Plumbing Code.
1503.5 Roof ventilation. Intake and exhaust
vents shall be provided in accordance with
Section 1203.2 and the manufacturers
installation instructions.
Section 1203 Ventilation
1203.1 General. Buildings shall be provided with
natural ventilation in accordance with Section
1203.4, or mechanical ventilation in accordance
with the International Mechanical Code.

1203.2 Attic spaces. Enclosed attics and
enclosed rafters spaces formed where ceilings are
applied directly to the underside of roof framing
members shall have cross ventilation for each
separate space by ventilation openings protected
against the entrance of rain and snow. Blocking
and bridging shall be arranged so as not to
interfere with the movement of air. A minimum of
1 inch of airspace shall be provided between the
insulation and the roof sheathing. The net free
ventilating area shall not be less than 1/150 of
the area of the space ventilated, with 50 percent
of the required ventilating area provided by
ventilators located in the upper portion of the
space to be ventilated at least 3 feet above eave
or cornice vents with the balance of the required
ventilation provided by eave or cornice vents.

Exception The minimum required net free
ventilating area shall be 1/300 of the area of
the space ventilated, provided a vapor retarder
having a transmission rate not exceeding 1 perm
in accordance with ASTM E96 is installed on the
warm side of the attic insulation and provided 50
percent of the required ventilating area provided
by ventilators located in the upper portion of
the space to be ventilated at least 3 feet above
eave or cornice vents, with the balance of the
required ventilation provided by eave or cornice
vents

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Section 1504 Performance Requirements
1504.1 Wind resistance of roofs.
1504.2 Wind resistance of clay and concrete tile.
1504.3 Wind resistance of non-ballasted roofs.
1504.4 Ballasted low-slope roof systems.
1504.5 Edge securement for low-slope roofs.
1504.6 Physical properties.
1504.7 Impact resistance.
1505 Fire Protection
Class A roof assemblies. Effective against
severe fire- test exposure.
Class B roof assemblies. Effective against
moderate fire-test exposure.
Class C roof assemblies. Effective against light
fire- test exposure.

1505.5 Non-classified roofing.

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1505.6 Fire-retardant-treated wood shingles and
shakes.
1505.7 Special purpose roofs. Special purpose
wood shingle or wood shake roofing shall conform
with the grading and application requirements of
Section 1507.8 or 1507.9. In addition, an
underlayment of 0.625-inch Type X water-resistant
gypsum backing board or gypsum sheathing shall be
placed under minimum nominal 0.5-inch-thick wood
structural panel solid sheathing or 1-inch
nominal spaced sheathing.

Section 1506 Materials
1506.1 Scope. Roof coverings shall be applied in
accordance with this chapter and the
manufacturers installation instructions.
1506.2 Compatibility of materials.
1506.4 Product identification. Roof covering
materials shall be delivered in packages bearing
the manufacturers identifying marks and approved
testing agency labels required in accordance with
Section 1505.

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Material Storage Identification
30

Section 1507 Requirements for Roof Coverings
1507.1.1 (add CT Amendments was not listed in
last download) Special requirements for Group E
school roofs. Pursuant to the requirements of
subsection (b) of section 10-291 of the
Connecticut General Statutes, the Department of
Education shall not approve a school building
project plan or site, as applicable, if the plans
incorporate new roof construction or total
replacement of an existing roof and do not
provide for a minimum roof pitch of ½12.

Not a code requirement as of yet, therefore, no
modification is permitted. However, a variance
reducing the slope to ¼ per foot for reroofing
projects only can be obtained from the Schools
Facilities Unit.
The application must come from the superintendent
with support documentation from the architect or
engineer certifying that all four of the
criteria have been met.

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Asphalt shingles
33

Section 1507 Requirements for Roof Coverings
1507.2 Asphalt shingles. Review ASTM standards.
1507.2.1 Deck requirements. (fastened to solidly
sheathed decks.)
1507.2.2 Slope. Asphalt shingles shall only be
used on roof slopes of 212 or greater. For roof
slopes from 2 to 4 a double underlayment
application is required.

15072.5 Asphalt shingles. ASTM D225 or ASTM
D3462
1507.2.6 Fasteners. Fasteners for asphalt
shingles shall be galvanized, stainless steel,
aluminum or copper roofing nails, minimum 12 gage
shank with a minimum 0.375 inch-diameter head, of
a length to penetrate through the roofing
materials and a minimum of 0.75 inch into the
roof sheathing.

35
Decking
36
Decking

Decking must be dry, level, properly attached and
in good condition.

1507.2.7 Attachment. Minimum number of fasteners
required by the manufacturer, or as required by
Chapter 15. For normal application, asphalt
shingles shall be secured to the roof with not
less than four fasteners per strip shingle or two
fasteners per individual shingle. Where the roof
slope exceeds 20 units vertical in 12 units
horizontal or where the basic wind speed per
Appendix K is 110 mph or greater, asphalt
shingles shall be secured to the roof in
accordance with the manufacturers special
installation instructions or, in the absence of
such instructions, with not less than six
fasteners per strip shingle or three fasteners
per individual shingle.

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Nailing Pattern
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Appendix K (Connecticut Supplement)
by city/town
Canaan 90 mph
Cheshire 105 mph
Derby 110 mph
Groton 120 mph

1507.2.8 Underlayment application.
2/12 to 4/12 slope double layer, 19 wide
starter strip followed by application of 36 wide
sheet of underlayment overlapping successive
sheets 19.
For slope of 4/12 one layer of underlayment is
acceptable with an overlap of 2
1507.2.8.1 High wind attachment. According to
manufacturers instructions with
corrosion-resistant fasteners not over 36 o.c..
1507.2.8.2 Ice dam membrane. Two layers of
underlayment cemented together or a self-adhering
polymer modified bitumen sheet extending at least
24 inside the exterior wall line of the building.

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Flashing
44

1507.2.9 Flashing
1507.2.9.1 Base and cap flashing. Installation as
per manufacturers instructions. Base flashing
shall be of either corrosion-resistant metal
.019 thick minimum or mineral-surfaced roll
roofing 77 pounds per 100 s.f.. Cap flashing
shall be corrosion-resistant metal .019 thick
minimum.
1507.2.9.2 Valleys. Valley lining of the
following type
Open valleys 16 wide and lined with
corrosion-resistant metal.
Open valleys two plies of mineral-surfaced roll
roofing (lower layer 18 wide, top layer 36
wide).
Closed valleys one ply of smooth roll roofing,
36 wide.

45
Closed Cut Valley
46

1507.2.9.3 Drip edge. Provide drip edge at eaves
and gables of shingle roofs with an overlap of 2
minimum. Extend ¼ below sheathing and back onto
roof 2 minimum. Nail at 12 o.c..
A cricket shall be installed on any chimney
greater than 30 wide. Material shall be sheet
metal or of same material as roof covering.
1507.3 Clay and concrete tile.
1507.3.2 Deck slope. Installed on roof slopes of
2 ½ /12 or greater.
1507.3.5 Concrete tiles. Review ASTM standards.
1507.3.6 Fasteners. Tile fasteners shall be
corrosion resistant and not less than 11 gage,
5/16 head.
1507.3.7 Attachment. As per Table 1507.3.7

1507.3.8 Application. According to manufacturers
instructions based on climatic conditions, roof
slope, underlayment system and type of tile being
used.
1507.3.9 Flashing. Metal shall be 0.019 thick
corrosion-resistant. Valley flashing shall extend
11 either side of center with a 1 high diverter
rib at center. End laps of 4 inches. Eave
flashing same as with asphalt shingles.
But what about the cleats?????

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Valley
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1507.4 Metal roof panels.
1507.4.1 Deck requirements
1507.4.2 Deck slope
1507.4.4 Attachment
1507.5 Metal roof shingles
1507.5.3 Underlayment
1507.5.6 Flashing
1507.5.5 Attachment
But what about the snow guards???
1507.6 Mineral-surfaced roll roofing

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1507.7 Slate roofing
1507.7.1 Deck requirements
1507.7.2 Deck slope (412 or greater)
1507.7.5 Application
1507.7.6 Flashing (sheet metal)

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Starter Course
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1507.8 Wood shingles
1507.8.1 Deck requirements
1507.8.2 Deck slope (312)
1507.8.5 Attachment
1507.8.6 Application
1507.9 Wood shakes
1507.9.2 Deck slope (412)

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1507.10 Built-up roofs
1507.10.1 Slope (1/412 except for coal-tar pitch
1/812)

1507.11 Modified bitumen roofing - MBR
1507.11.1 Slope (1/412)
Exception 1/812 will be permitted when the
following two conditions are met
The roofing material is warranted / guaranteed by
both the roofing material manufacturer and the
roofing installer for the proposed slope.
The registered design professional responsible
for the design of the roof structure certifies
that the roof structure is designed to support
all loads, including any additional loads
resultant to the reduced slope.

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1507.12 Thermoset single-ply roofing
1507.12.1 Slope (same as for MBR)
1507.13 Thermoplastic single-ply roofing
1507.13.1 Slope (same as for MBR and Thermoset)

1507.14 Sprayed polyurethane foam roofing
1507.14.1 Slope (1/412)
1507.14.3 Application. Per manufacturers
specifications. A liquid-applied protective
coating shall be applied no less than 2 hours nor
more than 72 hours following application of the
foam.
1507.15 Liquid-applied coatings
1508 Roof Insulation
1508.1 General ( above deck insulation shall
conform to FM4450 and UL 1256)
1509 Rooftop Structures
1509.2 Penthouses (not more than 1/3 the area of
the supporting roof)
1509.2.1 Type of construction

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Reroofing

You know its time for a new roof when -

1510 Reroofing
1510.1 General (shall comply with the
requirements of Chapter 15)
Exception Reroofing shall not be required to
meet the minimum design slope requirement of ¼12
in Section 1507 for roofs that provide positive
roof drainage.
1510.3 Recovering versus replacement. New roof
coverings shall not be installed without first
removing all existing layers of roof coverings
where any of the following conditions occur

1. Where the existing roof covering is water
soaked or has deteriorated to the point that the
existing roof or roof covering is not adequate as
a base for additional roofing.
2. Where the existing roof covering is wood
shake, slate, clay, cement or asbestos-cement
tile.
3. Where the existing roof has two or more
applications of any type of roof covering.

1510.4 Roof recovering. Covering over wood
shingles or shakes requires gypsum board, mineral
fiber, glass fiber or other approved materials
securely fastened in place.
SHAKES???
1510.5 Reinstallation of materials. Slate, clay
or cement tile shall be permitted for
reinstallation.

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Chapter 16 Structural Design
1608.3 Flat roof snow loads. Roofs with a slope
less than 5 deg. shall be calculated in
accordance with Section 7.3 of ASCE 7-02. Not
less than 30 lbs per square foot minimum.
Determine partial loading effects such as
drifting, unbalanced snow loads and snow sliding
loads.
1608.4 Sloped roof snow loads. Roofs with a
slope greater than 5 deg. (same)
1609.3 Basic wind speed. Appendix K.

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1947
70
International Plumbing Code

Chapter 9 - Vents (CT Amend)
904.1 Roof extension. All open vent pipes that
extend through a roof shall be terminated at
least 12 inches above the roof, except that where
a roof is to be used for any purpose other than
weather protection, the vent extension shall be
run at least 7 feet above the roof.
904.3 Flashing. The juncture of each vent pipe
with the roof line shall be made water tight by
an approved flashing.

Chapter 11 Storm Drainage
1101.7 Roof design. Roofs shall be designed for
the maximum possible depth of water that will
pond thereon as determined by the relative levels
of roof deck and overflow weirs, scuppers, edges
or serviceable drains in combination with the
deflected structural elements. In determining
the maximum possible depth of water, all primary
roof drainage means shall be assumed to be
blocked.
1101.8 Cleanouts required
1102.6 Roof drains. Roof drains shall conform to
ASME A112.21.2M or ASME A112.3.1.

6 inches of snow created at least 5.2 pounds per
square foot of additional weight.

Section 1105 Roof Drains
1105.1 Strainers. Roof drains shall have
strainers extending not less than 4 inches above
the surface of the roof immediately adjacent to
the roof drain. Strainers shall have an
available inlet area, above roof level, of not
less than one and one-half times the area of the
conductor or leader to which the drain is
connected.

1105.1 Flat decks. Roof drain strainers for use
on sun decks, parking decks and similar areas
that are normally serviced and maintained shall
comply with Section 1105.1 or shall be of the
flat-surface type, installed level with the deck,
with an available inlet area not less than two
times the area of the conductor or leader to
which the drain is connected.
1105.3 Roof drain flashing. The connection
between roofs and roof drains which pass through
the roof and into the interior of the building
shall be made water tight by the use of approved
flashing material.

Section 1106 Size of Conductors, Leaders and
Storm Drains
1106.1 General. The size of the vertical
conductors and leaders, building storm drains,
building storm sewers, and any horizontal
branches of such drains or sewers shall be based
on the 100 year hourly rainfall rate indicated in
Figure 1106.1 or on other rainfall rates
determined from approved local weather data.

Appendix B Rates of Rainfall for Various Cities
Connecticut
Hartford 2.7
New Haven 2.8
Putnam 2.6

1106.2 Vertical conductors and leaders. Vertical
conductors and leaders shall be sized for the
maximum projected roof area in accordance with
Table 1106.2.
1106.3 Building storm drains and sewers. The
minimum slope of horizontal branches shall be
one-eighth unit vertical in 12 units horizontal
unless otherwise approved.

Section 1106 Size of Conductors, Leaders and
Storm Drains
1106.4 Vertical walls. In sizing roof drains and
storm drainage piping, one-half of the area of
any vertical wall that diverts rain-water to the
roof shall be added to the projected roof area
for inclusion in calculating the required size of
vertical conductors, leaders and horizontal storm
drainage piping.

1106.5 Parapet wall scupper location. Parapet
wall roof drainage scupper and overflow scupper
location shall comply with the requirement of the
International Building Code.
1106.6 Size of roof gutters. The size of
semicircular gutters shall be based on the
maximum projected roof area in accordance with
Table 1106.6.

Section 1107 Secondary (Emergency) Roof Drains
1107.1 Secondary drainage required. Secondary
(emergency) roof drains or scuppers shall be
provided where the roof perimeter construction
extends above the roof in such a manner that
water will be entrapped if the primary drains
allow buildup for any reason.

1107.2 Separate systems required. Secondary roof
drain systems shall have the end point of
discharge separate from the primary system.
Discharge shall be above grade, in a location
which would normally be observed by the building
occupants or maintenance personnel.

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Section 1107 Secondary (Emergency) Roof Drains
1107.3 Sizing of secondary drains. Secondary
(emergency) roof drain systems shall be sized in
accordance with Section 1106 based on the
rainfall rate for which the primary system is
sized in Tables 1106.2, 1106.3 and 1106.6.
Scuppers shall be sized to prevent the depth of
ponding water from exceeding that for which the
roof was designed as determined by Section
1101.7. Scuppers shall not have an opening
dimension of less than 4 inches. The flow
through the primary system shall not be
considered when sizing the secondary roof drain
system.

Section 1110 Controlled Flow Roof Drain Systems
1111.1 Minimum number of roof drains. Not less
than two roof drains shall be installed in roof
areas 10,000 square feet or less and not less
than four roof drains shall be installed in roofs
over 10,000 square feet in area.

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1947

12 Storm Water Drains
Drainage of Yard, Areas and Roofs All roof and
paved areas, yard, courts, and courtyards shall
be drained into a storm water sewerage system,
but not into sewers intended for sewage only.
Size of Storm Drains The required sizes of
storm water drains and other lateral storm drains
shall be determined on the basis of the total
drained area in horizontal projection in
accordance with the following table

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International Energy Conservation Code

Chapter 5 Residential Building Design by
Component Performance Approach
Section 502 Building Envelope Requirements
502.1.1 Moisture control
ceilings not ventilated to allow moisture to
escape shall be provided with an approved vapor
retarder.

502.1.3 Recessed lighting fixtures
502.2 Heating and cooling criteria. The building
envelope shall meet the provisions of Table
502.2.
Roof / ceiling ---------------

502.2.1.2 Roof / ceiling. The combined thermal
transmittance value (U) of the gross area of the
roof or ceiling assembly shall not exceed the
value given in Table 502.2. Equation 5-5 shall
be used to determine acceptable combinations to
meet this requirement.

Chapter 6 Simplified Prescriptive Requirements
for Detached One- and Two-Family Dwellings and
Group R-2, R-4 or Townhouse Residential Buildings
602.1.2 Ceilings. The required Ceiling R-value
in Table 602.1 assumes standard truss or rafter
construction, and shall apply to all roof /
ceiling portions of the building thermal
envelope, including cathedral ceilings.

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Chapter 7 Building Design for all Commercial
Buildings
802.1 General. Walls, roof assemblies, floors,
glazing and slabs on grade which are part of the
building envelope for buildings where the window
and glazing door area is not greater than 50
percent of the gross area of above-grade walls
shall meet the requirements of Section 802..2.1
through 802.2.9, as applicable. Buildings with
more glazing shall meet the applicable provisions
of ASHRAE / IESNA 90.1.

802.2.4 Roof assembly. The minimum thermal
resistance (R-value) of the insulating material
installed either between the roof framing or
continuously on the roof assembly shall be as
specified in Table 802.2(1), 802.2(2), 802.2(3)
or 802.2(4), based on construction materials used
in the roof assembly.

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Table 802.2(27) Climate Zone 12a
glazing and door area
greater than 25 but less than 50
Insulation R value
R 30 between framing
R 23 continuous

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Free Software

US Department of Energy
www.energycodes.gov
REScheck (residential buildings)
CAMcheck (commercial buildings)

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1947
?
99
Insulation Attachment

Appendix K (Connecticut Supplement)
90,105,110,120 mph

100

Consult Factor Mutual Loss Prevention Data Sheets
1-28 and 1-29 for instructions for determining
the required corner and perimeter fastening
information as well as insulation securement.
NOTE Do not assume a wind speed of 120 mph
means an uplift of 120 mph.
You need to take into account other factors
including wind exposure, building height, profile
and material.

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Example
Location New Haven (120 mph)
Height 15
Ground roughness C
Wind exposure 2
FM approved class 1-90 rated roof system (deck
and above-deck components) would be acceptable
Roof field 1 per 4 sf
Perimeter 1 per 2 sf
Corner 1 per 2 sf

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