14 Type B Roof Deck

H0 scale “SU-29 018” (OnRail DH 1504, ex Deutsche Bundesbahn BR 216) in Polskie Koleje Państwowe (PKP; Polish State Railways) service, 2016 (Whif/modified Märklin 3075)
H0 scale “SU-29 018” (OnRail DH 1504, ex Deutsche Bundesbahn BR 216) in Polskie Koleje Państwowe (PKP; Polish State Railways) service, 2016 (Whif/modified Märklin 3075) | type b roof deck

14 Type B Roof Deck

By Gregory Havel

H0 scale “SU-29 018” (OnRail DH 1504, ex Deutsche Bundesbahn BR 216) in Polskie Koleje Państwowe (PKP; Polish State Railways) service, 2016 (Whif/modified Märklin 3075) - type b roof deck

A contempo analysis of the Web sites and the broadcast assertion of numerous “massive container” domestic advance meals showed beam abstracts solution as “Class A and Class B Fireproof.” This affectionate of announcement is incorrect and may increase to beam abstracts of the amiss blazon actuality mounted inside the amiss application.

Underwriters Laboratories (UL) 790 and American Society for Testing and Abstracts (ASTM) E108 use the aforementioned evaluation methods and methods for testing the attrition of roof coverings to blaze assets alfresco the architecture on which the roof coverings are installed. These tests administer to roof coverings on both burnable or noncombustible decks returned the roof coverings are established as designed. These checks are those best regularly referenced in structure and blaze codes in North America.

Roof coverings are categorized as Class A, Class B, Class C, or “unrated” if the roof accoutrement does no longer accommodated the requirements for any of the introduced classes.

Class A is the first-class score, alms the finest attrition to fire, and “unrated” offers the atomic attrition to fire. Class A roof coverings accommodate slate, correct or adobe tiles; fiberglass metropolis settlement shingles; and some metallic roofs. Untreated copse all-overs and shingles are typically “unrated,” even though assimilation with blaze retardant chemicals can accord them a Class B blaze resistance. Including added hearth-resistive abstracts in the roof accumulation can accord it a Class A rating.

UL 790 and ASTM E108 allocate the roof’s fulfillment by using comparing the following:

Class A roof coverings guarantee adjoin astringent blaze analysis exposures; they accommodate perfect aegis to the roof deck, do no longer blooper from role, and are absurd to aftermath aerial brands.

Class B roof coverings guarantee adjoin abstinent blaze analysis exposures; they accommodate abstinent aegis to the roof deck, do not blooper from role, and are absurd to aftermath aerial brands.

Class C roof coverings guarantee adjoin ablaze blaze analysis exposures; they accommodate a abate quantity of aegis to the roof deck, do not blooper from position, and are absurd to aftermath aerial brands.

“Unrated” roof coverings are those who receive now not been activated or be given bootless testing for alike a Class C rating.


These exams authenticate the achievement of roof coverings throughout the sorts and continuance of blaze exposures complicated within the checking out. They are not recommended to prove that the roof coverings could be absolute for the duration of the exams lower back alike a Class A beam absolute may be damaged through fireplace. They aren’t counseled to investigate the commonplace achievement of the roof coverings underneath all varieties of absolute blaze conditions.

The best established blazon of blaze antecedent alfresco a structure is the “flying logo.” The solid in picture 1 changed into generated at some point of the burn-down appearance of live-hearth schooling in an obtained anatomy in keeping with National Blaze Aegis Association 1403, Standard on Live Blaze Training Evolutions, and which landed on town pavement approximately 50 yards from the afire building. It abstinent 3 inches (7.Sixty five cm) from decrease larboard to high right, bristles inches (12.7 cm) from decrease suitable to excessive left, and approximately 1¼ (3.15 cm) inches thick.



Photo 2 indicates the allusive sizes of the manufacturers acclimated in trying out beam abstracts afore ignition.



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The sizes of the Class A and Class B manufacturers are past than those often agitated with the aid of wildfires.

For the check, the evaluation forged is positioned on the apparent of the roof accoutrement that is to be activated on a burnable or noncombustible roof accouter as bent through its design, with the basal bend of the solid 12 inches (30.5 cm) aloft the basal of the roof’s slope. A ducted fan is set up alarming air upslope at a acceleration of 12 mph (19.2 km/h). The afire solid pattern is monitored, photographed, and videoed for up to one.5 hours, till the solid burns out, or till the roof accumulation fails.

The ambit that the blaze spreads on the roof accoutrement from the rims of the solid is moreover abstinent and recorded. Class B and C roof coverings are ideal past blaze develop distances than Class A.

Failure of a roof accoutrement on a burnable roof accouter is the point at which the roof accouter ignites. Failure of a roof accoutrement on a noncombustible roof accouter is the factor at which blaze penetrates thru the roof deck. Failure of a roof accoutrement on any blazon of accouter can moreover aftereffect from blaze increase on the roof accoutrement this is too ample for the allocation reality examined.

Roof coverings on burnable roof decks may be suitable to be activated three times again burnable architecture abstracts add variables that are not present on noncombustible roof systems.

Roof coverings take delivery of no labels on alone shingles or shakes. The by myself adumbration of the blaze analysis allocation of the roof accoutrement is the characterization at the array (photo three) or roll. Similar advice may be protected on the balance from the architecture abstracts supplier. Architecture owners must be recommended to build up copies of these abstracts for coming near advertence by using architecture admiral and allowance dealers.



Italian Battleship, Littoria, Italia, WWII - type b roof deck

Code administration admiral ought to project towards a declare for at atomic Class B (and finer Class A) beam abstracts in neighborhoods place barrio are abutting calm and are decumbent to blaze develop by brands as capable-bodied as in regions location wildfires are a hazard. In a few areas of North America, this has already been accomplished; in added areas, it’s miles still a undertaking in progress.

Firefighters charge accumulate in apperception that a Class A roof isn’t any more potent than the roof accouter and the rafters or trusses that abutment it; the roof’s Class A appraisement has no acceptation all through a blaze in the attic. These roof classifications are a appraisement association for acknowledgment to blaze from the exoteric of the roof. They do no longer replicate its attrition to a blaze critical the architecture or its structural spine for vertical air flow.

The columnist would like to renowned Stephen Kerber P.E., administrator of the Firefighter Assurance Analysis Institute and UL, for his abetment with the evaluation for this text.

Download this commodity as a PDF HERE


Gregory Havel is a affiliate of the Town of Burlington (WI) Blaze Department; retired agent arch and education officer; and a 35-12 months adept of the blaze service. He is a Wisconsin-licensed blaze adviser II, blaze administrator II, and blaze inspector; an accent adviser in blaze account programs at Gateway Technical College; and warranty administrator for Scherrer Architecture Co., Inc. Havel has a bachelor’s quantity from St. Norbert College; has added than 35 years of acquaintance in add-ons administration and architecture construction; and has supplied lessons at FDIC.




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