Astm e 1300

Understanding and Using ASTM E 1300 Joseph A. Reed, P.E. Director – Engineering and Product Testing

ASTM E 1300 Standard Practice for Determining Load Resistance of Glass in Buildings Book of Standards Volume 04.11 American Society for Testing Materials Philadelphia, Pennsylvania (www.astm.org)

ASTM E 1300 - What is it? Compendium of charts and tables based on experimental and analytical investigations for determining the Load Resistance of specific glass types.  Recognized and included by reference or direct insertion with simplifications by most building codes.  Vertical or Sloped glazing.  Wind, Snow and self-weight loads. 

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ASTM E 1300 - What it is not. Not for impact loads.  Not for blast loads or loads > 210 psf.  Not for wired, patterned, etched, sandblasted, drilled, notched or grooved glass (Although building codes address these types of glass).  Not for floors, aquariums, shelves, balustrades or structural glass. 

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ASTM E 1300 Which version to use?

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Check “Reference Standards” in Building Code (Chapter 35 FBC).



Can be called out in job specification.



Can use methods provided in building code.

ASTM E 1300 Which version to use?

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Building Code

Ref. ASTM E 1300

Florida Building 2001

ASTM E 1300-94

Florida Building 2001 with Glitch Revisions IBC 2000

ASTM E 1300-94

IBC 2003

ASTM E 1300-00

North Carolina 2001

ASTM E 1300-98

New York 2003

ASTM E 1300-00

ASTM E 1300-98

Applying ASTM E 1300 Input Information Glass type, GT (Annealed, HS, FT)  Glazing type, LS (monolithic, laminated, insulated, laminated+mono insulated)  Product Size (day light opening)  Aspect Ratio (length/width,a/b) (for laminated glass)  b/t (for laminated glass)  Load duration (short or long) 

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Applying ASTM E 1300 Output Information

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Nonfactored Loads, NFL



Load Resistances, LR



Glass Deflections



Load Resistance > Design Pressure OK



Deflection < 0.75 inch OK

LR = GTxLSxNFL (ASTM E 1300-00)

Glass Type

Load Resistance

Monolithic (§ 6.2)

NFL from Figures GT from Table 1 or Table 2

Laminated (§ 6.3)

Thickness from Table 5 NFL from Figures GT From Table 1 or Table 2

Insulated (§ 6.4)

NFL1 and NFL2 from Figures LS1 and LS2 from Table 7 GT1 and GT2 From Table 3.

IG: mono + laminated: Short Duration (§ 6.5)

Laminated Thickness from Table 5 NFL1 and NFL2 from Figures LS1 and LS2 from Table 7 GT1 and GT2 From Table 3.

IG: mono + laminated: Long Duration (§ 6.6)

Laminated Thickness is tmin. NFL3 and NFL4 from Figures LS3 and LS4 from Table 7 GT3 and GT4 From Table 3.

Example 1 IG unit consisting of 2 1/8” annealed lites, DLO=32x60

LR1 = LR2 LR = GTxLSxNFL GT = 0.9 (Table 2) LS = 2.0 (Table 7)

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Example 1 IG unit consisting of 2 1/8” annealed lites, DLO=32x60

LR = GTxLSxNFL GT = 0.9 (Table 3) LS = 2.0 (Table 7) NFL = 1.15 KPa = 24.0 psf

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LR = (0.9)x(2.0)x(24.0) = 43.2 psf

Example 2 IG unit with 1/8” tempered and 3/16” laminated consisting of 2 3/32” heat strengthened plies. DLO=48x48. Short Duration

Monolithic glass is Lite No. 1!  From Table 5 thickness of laminated glass is 3/16” . a/b=1.0 and b/t=256.  For tempered lite GT=3.8 (Table 3); LS=4.83 (Table 7)  For laminated lite GT=1.7 (Table 3); LS=1.26 (Table 7) 

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Example 2 IG unit with 1/8” tempered and 3/16” laminated consisting of 2 3/32” heat strengthened plies. DLO=48x48. Short Duration        

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From Table 5 thickness of laminated glass is 3/16” . a/b=1.0 and b/t=256. For tempered lite GT=3.8 (Table 3); LS=4.83 (Table 7) For laminated lite GT=1.7 (Table 3); LS=1.26 (Table 7) NFL1=1.05 KPa = 21.9 psf NFL2=1.85 KPa = 38.7 psf LR1=(3.8)x(4.83)x(21.9)=402 psf LR2=(1.7)x(1.26)x(38.7)=82.9 psf Repeat for Long Duration Loads (if necessary). Be sure to use tmin for laminated lite (new NFL Fig.)

Using Software

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Many good and inexpensive software packages available.



Be sure it supports the version of standard you are performing calculations for.



Be sure you understand internal assumptions (i.e. unit weight of glass)



Look for software that provides details of calculation and clear results summaries to assist sanity checks.

Pitfalls



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Firm Supports – λ/175 inch deflection requirement of supports is assumed.



Load Durations – ASTM E 1300 defines a short duration load of 60 seconds whereas most building codes have now adopted the 3-second gust.



Probability of Breakage – 8/1000 for charts and methods of ASTM E 1300. Specifications with more stringent breakage can be encountered.

ASTM E 1300 What Does AAMA Say? ANSI/AAMA/NWWDA 101/I.S.2-97 references ASTM E 1300-94  Glass used in testing must be “minimum strength required for given load and size based on ASTM E 1300”.  101/I.S. 2/NAFS-02 references ASTM E 1300-00 but E 1300-02 allowed by certification bulletin.  Glass used in testing must be “thinnest and weakest in accordance with ASTM E1300” 

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The End Thank you! Comments / Questions