ASTM E1300 16 glass load calculator
This ASTM E1300 16 calculator checks glass load resistance, deflection and glass thickness. E1300 16 is the 2016 edition of ASTM E1300, the standard practice for determining the load resistance of glass in buildings. It was approved in June 2016 and the edition before it was E1300 12a. GlassLoad.com can run a check to this edition for one rectangular lite of monolithic glass with four sided, three sided, two sided or one sided support, or of laminated glass of two plies with four sided or three sided support. GlassLoad.com is not affiliated with ASTM.
What GlassLoad.com checks under E1300 16
- Thicknesses offered: 2.0 mm (picture glass), 2.5, 3, 4, 5, 6, 8, 10, 12, 16, 19, 22 and 25 mm. The calculation uses the minimum thickness of each designation from Table 4, unless you enter a thickness override.
- Scope load limit: 315 psf, wind, snow and self weight combined. If the design load is higher, the result is still shown with a warning that it is outside the scope of the edition.
- Glass types and durations: annealed, heat strengthened and fully tempered glass, for a short duration load (3 seconds) or a long duration load (30 days).
- Deflection: the approximate center of glass deflection, read from the E1300 deflection chart of the nominal thickness, or from the equation in Appendix X1 where the chart gives no value. Clause X1.1.1 states that deflections larger than the glass thickness are rounded to the nearest millimeter, that a caution applies below one third of the load resistance, and that an aspect ratio above 5 is treated as 5.
- Probability of breakage: for annealed glass the report gives the probability of breakage at the design load, using the failure model written in clause 6.3.1 and Annex A2. It is information only. Pass or fail still compares the design load with the load resistance. The standard writes the limit as 8 lites per 1000.
- Laminated glass: the laminated glass charts of clauses 6.2.5 and 6.2.6, and for four sided support the effective thickness method of Appendix X9 with the analytical procedure of clause 6.3.2, where the chart gives no value.
What differs from the other editions
- Against E1300 12a: E1300 16 adds the 2.0 mm picture glass designation, a full probability of breakage model in Annex A2 with an analytical procedure in clause 6.3.
- Against E1300 09a: the scope limit is 315 psf instead of 210 psf, 25 mm glass is offered, the deflection equation is in Appendix X1 instead of Appendix X2, and the three deflection rules above are printed.
- Clause numbers differ from E1300 24: the monolithic procedures are in clause 6.2 and the analytical procedures in clause 6.3, where E1300 24 numbers them 7.2 and 7.3.
For monolithic glass on four sides, the printed non factored load charts of the editions agree closely. GlassLoad.com therefore uses the same load calculation for all of them, and the edition changes the thicknesses, the scope limit, the appendix names and the warning wording.
25 mm glass
For 25 mm glass the printed chart gives a load about 6 percent lower than the value calculated from the Table 4 minimum thickness of 24.61 mm. GlassLoad.com lets you choose either, and the report says which one it used.
Run a check with E1300 16
Open the calculator and pick E1300 16 as the edition. See also the guides, how the calculation works, the questions and answers and the guide on how to calculate glass load resistance. The other edition pages are E1300 24, E1300 12a and E1300 09a. Results are to be verified by a qualified professional.
Worked examples
These are the worked examples printed in E1300 16 that GlassLoad.com can run. GlassLoad.com computed each one from the printed inputs. Every example has its own page with all the steps. All worked examples
- Example 1, A3.1: Non factored load of a 47.24 by 59.06 in, 1/4 in annealed plate
- Example 2, A3.2: Non factored load of a 50 by 60 in, 1/4 in annealed plate
- Example 3, A3.3: Double glazed unit, 1/4 in tempered over 5/16 in laminated
- Example 4, A3.4: Center of glass deflection, 37.99 by 75.98 in, 1/4 in
- Example 5, A3.5: Center of glass deflection, 60 by 180 in, 3/8 in
- Example 6, A3.6: Triple glazed unit, 1/8, 3/32 and 1/8 in annealed lites
- Example 9, X1.2.1: Deflection with a measured thickness, converted from SI
- Example 10, X1.2.7: Deflection with a measured thickness, inch pound units
Not available in GlassLoad.com
- Example 7, A3.7: Probability of breakage of a laminated insulating glass unit. Not available in GlassLoad.com.
- Example 13, X9.7: Appendix X9 effective thickness of a laminated beam, a laminated cantilever with a line load. Not available in GlassLoad.com.
GlassLoad.com is an independent tool and is not affiliated with ASTM.