FacadeMart LogoFacadeMart
EducationArticles
Sign inGet started
Learning Hub
AboutJoin UsContact
Sign inGet started free
Get support
  • Help Center
  • Live Chat
  • Check Order status
  • Refunds
  • Report Abuse
Payments and protections
  • Safe and easy payments
  • Money-back policy
  • On-time shipping
  • After-sales protections
  • Product monitoring services
Source on Facademart.com
  • Request for Quotation
  • Membership program
  • FacadeMart.com logistics
  • Sales tax and VAT
Sell on Facademart.com
  • Start selling
  • Seller central
  • Become a verified supplier
  • Partnerships
  • Download the app for suppliers
Get to know us
  • About Facademart.com
  • Corporate responsibility
  • Become a verified supplier
  • News center
  • Careers

Trade on the go with FacadeMart.com

App storePlay store

Double Glazing Deflection Calculator

Double Glazing Unit Deflection & Load Sharing

Live
Unit Configuration
mm
mm
kPa
1Outdoor Lite
2Indoor Lite
Calculate for Single Glazing (SGU)

Aspect Ratio

1.60

Panel Area

3.60 m²

Outdoor Deflection

8.34mm

Indoor Deflection

8.34mm

Load Share LS1

0.50

Load Share LS2

0.50

Outdoor Lite SafetyCaution

132.5%

Capacity: 2.12 kPa

Indoor Lite SafetyCaution

132.5%

Capacity: 2.12 kPa

Before Load6mm4-SIDE SIMPLY SUPPORTEDWINDAfter LoadMAX DEFL.8.3mmSECTION A-Aδ = 8.3mm

Glass Type

Annealed

Thickness

6mm

Can Resist

2.12 kPa

Status

133% Caution

Before Load6mm4-SIDE SIMPLY SUPPORTEDWINDAfter LoadMAX DEFL.8.3mmSECTION A-Aδ = 8.3mm

Glass Type

Annealed

Thickness

6mm

Can Resist

2.12 kPa

Status

133% Caution

Need Professional Verification?

Get these calculations verified by our engineering experts for your project requirements.

contact@facademart.com+91 83699 72932

What is a Double Glazing Unit (DGU)?

A Double Glazing Unit (DGU), also known as an Insulated Glass Unit (IGU), consists of two glass panes separated by a sealed air or gas-filled cavity. When subjected to wind load, both panes work together to resist the pressure, with each lite sharing a portion of the load based on their relative stiffness. This load sharing mechanism is critical for understanding how DGUs perform under pressure.

The load share factors (LS1 and LS2) determine how much of the total wind pressure is resisted by each glass pane. These factors depend on the relative thickness and stiffness of each lite, making it essential to analyze both panes together for accurate structural assessment.

How to Calculate DGU Deflection with FacadeMart Calculator

Our DGU deflection calculator analyzes both outdoor and indoor lites simultaneously, computing individual deflections, load resistances, and safety factors based on the load sharing behavior of paired glass panels.

Step-by-Step Guide:

  1. 1Enter Unit Dimensions — Specify height and width in millimeters
  2. 2Set Wind Pressure — Input design wind load in kPa
  3. 3Configure Outdoor Lite — Select thickness and heat treatment
  4. 4Configure Indoor Lite — Select thickness and heat treatment
  5. 5Run Analysis — Get load share factors and individual lite results

Double Glazing Calculator Features

Load Share Analysis

Calculate LS1 and LS2 factors to understand how wind load is distributed between outer and inner glass panes.

  • LS1 - Outdoor lite share
  • LS2 - Indoor lite share
  • Based on relative stiffness

Individual Lite Results

Get detailed analysis for each glass pane including deflection and load capacity.

  • Outdoor lite deflection
  • Indoor lite deflection
  • Per-lite safety factors

Glass Configuration

Flexible configuration options for both outdoor and indoor glass panels.

  • 4mm to 19mm thickness
  • Annealed, HS, or Tempered
  • Independent lite settings

Frequently Asked Questions

What are load share factors in DGU?
Load share factors (LS1 and LS2) represent the proportion of wind load resisted by each glass pane in a double glazing unit. The stiffer pane carries more load. These factors always sum to approximately 1.0 (or 100% of the total load).
Should both lites have the same thickness?
Not necessarily. Using different thicknesses can be cost-effective. The outdoor lite often faces higher loads and may benefit from being thicker or using tempered glass, while the indoor lite may use annealed glass for safety in case of breakage.
How does the cavity affect performance?
This calculator assumes a standard sealed cavity. The cavity width affects thermal performance but has minimal impact on structural load sharing for typical DGU configurations. For very wide cavities or triple glazing, specialized analysis may be required.

Related Calculators

SGU Calculator

Single Glazing Unit deflection and load resistance analysis

ACP Calculator

Aluminium Composite Panel deflection under wind load

All Calculators

Explore our complete engineering calculator suite

Disclaimer:This calculator provides estimates for reference purposes only. Results should not be used for final engineeringdecisions. Always consult a qualified structural engineer for actual project requirements.