Graphical Construction Glossary >> Temporary Work. >> formwork >> Back Propping

Back Propping
The technique of stripping the formwork in a suspended slab while still keeping it supported.

The structural engineer may require that a newly poured concrete slab should be supported by props for a certain amount of time until it has gained enough strength to support the loads to be imposed upon it.

At the same time the builder wants to strip the formwork and use it on the next slab.

The answer is to remove the formwork while at the same time never leaving the slab unsupported.

This is a fairly easy task, but it does take longer than just simply stripping the slab in the normal way and then sticking a few props up after everything has been cleared out.

For this reason or maybe because of ignorance a lot of formworkers do not back-prop correctly.

  • The basic principal is to place the required number of extra props on the plywood only. before anything else is removed.
  • Then, and only then, are the rest of the supports, beams, joists and the ply with no props holding it.
  • New props are then placed under the bare concrete.
  • Then the props that are left holding up just the ply sheets are removed one at a time, the ply is removed and the prop is put back against the concrete before the moving on to the next one.
  • In this way the slab is always supported.

For non glossary articles of a general and how to nature go to the formwork section on this site.

If you didn't find exactly what you are looking for try this search tool that will search the site and the web.

"What can be added to the happiness of a man who is in health, out of debt, and has a clear conscience?
Adam Smith 1723-1790

"When we build, let us think that we build for ever."John Ruskin 1819-1900

coates hire
Hire Equipment
Furniture Fittings - Architectural Hardware - Electronic Locking Systems - Technical Hardware
BuilderBill sponsorship

BuilderBill Books

building maths
Building Maths

Stair Design
asbestos ebook
Asbestos Book

Calculator Pages.

Concrete yardage calculator

Reader's Questions.

Questions and answers.



Please Note! The information on this site is offered as a guide only!  When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area.  It could be out of date!  Regulations breed faster than rabbits!
You must check your own local conditions.
Copyright © Bill Bradley 2007-2012. All rights reserved.
Page copy protected against web site content infringement by Copyscape