Formwork removal: know the right time and precautions (2023)

Formwork is temporary forms in whichspecificcast and compacted in cast concrete according to design. The formwork is placed in the correct position for casting concrete structural elements. The formwork is held in place until the concrete has set and begins to gain strength.
Formwork removal is recommended only when the concrete has gained sufficient strength to support its own weight without the aid of formwork or support. Before going into the precautions to be taken when removing formwork or props, it is always necessary to know the right time to remove the formwork. The formwork must be removed after the desired strength has been achieved by the concrete structural elements supported in the formwork. Here we provide brief information about the correct time for removing the form and the precautions to be taken.


Most important mistakes to avoid in formwork during pouring

  • Formwork removal: know the right time and precautions (2)

    Mahadev Desai

  • 20. april 2018

Formwork removal: know the right time and precautions (3)
(Video) De Shuttering Period Of Formwork |Concrete formwork removal time|
Politeness -Chairmanship

Correct time to remove the formwork

The time from the moment the concrete is placed in the mold to the moment the mold is removed is called the support period. This period may vary depending on several factors, such as:

  • type aconcrete quality
  • Additionsused for concrete mixing
  • The formwork projects
  • Temperature
  • Type of building element (columns/beams/slabs)
  • material quality
  • healing relationship
Also read:Pouring concrete during the rain

The process of removing the formwork takes place after the concrete has been laid and has gained sufficient strength, it is called formwork. This will result in stresses on the structural member as the loss of support on the sides or bottom due to loss of support now makes it the responsibility of the structure to support itself. A properly cured concrete element can withstand these external loads during formwork removal. The formwork is left for a longer time to promote the hardening process of the concrete elements.
The normal period after which the formwork can be removed as per IS:456-2000 clause 11 is shown below:

Deadline for removing forms

Structural member description

Exclusion period (days)

Soffit formwork for slabs3
Beam soffits - the props in the lower left corner7
Removal of stamps for plates up to 4.5 m7
Removal of seals for slabs > 4.5 m14
Beams and arches up to 6 m14
Beams and arches with a span of more than 6 m21
Walls, columns, beam vertical side4 – 24 timer

The above conditions apply under normal circumstances; The normal temperature is not less than 15 degrees Celsius and the cement used is soordinary portland cement. At lower temperatures and other types of cement, the recommended time can be adjusted. In such cases, the instructions must be removedcivil engineer.


Cement widespread building material | All the basic information you need to know!

  • Formwork removal: know the right time and precautions (5)

    Ritesh Patel

  • 6. maj 2019

    (Video) De-Shuttering Period of Column, Slab, Beam as per IS 456 | Stripping time by Learning Technology
Formwork removal: know the right time and precautions (6)
Politeness -Haf

Requirements and precautions for removing formwork

Removal of the formwork must be carried out in such a way that shocks or vibrations are transferred to the concrete as little as possible. Driving into the formwork must not cause damage to the structure.

Some precautions taken during the removal of the formwork are:

  • Always start removing the formwork when the element has reached the formwork time, which is determined by the results of tests carried out in the laboratory. For ordinary small and general structures where testing is not possible, follow the instructions on the drawings or instructions from the structural engineer.
  • The compressive strength is monitored according to the IS method. The test is performed on standard cubes and/or cylinders of the same sample mixture.
Formwork removal: know the right time and precautions (7)
Politeness -digital citizenship
  • The developed strength of the concrete can be determined on site by non-destructive testing (NDT) prior to removal of the formwork.


Non-destructive concrete testing (NDT) for structural strength

  • Formwork removal: know the right time and precautions (9)

    Ritesh Patel

    (Video) When Should Formwork Be Removed Deshuttering Period of Slab Beam Column and Footing

  • February 26, 2017

  • Formwork columns for internal walls are only removed when it is certain that they can withstand their own weight and external loads.
  • Quality engineers should inspect the site before starting to remove the formwork.
  • Workers must have safe access before formwork is removed.
  • Particular attention must be paid to damage caused by freezing andcracks in the concretedue to thermal contractions during formwork removal. If this risk exists, the withdrawal time may be delayed. Timely removal of formwork can be done if we plan and insulate the structure so that they are not exposed to such damage. This is especially common when pouring in cold weather.
  • The stroke time of a structure is determined by the resistance achieved or by non-destructive tests.
  • Formwork parts and associated units must be arranged so that removal is easy. This will help reduce damage to the concrete.
  • Only careful removal of formwork panels will help to reuse them.
  • The formwork removal procedure must be properly supervised by an installer. Good quality concrete will be free of honeycombs and cracks. If there is a fault, repair work can be carried out immediately.


Materials for repairing concrete structures

  • Formwork removal: know the right time and precautions (11)

    Ritesh Patel

  • February 21, 2017

    (Video) Staging and Shuttering removal time of Slab Beam Column and Wall | House Construction Step- 25

  • The removal of the forms must be done sequentially and in accordance with the approval of the responsible yard.
  • To separate the formwork, use wooden wedges and not the crowbar.
  • Until all supporting elements are permanently removed, the bottom of beams and joists must remain intact.
  • Removal of the formwork must not cause damage to concrete surfaces, especially corners and edges. Once the removal process is complete, cover exposed surfaces with plastic bags or wet bags so that the concrete is fully cured.
  • To speed up construction, slabs are sometimes poured on top of each other, leaving the formwork of another slab underneath. that is, in such cases the plate from which the stirrups were removed must bear not only its own load, but also the load due to a plate above which has not yet hardened and reached its full strength. In such cases, always follow the manufacturer's instructions.

What would happen if the formwork was removed prematurely?

(a) Early removal of side supports:

If you immediately remove the formwork from columns and beams, the sides may bulge if the concrete has not set. The sides can come out crooked or perpendicular. Again, due to the loss of sides, the water will immediately evaporate and you must start curing immediately.


Why does it take more water to harden than to make concrete?

  • Formwork removal: know the right time and precautions (13)

    Ritesh Patel

  • 24 January 2019

(b) Early removal of supports:

The building may bend or even collapse if it is not strong enough. Please note that if deviations occur on these occasions, they will remain permanent and difficult to repair. So be careful.


Formwork Safety Checklist

Formwork removal: know the right time and precautions (14)

The following are the requirements for the formwork safety checklist:
01.The formwork is designed for the structural element in question. The working drawing of the same must be present at the site.
02.The strength of the elements used as formwork must be sufficient to withstand both the structural load and the applied load.
03.When designing the formwork, all loads must be taken into account, including those that occur during the casting process.
04.The dimensioning of the formwork must take into account casting speed, casting height, sequence, temperatures and casting plane.
05.When designing the formwork, the safe bearing capacity of the soil must be taken into account.
06.The working drawing must contain detailed dimensions of the compaction gap and clearance.
07.All props must be checked. They must rest on support plates.
08.Defective props must be removed.

Politeness -any China

Formwork formwork must be done at the right time to avoid poor construction quality. When pouring concrete, the above precautions for removing formwork must be followed. Otherwise, concrete structural elements may crack or collapse or fail to achieve the required strength.
After all, if you are looking for specialized services for your concrete structures, you can also choosequality formwork contractors.

Also read:


What precautions are to be taken while removing the formwork? ›

  • The removal of formwork has to be done sequentially and in a pattern with the approval of the site in-charge.
  • Wooden wedges must be used to separate the forms and not the crowbars.
  • Until the final removal of all the shoring units, the beam and joist bottoms should remain as such.

What is the correct sequence for formwork removement? ›

The concrete should be removed first. Shuttering forming soffit to slabs should be removed next. Shuttering forming soffit of beams, girders or other heavily loaded shuttering should be removed in the end.

How to determine when it is safe to remove concrete formwork? ›

After pouring and finishing the slab, you should wait 24-48 hours before removing concrete forms. You can remove the formwork once the concrete has enough strength to keep it from cracking. Concrete naturally contracts as it cures, so it should pull away from the forms and make them easier to remove.

What would happen if formwork is removed early? ›

What Happens If The Formwork Removed Early? if you remove formwork immediately, the columns and beams sides may bulge if the concrete has not hardened. And sides may go out of plumb or line. If you do not get enough strength, the system may be distracted or collapse.

Which factors should be considered while deciding the stripping time of formwork? ›

The time required before formwork removal depends on the structural function of the member and the rate of strength gain of the concrete. The grade of concrete, type of cement, water/cement ratio, temperature during curing etc. influence the rate of strength gain of concrete.

What are the hazards of stripping formwork? ›

Sharp edges on formwork, protruding nails, snap ties, conduit, and bolts can cause pinches, cuts, scrapes, abrasions, and other injuries. Protruding rebar can cause cuts, abrasions, and impalement.

What is the correct sequence of construction? ›

The major sequences of construction are marking, excavation, concreting, brick masonry, roof laying, flooring and finishing.

What are the three stages of formwork? ›

There are three stages in formwork operations: 1. Assembly and erection 2. Concrete placement 3. Stripping and dismantling.

How soon can formwork be removed? ›

Walls and columns can be removed after about 24-48 hours

Slabs, with their props left under them, can typically be removed after 3-4 days. Soffits, with their props left under them, can be removed after one week. Props supporting slabs under 15 feet can be removed after one week.

Can you wait too long to remove concrete forms? ›

Remove the forms too soon, and the structure or finished product can be ruined. Remove them too late, and the concrete will get too hard to properly finish. Most concrete forms can be removed after 24-48 hours of curing. However, for some large structural builds, forms can stay on for over a week.

What are the precautions to be taken while placing the concrete in formwork? ›

Safety Precautions for Working With Concrete
  • Wear the Appropriate Personal Protective Equipment (PPE) ...
  • Use the Proper Tools. ...
  • Employ the Proper Techniques. ...
  • Have Washing Stations Available. ...
  • Wear Additional PPE. ...
  • Exercise Caution Around Concrete Buckets and in Mixers. ...
  • Communicate Proactively With Your Team. ...
  • Stay Alert and Vigilant.
Oct 29, 2021

What is the minimum period before striking formwork? ›

Type of FormworkMinimum Period Before Striking Formwork
Vertical formwork to columns, walls, beams.16 - 24 h (1 Day)
Soffit formwork to slabs3 days
Soffit formwork to beams7 days
Props to slabs a. Spanning up to 4.5 m b. Spanning over 4.5 m7 days 14 days
1 more row
Apr 10, 2023

How long does it take for 2 inches of concrete to cure? ›

The general rule of thumb is that concrete takes about 28 days to dry for every inch of slab thickness. Within 24 to 48 hours, the concrete will be ready for foot traffic.

How long does formwork need to support the concrete? ›

Removing formwork

When the concrete has enough strength to support the weight it must bear (seven days) strip the forms away. Do not use a metal tool against the surface to pry off forms because you may cause damage.

Can formwork usually be stripped five days after the concrete pour? ›

Concrete formwork striking times

Walls, columns and other vertical formwork can usually be removed after 24 to 48 hours. If you're using fast-drying cement, this could be as soon as 12 hours. For concrete slabs, formwork can usually be removed after 3 days and props after 2 weeks.

What are the checks that must be carried out on reinforcement and formwork before placing concrete for a RC slab? ›

Checks for Fixing Reinforcements in Formworks
  • Check for Formwork Condition.
  • Checking Condition of Reinforcement.
  • Checking Steel Bar Accuracy in Bending.
  • Checking Installation of Services.
  • Checking Joints and Dowel Bars.
  • Check Reinforcement from Previous Works.
Feb 20, 2018

What is safe work method statement for installing formwork? ›

A formwork safe work method statement (SWMS) is one of the backbone pieces of formwork documentation. Your work method statement - which you can see an example of to the right - enables you to properly document how your projects, teams and workers approach formwork operations in a safe manner.

What are the factors affecting formwork? ›

It consumes time in decision making based on the site constraints, availability and cost of the project. These are different factors which affects the formwork system selection.

What are 4 principles of good formwork? ›

Formwork should be:
  • rigid, watertight, braced and tied together to maintain position and shape during construction , and.
  • able to be removed easily and safely without damaging the formed concrete, or have components that remain as part of the finished structure so the rest can be removed without damaging the structure.

What are the basic principles of formwork? ›

Three general principles govern formwork design and construction: Quality accuracy of the concrete shape and the final finished surface quality. Safety strength of the formwork structure. Personal safety of people, both carpenters and the public.

What is a good formwork should satisfy the following requirements? ›

1. It should be strong enough to withstand all types of dead and live loads. 2. It should be rigidly constructed and efficiently propped and braced both horizontally and vertically, so as to retain its shape.

What are the 7 steps of construction? ›

Here's the process:
  • Step 1: Design. During this phase, the client places a project for bidding. ...
  • Step 2: Pre-Construction. ...
  • Step 3: Procurement. ...
  • Step 4: Construction. ...
  • Step 5: Commissioning. ...
  • Step 6: Owner Occupancy. ...
  • Step 7: Project Closeout.

What are the 5 steps of construction? ›

The five phases of the construction project lifecycle are:
  • Project Initiation and Conception. Like with all things, the first step to the construction life cycle is merely to begin. ...
  • Project Planning and Definition. ...
  • Project Execution and Launch. ...
  • Project Performance. ...
  • Project Close.

What are the 6 stages of construction? ›

Phases of construction
  • Phase 1. Closure of the building site. ...
  • Phase 2. Land and foundation. ...
  • Phase 3. The structure of the construction. ...
  • Phase 4. Mechanical, Electrical, and Plumbing (MEP) ...
  • Phase 5. Insulation and waterproofing. ...
  • Phase 6. Finishes and closures.

What are 2 types of formwork? ›

The main types of formwork systems in use now are: System column formwork. Horizontal panel.

Does formwork go first or rebar? ›

First check formwork before you allow placing of reinforcement. This is necessary as certain formwork defects can't be corrected or are difficult to correct after reinforcement is placed in position.

Is code for form work? ›

2.2.2 Steel Formwork

Steel sheet plates conforming to IS 2062 or IS 8500 or IS 1977 may be used for form lining and rolled sections and tubes conforming to IS 2062 or IS 8500 or IS 1161 may be used for steel forming and bracings.

What happens if curing is not done? ›

Improper curing reduces the strength gain in concrete both at the early stages and in long term. The formation of early cracking in the concrete surface leads to the ingress of moisture and other harmful compounds and low strength gain.

What is minimum curing period? ›

For the majority of concrete structures, the minimum curing period at temperatures higher than 5°C is seven days or until the concrete strength reaches 70% of specified compressive or flexural strength, as per ACI 308.1R. It is possible to decline the curing period to three days if high-early strength concrete is used.

How many times curing should be done? ›

Slabs & Wall Curing

For walls proper water curing should be done, at least three times a day. For pillars it should be covered with Gunny or strand and it should be always in wet condition.

How long does concrete continue to get hard? ›

By seven days, your concrete should be cured to at least 70 percent of its full strength. You will probably be able to drive on it without damaging it, although you may want to hold off on rolling heavy equipment over it. In 28 days, you can treat your concrete as fully hardened.

When can I put furniture on new concrete? ›

Once the concrete is poured the curing process begins immediately. To protect your new slab and ensure an exceptional finished product you should wait 24 hours for foot traffic (including pets), 10 days to drive light vehicles or add furniture, and 28 days for heavy pick-up trucks and RVs.

How much weight can a 6 inch concrete driveway hold? ›

How Much Weight Can a Concrete Driveway Hold? Typically, concrete driveways that are 4″ thick can withstand loads of regular vehicles, which is approximately 8,000 pounds. A 6″ thick concrete driveway can withstand heavy-duty trucks that can around weigh about 70,000 pounds.

How can formwork failure be prevented? ›

9 Ways to Prevent Concrete Formwork Fails
  1. Use pre-fabricated formwork if possible. ...
  2. Make sure the formwork is strong enough for the job. ...
  3. Take caution with older formwork. ...
  4. Secure the formwork in place. ...
  5. Inspect once in place. ...
  6. Ensure that all components are properly connected. ...
  7. Don't remove formwork too early.

How long should concrete set before removing forms? ›

After pouring and finishing the slab, you should wait 24-48 hours before removing concrete forms. You can remove the formwork once the concrete has enough strength to keep it from cracking. Concrete naturally contracts as it cures, so it should pull away from the forms and make them easier to remove.

Is code for formwork removal? ›

De shuttering period relates to the maturity of concrete and depends on the ambient temperature. Forms shall not struck until the concrete has reached strength at least twice the stress of which the concrete may be subjected at the time of removal of form work.

Is it OK if it rains after pouring concrete? ›

Freshly placed concrete should be protected from rain for at least 12 hours from its placement. After that, the rainfall rarely influences concrete properties.

How can I speed up my concrete curing? ›

How to Speed Up Concrete Drying
  1. Weather is a factor. If your concrete is exposed to the elements, you won't be surprised to learn that the concrete will dry faster in warmer, sunnier conditions. ...
  2. Using a heater. ...
  3. Using warm water. ...
  4. Reducing the amount of water. ...
  5. Avoid hard trowelling.

Should you water concrete after it is poured? ›

Many construction specialists recommend watering it down five to ten times per day, for the first week, starting 2-4 hours after it has been poured. The first two to four hours lets the concrete “finish”, which refers to the setting process.

What happens if you don't water concrete? ›

If you do not do watering of the concrete, the poured concrete will not develop the strength what was expected to achieve within 28 days. The loss of strength will invite repairs related to the restoration of strength.

Can I use 2x4 for concrete forms? ›

You can use 2- x 4-inch boards for concrete forms as long as the slab is not too thick. If the finished concrete slab will have visible edges, make sure the fasteners do not pass through the boards and into the concrete. Framework for a 12-inch concrete slab should have stakes no more than 24 inches apart.

What precautions should be taken when erecting formwork and shoring? ›

Follow the engineer's design drawings when erecting or dismantling formwork and shoring and reshoring. Wear personal protective equipment to protect you from falling objects, falls, and prevent contact with machinery, components or tools.

How do you remove formwork from concrete? ›

Forms can be pulled away from the sides of the concrete slab with the use of minimum strength, but if a form becomes challenging to remove then a pry bar helps to loosen the form in the concrete when pried upwards from the ground.

What precautions should be taken during the curing of concrete? ›

For proper curing concrete needs moisture. Continuity in curing is a must; alterations of wetting and drying promote the development of cracking. If during curing the concrete is allowed to dry out - as may happen in hot weather - the chemical stops right at the point where the concrete loses its moisture.

What are the precautions to be taken before during and after concreting? ›

Following precautions should be taken while placing concrete.
  • Concrete should be laid continuously to avoid irregular and unsightly lines.
  • To avoid sticking of concrete, formwork should be oiled before concreting.
  • While placing concrete, the position of formwork and reinforcement should not get disturbed.
Jan 30, 2018

How can you ensure that you are taking adequate safety precautions while using construction tools? ›

Keeping safety at the forefront, here are five construction safety tips to follow to help keep craft professionals in the construction industry safe each day.
  1. Identify potential hazards. ...
  2. Don't ignore essential safety equipment. ...
  3. Trust safety managers. ...
  4. Continue safety training. ...
  5. Utilize mobile technology.

What safety precautions should be observed during a visit to a building construction site? ›

Safety Precautions to Take While Visiting a Construction Site
  • Wear a hardhat. ...
  • Wear a high visibility vest. ...
  • Wear appropriate footwear. ...
  • Wear safety glasses. ...
  • Wear long pants to cover your legs. ...
  • If you have a guide, be sure to stay close to them as you move around the site. ...
  • Be aware of your surroundings. ...
  • Do not touch anything.
Feb 1, 2019

What are the precautions to be taken while constructing beams? ›

It should not be bent.
  • Joints of beam bottom should be properly propped so that formwork doesn't bulge during concreting.
  • Before providing beam sides, level of the beam bottom should be checked.
  • After levelling of beam bottom bracing should be provided.
Aug 13, 2016

What is the curing time for concrete? ›

Concrete typically takes 24 to 48 hours to dry enough for you to walk or drive on it. However, concrete drying is a continuous and fluid event, and usually reaches its full effective strength after about 28 days.

When formwork can be removed from cast in place concrete? ›

Removal of formwork.

Reshoring shall not be removed until the concrete being supported has attained adequate strength to support its weight and all loads in place upon it.


1. Shuttering Removal Time for Slab beam column & Slab ko kitne din pani dena chahiy? deshuttering time
(Tec Civil)
2. Period of Removing Formwork For Beams Bottom & Slab Bottom
(Civil Engineering)
3. Formwork Safety | Formwork Hazards & Control Measures | Shuttering/Deshuttering Hazards & Precaution
4. Remove the Forms After Pouring Slab Foundation
(DIY Concrete)
5. Does Early Form Removal Impact Concrete Durability?
(Tyler Ley)
6. Shuttering Removal Time for slab and how many days you curing should done..
(Construction Zone)


Top Articles
Latest Posts
Article information

Author: Kelle Weber

Last Updated: 19/08/2023

Views: 5560

Rating: 4.2 / 5 (53 voted)

Reviews: 92% of readers found this page helpful

Author information

Name: Kelle Weber

Birthday: 2000-08-05

Address: 6796 Juan Square, Markfort, MN 58988

Phone: +8215934114615

Job: Hospitality Director

Hobby: tabletop games, Foreign language learning, Leather crafting, Horseback riding, Swimming, Knapping, Handball

Introduction: My name is Kelle Weber, I am a magnificent, enchanting, fair, joyous, light, determined, joyous person who loves writing and wants to share my knowledge and understanding with you.