Formwork Tie Strap / Wall Tie Band – Alborz Ghaleb Factory Direct

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Formwork Tie Strap / Wall Tie Band for Shear Wall Formwork

The formwork tie strap (also known as wall tie band, tie belt, or punched tie strap) is one of the most essential formwork accessories that replaces full-thread bolts in shear wall and concrete column formwork. Manufactured at Alborz Ghaleb Industrial Complex in Karaj, Iran, using ST37 steel sheet with 2mm thickness and 28mm width, this product is available for domestic and export markets including Iraq, Armenia, Russia, and the Gulf region. The tie strap connects with pin and wedge, restraining lateral concrete pressure without drilling the formwork panels.

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What Is a Formwork Tie Strap and Why Is It Important?

The formwork tie strap — known by various names including wall tie strap, tie belt, concrete form tie band, and punched tie strap — is a narrow flat steel strip made of ST37 steel with elongated rectangular punched slots at both ends. It is placed between two steel formwork panels and, by passing pin and wedge through the elongated slots and the panel edge holes, connects both sides of the formwork together — preventing the panels from opening apart under concrete pouring pressure.

Traditionally, shear wall formwork used full-thread bolts with wing nuts and washers that had to pass through the center holes of the formwork. This required drilling formwork panels, using scaffolding tubes or soldiers, and more labor — significantly slowing down execution. Today, the formwork tie strap has replaced bolts, providing safe and rapid restraint without any holes in the formwork.

The importance of the wall tie strap lies in its ability to prevent wall bulging and thinning, maintain precise spacing between formwork faces, and control lateral concrete pressure. For shear wall formwork projects where concrete surface quality and execution speed matter, the tie strap is the best choice.

Technical Specifications of Formwork Tie Strap / Punched Tie Band

This tie strap is produced from ST37 steel sheet with 2mm thickness and 28mm width, in various lengths depending on wall thickness. It features 2 elongated rectangular punched slots (oblong punch-cut shape) — one elongated slot at each end — used for connecting to formwork panels by passing pin and wedge through the slot and the panel edge hole simultaneously. The elongated shape of the slots allows easier pin insertion and creates a stronger connection point. The tie strap is positioned between the outer edges of two opposing formwork panels, holding them together to prevent separation under concrete pressure.

Key Advantages of Formwork Tie Straps

• Significant reduction in execution time: Eliminating the drilling and bolt-passing stage increases formwork speed by up to 40%.
• Reduced labor costs: Removing scaffolding tubes and soldiers means fewer workers and lighter work.
• Precise formwork spacing: The tie strap acts as a tie, maintaining the exact distance between formwork faces.
• Prevention of wall bulging: Steel resistance against lateral concrete pressure prevents deformation.
• Prevention of wall thinning: The tie strap prevents concrete migration and void formation.
• Reduced height work hazards: Eliminating heavy tube transport improves worker safety.
• Extended formwork lifespan: No drilling means formwork panels remain intact.
• No concrete hole repair needed: Unlike bolts, tie straps leave no holes to patch.
• Simplicity and ease of use: Pin and wedge installation is far simpler than bolt tightening.

Formwork Tie Strap Models – Alborz Ghaleb Production

Tie Strap 30–50 cm

Suitable for shear walls 20–40 cm thick. The most commonly used size in residential and commercial projects.

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Tie Strap 55–80 cm

For shear walls and concrete columns 45–70 cm thick. Standard for medium to large projects.

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Tie Strap 85–120 cm

For thick walls and large columns 75–110 cm. Custom lengths available on order.

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Types of Formwork Tie Straps by Length

1. Tie Strap 30–50 cm (Thin and Medium Walls)

Suitable for shear walls with 20–40 cm thickness and restraining concrete columns up to 40 cm wide. The most widely used size in residential and commercial projects.

2. Tie Strap 55–80 cm (Medium Walls and Columns)

Suitable for shear walls and concrete columns with 45–70 cm thickness. Standard for medium to large projects.

3. Tie Strap 85–120 cm (Thick Walls and Large Columns)

Designed for thick walls and large columns with 75–110 cm thickness. Custom length production is available.

4. Custom Length Tie Strap

Alborz Ghaleb can produce tie straps in any custom length from 20 to over 120 cm. Custom lengths for special column or wall dimensions are produced in minimal time.

Formwork Tie Strap Pricing

The price of the formwork tie strap varies based on the required length for the steel formwork, and the unit of measurement is the centimeter. The current price is $0.07 USD per centimeter. For example, for a 20 cm wall with 5 cm formwork edge on each side, you need a 30 cm strap: 30 × $0.07 = $2.10 USD.

One reason contractors get confused about pricing is the different prices quoted. The main cause of price variation is the use of steel sheets with different thicknesses. Sheets from 1.8mm to 2mm are used for production. However, as mentioned, we recommend using 2mm / 2.8cm straps only.

The following factors affect the final price:

• Strap length: Longer straps cost more. Calculated per centimeter.
• Steel thickness: 1.8mm is cheaper, 2mm is standard and recommended.
• Cut width: The strap is produced ONLY in 28mm width.
• Steel type: Mobarakeh Steel and Kaveh Steel with different quality and price.
• Market fluctuation: Directly tied to daily steel prices.
• Order quantity: Bulk orders receive special discounts.

Formwork Tie Strap Price List

Price list of tie straps produced at Alborz Ghaleb, available in custom lengths and produced in minimal time for connection to steel formwork:

How to Calculate the Correct Tie Strap Length

The formula for calculating the required tie strap length is based on wall width. For formwork with 5 cm edges, add 10 cm to the wall thickness. For 6 cm edges, add 12 cm.

For example, if the wall is 30 cm thick with 5 cm formwork edges, the required strap length is 40 cm. The 10 cm allowance is for pin and wedge connection on both sides.

As mentioned above, tie straps are used where drilling formwork panels is not possible. However, we also recommend using this method in other cases, because tie straps not only reduce costs but also significantly speed up wall formwork, and by eliminating the need for drilling, extend the life of your formwork panels.

Technical Checklist Before Purchasing

Project-Based Selection Guide

Proper Spacing of Formwork Tie Straps

After rebar placement and spacer installation, begin formwork. Place the first tie strap 25 cm from the floor and pass the pin and wedge through it. Then place the second strap 25 cm from the top edge and secure the wedge firmly. For taller formwork, add intermediate straps at maximum 50 cm spacing.

Formwork Tie Strap Installation Guide – Step by Step

Proper installation of formwork tie straps is critically important. If not installed correctly, shear walls may bulge, thin out, or the formwork may shift during concrete pouring — creating serious safety hazards. The tie strap is placed between two opposing formwork panels; its elongated slots align with the panel edge holes, and pins pass through both the slot and the panel hole, secured with wedges to hold the panels firmly together under concrete pressure.

1. Prepare the site and check tools: Before starting formwork, ensure you have pins, wedges, a hammer, spirit level, and plumb line ready. The work surface should be clean and free of debris.
2. Inspect all tie straps: Check each strap for proper elongated punched slots (one slot at each end), no bends or rust. Straighten or replace any bent straps.
3. Calculate and select the correct length: Using the formula (wall thickness + 10 cm for 5 cm edge / + 12 cm for 6 cm edge), calculate the required strap length.
4. Install the first strap 25 cm from the floor: After rebar placement and spacer installation, begin formwork. Place the first tie strap 25 cm from the floor between the two panels. Pass the pin and wedge through the elongated slot and the panel edge hole.
5. Install the top strap 25 cm from the top edge: Place the second strap 25 cm from the top edge and secure the wedge firmly. For taller formwork, add intermediate straps at maximum 50 cm spacing.
6. Plumb and level precisely: Using a spirit level and adjustable shore jack, ensure formwork is perfectly plumb and level.
7. Final check before pouring: Before concrete placement, tap all wedges firmly with a hammer. Pull each strap by hand to confirm it is secured.
8. Monitor during concrete pouring: While pouring, watch the straps and wedges. If you see grout leaking or wedges loosening, take immediate action.

Required Tools:

• Standard pin and wedge set
• 1–2 kg hammer
• Spirit level (bubble or laser)
• Plumb line
• Work gloves

Safety Notes During Installation:

• Wedges must be tight: Loose wedges can cause formwork to open during concrete pouring.
• Use standard pins and wedges only: Non-standard pins may break under concrete pressure.
• Maintain 25 cm spacing from floor and ceiling: Not maintaining this spacing weakens restraint at critical points.
• Do not use bent or rusted straps: Damaged straps have significantly reduced strength.

Common Installation Mistakes:

• Wrong length calculation: Forgetting to add formwork edge allowance (10 or 12 cm) to wall thickness.
• Not maintaining 25 cm floor spacing: Insufficient restraint at the base causes wall bulging.
• Using straps thinner or thicker than 2mm: Some contractors use 1.8mm straps to cut costs, which lack sufficient strength. Conversely, using straps thicker than 2mm causes concrete grout leakage from formwork joints. Always use 2mm straps.

Applications of Formwork Tie Straps

Maintenance and Long-Term Safety Tips

• Store in dry conditions: Steel straps rust when exposed to moisture. Store indoors in a dry warehouse.
• Prevent bending: Store straps flat and stacked. Bending reduces strength and makes pin insertion difficult.
• Inspect before each use: Check punched slots. If slots are deformed, replace the strap.
• Clean after each project: Remove concrete residue immediately after stripping formwork to prevent corrosion.
• Do not reuse damaged straps: Straps that have deformed under pressure should be recycled.
• Wear work gloves: Strap edges may be sharp. Always use appropriate gloves.
• Safe transportation: Transport straps in organized, packaged bundles to prevent damage and accidents.

Complementary Formwork Equipment at Alborz Ghaleb

For complete and professional formwork execution, order your formwork tie straps along with crosshead prop jacks and modular steel formwork. For heavy temporary structures, Alborz Ghaleb modular scaffolding is the best choice. Connection accessories like pin and wedge are available in the formwork equipment section. For rebar work, rebar cutting machines are also available. For wall restraint, don't forget walers.

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Frequently Asked Questions About Formwork Tie Straps