Ordering Steel Frames for Retrofit and Renovation Projects

Why Retrofit Frames Need Careful Planning

When you reinforce or extend an existing building, the steel frame has to fit a structure that already exists. Walls may be out of plumb, openings may differ by several centimeters from the plans, and the original construction may not match any drawing you have. Planning around these realities saves time and rework.

Start by confirming the purpose of the frame. A frame that supports a new floor load is different from one that only adds lateral stability or frames a new opening. Clarifying the role of the steel early shapes every decision that follows.

Measuring the Existing Structure

Accurate measurement is the foundation of a good retrofit. Measure each opening at several heights and widths, and note any diagonal differences that reveal out-of-square conditions. Record the thickness of walls, the position of beams, and any services such as pipes or cables that the frame must avoid.

• Measure at top, middle and bottom of every opening
• Photograph each area from several angles
• Mark the level of existing floors and thresholds

Preparing Drawings and Specifications

A clear drawing turns site measurements into a buildable product. It should show the frame dimensions, profile sizes, connection details, fixing points and finish. A written specification complements the drawing by listing materials, surface treatment and installation notes, so that nothing is left to interpretation.

Ask for drawings to be reviewed and approved in writing before production starts. Changes made after cutting steel are costly, so a sign-off step protects both the client and the manufacturer.

Structural Checks and Engineering Input

Where a frame carries loads or connects to existing structure, a structural engineer should confirm the design. The engineer checks profile strength, fixing into concrete or masonry, and how the new steel shares loads with the old building. Exact design values depend on the project, so they should always come from the engineer rather than from general rules of thumb.

For railings and guardrails, the Israeli standard SI 1142 applies. Confirm the requirements with your engineer for each specific case.

Finishing, Production and Protection

Steel used outdoors or in humid areas needs protection. Hot-dip galvanizing gives strong corrosion resistance for structural elements, and powder coating adds a durable color finish. Decide on the finish before ordering so that the drawing and the production schedule include it.

Production happens in the factory, where cutting, welding and finishing can be controlled more precisely than on site. Pre-fabricated frames arrive ready to fix, reducing noise, dust and time spent on the building site.

Installation and Coordination on Site

Installation goes smoothly when the team coordinates with the other trades. Confirm the sequence with the contractor: whether the frame goes in before or after plastering, tiling or window installation, and who handles temporary support. Check levels and fixings as each element is set.

• Agree the installation date with the site manager
• Protect finished surfaces during fixing
• Inspect the frame against the approved drawing before closing up walls

Frequently asked questions

How long before installation should I order a retrofit steel frame?

Order once the drawings are approved and the site measurements are confirmed, leaving time for production and finishing. Allow extra time if the frame needs galvanizing or a special color.

Do I need an engineer for a simple steel frame?

Any frame that carries load or fixes into existing structure should be checked by a structural engineer. Decorative elements with no structural role may need less review, but confirm with your contractor.

What if the existing wall is not straight?

Measure the wall in several places and send the results with photos. The drawing can then account for the irregularity through adjusted dimensions or packing at fixing points.

Can a steel frame be fitted without removing the old wall?

Often yes, with the frame fixed to the existing masonry or concrete using suitable anchors. The engineer determines whether the fixings and the wall can carry the planned load.

Common mistakes to avoid

The most common mistake is ordering from rough measurements taken without checking for out-of-square openings. Skipping the written drawing approval is another frequent error, since changes after production are expensive.

Our recommendation

Measure every opening at several points, photograph the surroundings, and have the engineer review the drawing before any steel is cut. This single step prevents most retrofit problems.

Summary

Accurate measurement, an approved drawing, engineering review and the right finish are the keys to a successful steel frame retrofit. Planning these steps in order keeps installation simple and predictable.

Related guides

• Final Acceptance Checklist for Delivered Steel Frames
• Compliance With Israeli Standards for Steel Structures
• How to Choose Structural Steel Grade for a Balcony Frame in Israel
• Environmental Conditions That Affect Steel Frame Selection
• Galvanized vs Painted Steel Frames for Coastal Humidity Exposure
• Steel Frame Maintenance Expectations and What to Ask
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