Insulation Support Mesh for Roofing & Building Projects

Need to keep roofing insulation supported across a larger installation? Rally Specialty Wires currently focuses on galvanised insulation mesh, available in 1200mm & 1800mm widths to suit different coverage requirements across roofing & insulation work.

Both Rally Insulation Mesh options are supplied in 50m rolls with a 115mm x 100mm aperture & 1.47mm wire diameter. Rather than offering general-purpose tie wire or fencing wire, this collection is specifically built around mesh that helps hold roofing insulation securely in position.

Planning the surrounding roof system as well? Roofing Materials & Sealants provides complementary roofing materials, while Roofing Tools & Accessories covers equipment for associated roof installation work.

Width is the key choice here. 1200mm gives a narrower roll for compatible layouts, while 1800mm provides greater width per run. Confirm the supporting structure, insulation system, fixing method & required coverage before deciding which roll belongs on the job.

Two Widths, One Straightforward Choice

There's no need to sort through unrelated wire products in this collection.

Because the aperture, wire diameter & roll length remain consistent, selection largely comes down to which width best matches the installation layout.

What Is Rally Insulation Mesh?

Picture the layers of a roof before the cladding closes everything in.

Insulation needs to remain where the roof system requires it rather than being left without suitable support. Rally Insulation Mesh provides a galvanised wire mesh that is designed to help hold roofing insulation securely in place.

Rally specifies the product as medium-duty galvanised mesh that's strong, lightweight & easy to handle.

Its purpose is therefore much more specific than the collection name “Specialty Wires” might initially suggest.

This isn't a collection of tie wire, reinforcing wire or rural fencing wire. The products currently available are insulation support mesh for roofing & insulation applications.

1200mm Rally Insulation Mesh

Working with a layout where a narrower mesh roll makes sense?

The MWIM121151112550 provides a 1200mm-wide roll while retaining the same aperture, wire diameter & 50m length as the wider version.

1200mm Product Details

► Brand: Rally
► Product: Insulation Mesh
► Product code: MWIM121151112550
► Width: 1200mm
► Roll length: 50m
► Aperture: 115mm x 100mm
► Wire diameter: 1.47mm
► Finish: Galvanised
► Duty: Medium-duty
► Purpose: Helping support roofing insulation

The narrower format may make sense where the building layout or installation plan is better suited to 1200mm coverage.

Don't choose it purely because the roll is smaller. Compare the width against the actual support layout first.

1800mm Rally Insulation Mesh

More width per run can change how a larger installation is planned.

The MWIM181151112550 increases the roll width to 1800mm while keeping the 115mm x 100mm aperture, 1.47mm wire & 50m length.

1800mm Product Details

► Brand: Rally
► Product: Insulation Mesh
► Product code: MWIM181151112550
► Width: 1800mm
► Roll length: 50m
► Aperture: 115mm x 100mm
► Wire diameter: 1.47mm
► Finish: Galvanised
► Duty: Medium-duty
► Purpose: Helping support roofing insulation

For broader installation areas, the additional 600mm of width can provide greater coverage across each run.

That doesn't automatically make 1800mm the better choice. Handling, structure dimensions & the specified installation layout still matter.

1200mm vs 1800mm: Start With the Building Layout

The easiest purchasing mistake is treating width as a simple “bigger is better” decision.

Measure the intended runs before calculating quantity.

A width that works neatly with the structure can reduce unnecessary cutting, awkward joins & leftover material.

Insulation Mesh Isn't Tie Wire

“Specialty wire” covers a broad family of products, but the items on this collection perform a specific job.

Tie wire is generally supplied as individual wire for tying, binding or securing materials.

Insulation mesh is supplied as a mesh roll with defined apertures & width, providing a supporting surface for compatible insulation installations.

Those products shouldn't be treated as substitutes.

If the task is tying reinforcing bar, fastening mesh or making individual wire ties, these Rally Insulation Mesh rolls aren't the equivalent of a coil of tie wire.

Insulation Support Mesh Isn't Automatically Roof Safety Mesh

This distinction matters.

Rally describes these products as medium-duty insulation mesh designed to help hold roofing insulation in place.

Roof safety mesh used as part of a fall-protection system is a separate safety-critical product category with specific performance & installation requirements.

Don't assume insulation support mesh provides fall protection because it's installed within a roof assembly.

Unless the specific product documentation confirms the required safety classification, treat Rally Insulation Mesh according to its documented purpose: supporting compatible roofing insulation.

Where Can Rally Insulation Mesh Be Used?

The product is intended for roofing & insulation work where compatible insulation requires mesh support.

Relevant project environments can include:

► Roofing installations
► Building insulation projects
► Commercial construction
► Industrial building work
► Sheds & similar structures
► New roof construction
► Compatible refurbishment work
► Projects requiring insulation support beneath roof systems

Actual suitability depends on the building design, insulation product, structure & specified installation method.

The mesh shouldn't be assigned a structural, fall-protection or load-bearing role that hasn't been documented for the product.

Calculate Coverage Before the Roll Is Opened

A 50m roll tells you the length, but width changes the nominal area of mesh supplied.

Based on the stated dimensions:

► 1200mm x 50m: approximately 60m² of nominal roll area
► 1800mm x 50m: approximately 90m² of nominal roll area

Those figures describe the physical roll area only.

They aren't a final purchasing quantity because actual requirements can be affected by overlaps, trimming, building geometry, fixing details & waste.

Use the project layout to calculate the number of rolls rather than dividing the roof area by 60m² or 90m² & assuming the result is exact.

The Aperture Stays the Same

Width isn't the only dimension worth checking.

Both products use a 115mm x 100mm aperture.

That means moving from the 1200mm product to the 1800mm product doesn't mean choosing a different mesh opening. You're increasing overall roll width while retaining the listed aperture & 1.47mm wire diameter.

For procurement teams, that simplifies comparison considerably.

Once the specified mesh characteristics are confirmed, the remaining question is which width fits the installation plan.

Galvanised Finish: What It Does & Doesn't Tell You?

Rally specifies a galvanised finish for durability & corrosion resistance.

That's useful information when comparing mesh intended for building applications, but “galvanised” shouldn't be interpreted as indestructible.

Cutting, storage conditions, exposure, contact with incompatible materials & the surrounding building environment can all matter.

Keep rolls appropriately stored before installation & avoid unnecessary damage during handling.

Where corrosion exposure is a design consideration, follow the project specification rather than assuming any galvanised wire mesh suits every environment.

Before Installation, Check the Layers Around It

Insulation mesh doesn't work in isolation.

A roof assembly may involve structural framing, insulation, membranes or foil products, cladding, fasteners & other components specified as part of the building system.

Before installation begins, establish:

► Where the mesh sits in the specified roof build-up
► Which direction the rolls will run
► Required fixing points
► Any specified overlaps or joins
► How the insulation is positioned relative to the mesh
► How penetrations & edges are treated
► Whether the chosen width suits the supporting structure
► Whether other roofing components affect installation

For materials used elsewhere in the roof package, Weatherproofing Supplies can support compatible sealing & weather-management requirements.

Wider Rolls Can Reduce Runs, But That's Not the Whole Story

Consider a large rectangular area.

An 1800mm roll covers more width each time it's laid out than a 1200mm roll. That can mean fewer runs across a compatible installation.

Now consider a tighter area with different framing dimensions, obstacles or access constraints.

The narrower 1200mm roll may be easier to work into the planned layout.

That's why purchasing by square metres alone can be misleading.

Coverage, handling & fit need to be considered together.

Plan Around Penetrations Before Cutting

Roof penetrations interrupt otherwise straightforward runs.

Vents, ducts, services & other openings can affect how insulation support is arranged around the surrounding area.

Before cutting the mesh:

► Identify penetrations from the current drawings
► Check how the support system is intended to terminate around them
► Avoid unnecessary short offcuts
► Maintain the required support arrangement
► Coordinate mesh placement with the insulation installation

A few minutes spent planning the run can avoid turning useful 50m rolls into a collection of awkward pieces.

Keep the Roll Dry & Protected Before the Job Needs It

Site storage can be overlooked because wire mesh appears robust.

A better approach is to keep rolls protected from unnecessary contamination, standing water, site traffic & physical damage before they're required.

Check rolls before installation for:

► Distorted mesh
► Damaged wire
► Heavily affected finish
► Contamination
► Damage from transport or storage

If the product condition raises questions about suitability, resolve them before it's buried within the roof assembly.

Don't Confuse Three Different Mesh Jobs

Wire mesh terminology can become messy on a building project.

Insulation Mesh

Used here to help support compatible roofing insulation.

Reinforcing Mesh

Used within concrete reinforcement systems. It performs a fundamentally different construction function.

For concrete work, see Concrete Reinforcement.

Roof Safety Mesh

A safety-critical mesh category intended for specified roof fall-protection applications when the product & installation meet the applicable requirements.

The fact that all three products can be made from wire doesn't make them interchangeable.

Match the mesh to its documented job.

Five Questions to Answer Before Ordering

Instead of beginning with price per roll, run through the installation.

How wide is the required mesh run?
This helps determine whether 1200mm or 1800mm better fits the layout.

How much total area needs support?
Use dimensions from the actual project rather than an estimate based on building footprint alone.

What insulation system is being installed?
Confirm the mesh is suitable for the intended insulation arrangement.

How is the mesh specified to be fixed?
Installation requirements should come from the project or system documentation.

Is fall protection required from the mesh?
If yes, don't assume this insulation support mesh fulfils that role. Use the correctly specified safety system.

Useful Reading Before the Roof Closes In

Roofing work gets considerably harder to correct once subsequent layers cover an overlooked detail.

How To Choose Right Ladder Access Equipment covers considerations around choosing access equipment for work where height & positioning matter.

Heading into a larger construction period? Spring Jobsite Prep: Getting Your Gear Ready looks at preparing equipment before the workload ramps up.