Tech Talk Tips


Stainless Steel Vs Zinc Coated Steel Mesh


Blue Mountain Mesh steel gutter guard is made from hot-dipped galvanised zinc-coated steel and is recommended for use on metal (including galvanised) and tile roofs.

Stainless steel mesh is often specified under the misconception that stainless steel is stronger and therefore will be a more effective product, without taking into consideration that if stainless steel mesh is installed onto a steel roof, galvanic corrosion will occur.  Galvanic corrosion (also called ‘dissimilar metal corrosion’) is an electrochemical process in which one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte, such as rainwater.  In the case where stainless steel mesh is being installed onto a steel roof, the stainless steel is a more cathodic or more noble material, and the zinc or zinc and aluminium coating (Zincalume) on the steel in the roof sheets is a more anodic or less noble material resulting in the zinc or zinc and aluminium coated steel roof sheet and steel gutter “sacrificing” themselves and corroding to “protect” the stainless steel mesh.

As zinc and zinc and aluminium (Zincalume) steel roofs and gutters are very common in Australia and stainless steel roofs are few and far between, it is not recommended that a stainless steel mesh is installed on steel roofs. If stainless steel is used it should be physically separated or, insulated from roof and gutter materials by using UV stable polymers or rubber strips between the two. Ideally gutter mesh materials will match (be made of similar materials) the roofing and gutter material so zinc coated steel or aluminium gutter mesh is preferred.

Blue Mountain Mesh steel gutter protection is built to last and to stand the test of time and we offer a 12 year guarantee.  Independent testing has revealed that Blue Mountain Mesh steel gutter protection can last as long as 60 years in moderate climates.

More information on galvanic corrosion can be found in the Blue Mountain Mesh Corrosion Information paper. Additional information on Cathodic Protection can be found on the Galvanizers Association of Australia website.


(Updated December 2014)


Steel or Aluminium?

There are a few factors to consider when choosing which mesh type of gutter guard to install.  Steel mesh is stronger, can be used on wider spans for box gutters, and should be used if there is evidence of any form of wildlife. If you need to be ember guard compliant, Blue Mountain Mesh 2mm steel Superfine mesh is the ideal choice.  Steel mesh is also custom made to order, and suits all roof and gutters types and is available in the full COLORBOND® colour range.  Aluminium mesh is a more flexible product that gives a satisfactory leaf / gutter guard result in most situations on tiled, corrugated or Trimdek® roofing.

(Updated November 2014)


Maintaining Your Gutters

If you have Blue Mountain Mesh gutter guard or ember guard installed on your home, there is no need to remove it to clean out your gutters.  Simply use a leaf blower to remove leaves and debris from on top of your roof and use a garden hose, through the mesh, to wash out any fine debris in the gutters.

(Updated October 2014)


Ember protection for ridge caps on metal roofs in Southern Australian states

In Victoria and other southern states, roofers do not scribe in the ridge capping. Scribing in the ridge capping is not required in these areas because of the lower wind ratings, but this leaves the appearance of gaps at every corrugation (this will occur with every type of metal roof, ie Corrugated, Custom Orb, Trimdek, Spandek, etc), which can cause an ember protection issue in bushfire prone areas.

If the appearance of gaps at the ridge capping is a concern, then providing the ends of the roof sheets are turned up and there is fire retardant wool under the ridge capping then effective ember protection will have been achieved.

(Updated September 2014)


Gutter Trim

When ordering steel or aluminium mesh, don’t forget to order the metal gutter trim.  It makes securing the mesh to the gutter edge so much easier, and is available in the full range of Colorbond® colours to match the gutter.  It ensures your installation looks neat, tidy and professionally finished.

(Updated August 2014)


Three Apertures

Blue Mountain Mesh steel gutter guard comes in three apertures:

Aperture refers to the opening between adjacent parallel wires (the size of the holes in the mesh).

2mm Superfine Mesh

+  Manufactured to Australian Standards AS3959-2009/Amdt2011 with proven compliance at all Bushfire Attack Levels.

+  AS3959-2009 compliant for non-combustibility

+  Ideal for use on properties that require ember guard protection or have trees with fine leaves (eg Jacaranda or leopard tree) and debris close by

4mm Super Mesh

+  AS3959-2009 compliant for non-combustibility

+  Ideal for medium size leaves and debris (e.g gum leaves and gum nuts, Chinese Elms)

+  Provides extra protection from hail and flooding rains during hailstorms

5.4mm Standard Mesh

+  AS3959-2009 compliant for non-combustibility

+  Strong, long lasting solution for keeping pests (e.g birds, possums, rats and snakes)

+  Ideal for keeping larger leaves and debris out of gutters

3 apertures

(Updated July 2014)


Joining rolls of mesh on the gutter

When joining rolls of mesh on a corrugated roof, make the join in the middle of a valley on the corrugations so the screws will not damage the roof surface.  If you are joining two pieces of mesh on a Trimdek roof, make the join at the top of the rib, similar to joining sheets.

(Updated June 2014)



Trimdek® Mesh Order

Ordering gutter guard for a Lysaght Trimdek® or Stramit Monoclad® roof

Trimdek® and Monoclad® Roof Sheets

When you need to order mesh to install onto a Trimdek® roof, your number one choice should be to order the mesh in sheets.  The sheets are pre-notched to suit Trimdek®/Monoclad®  and have a formed front edge.  Save yourself hours of work – the install procedure is much faster with the pre-notched sheets.  The sheets are 387mm wide and suit most Trimdek® and Monoclad® installations.

Similar to Trimdek® or Monoclad® Roof Sheets

When it comes to installing mesh onto roofs similar to a Trimdek® roof (eg. Klip-lok® or Superdek®), you need to be aware the spacing of the ribs are slightly different to a true Trimdek® roof sheet.  So for these installations you’ll need to order your mesh in a roll.  The mesh will need to be notched by hand as part of the installation procedure.

TRIMDEK® and KLIP-LOK® are registered trademarks of BlueScope Steel Limited
MONOCLAD® is a registered trademark of Stramit Corporation Pty Limited
SUPERDEK® is a registered trademark of Stratco (Australia) Pty Limited

(Updated May 2014)

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