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ACM or ACP / Aluminium / Copper / Zinc / Stainless Steel / Steel (Mill)

Thermosash has the in-house capability to work with all the following materials and has extensively reinvested in equipment and staff training to ensure the highest quality workmanship is produced out of our workshops. If you require any further information on any of these materials, finishes or examples of work completed using these materials - please do not hesitate to contact us.

Thermosash undertake a lot of building envelope work using ACM (Aluminium Composite Material) also known as ACP (Aluminium Composite Panel) or MCM (Metal Composite Material) due to it being a highly versatile sheet product for both internal and external applications. The sheet is produced by continuously bonding two thin sheets of aluminium or metal on either side of an extruded thermoplastic or mineral-filled thermoplastic core. When the sandwich metal is aluminium they are generally pre-finished and coil-coated in a variety of high performance long lasting paint finishes before bonding. The sheet system offers the rigidity of heavy-gauge sheetmetal in a lightweight composite material.    Alternative metal surfaces are now available - offering varying linished metal finishes, stainless steel, natural copper, natural zinc, as well as high quality surface images of aged or patina metals, wood grains etc - offering long colour fast, durable finishes with similar warranty periods.

(Also refer ACM section)

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The predominant use of aluminium in the façade industry is due to the material's unique properties:  versatile, light weight, easily extruded into complex shapes, strong, low metal reactivity, self healing, non-corrosive, low maintenance and relatively low cost.

It is also used for all associated work with façades such as flashings and solar shading fins etc. 

Aluminium is easy to surface finish and can obtain long external use warranties with powder coating and anodising. It is important to consider dissimilar metal use on buildings, eg copper water shedding onto aluminium is not recommended.

We have undertaken large pressings from sheet aluminium offering easy integration with our systems.  Its light weight means that elements can be fixed off our curtainwall and its flexibility means almost any shape can be configured.

There are assorted grades of aluminium available that suit various final uses. Thermosash typically specify 6063-T5 alloy for structural members and 1200-5005 alloy H14 temper sheet for flashing elements. 

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Copper, due to its malleability and high durability, has been used in buildings for hundreds of years - although it should not be allowed to watershed over aluminium as it is likely to cause rapid degradation of the aluminium window frame.

Copper has been used predominantly for roofing and guttering in the building industry but is used more and more as a cladding on modern architecture. Whilst at Thermosash we have the sheetmetal skills in-house to work and fold sheet copper into your designs, it is now also available as a veneer skin over ACM which offers the strength of a bonded sandwich system with a natural metal appearance.

Copper will naturally weather  to a blue-green colour called verdigris.

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One of the oldest and arguably most sustainable metals due to its unique properties:  non-toxic, durable, 100% recyclable, in plentiful supply and with low energy production requirements.

Due to zinc's malleable nature it is easy to transform into architectural projects, especially  corners and unique curved projects, where other materials can be restrictive.

Thermosash have the in-house capability of sheetmetal workers who can fold and manufacture unique architectural building envelopes using this metal, amongst others.


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Stainless Steel
Stainless steel is widely used in the construction industry - not only in fixings and bracketry due to its resistance to corrosion but more and more for its architectural aesthetic. 

Contrary to the name, stainless steel is susceptible to staining in certain environments -particularly coastal or high humidity areas, where it will succumb to what appears to be a light surface coating of rust -  technically known as 'tea staining'.   This can be polished off, bringing the stainless steel back to its original finish but regular washing will also have a significant effect on reducing any staining.

There are many grades and surface finishes that are available pending on the environmental conditions it is expected to endure.

  • 304 - Is used predominantly internally, where the finish is not subjected to extreme internal environments.

  • 316 - Also called 'marine grade' used mostly for external applications or harsh internal environments.

  • 445M2 - Is said to have better atmospheric corrosion performance than 316, not only from a saline environment but also from the likes of high sulphuric rich environments such as geothermal power stations.

  • Decorative Finishes - There are many decorative finishes available in stainless steel, from linished, to embossed in tens of different finishes - including coloured stainless - which has no colour added - so has the same performance and durability and will never fade.

  • Mesh - Various mesh spacings and gradings are available - often used in our mechanical louvre systems to prevent foreign objects entering beyond the louvre screen.  It must be of high environmental durability to provide long lasting service in this building element.

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Steel - Mill (specials) - Thermosash undertakes the manufacturing of a lot of unique building components for integration into the building envelopes that we design. These may from time to time be manufactured from steel plate and galvanised. Our factory has the specialist equipment and personnel to undertake the bespoke engineering needed to complete your project including design engineers, water cutters, presses and specialist welding teams.