Secret fix

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What is a Secret Fix roof?

Secret Fix systems involve the mechanical fixing through the underlap of the profile into the roof structure, which is then covered over by the overlap of the profile. This removes any chance of leaks through the roof sheets as all penetrations are protected from weathering. SF500 provides superb weathering performance through a precision engineered snap fit 55mm overlap. The underlap is designed to take a 3mm bead mastic seal, whilst the low profile pan allows excellent drainage at low pitch. Single eaves-to-eaves or ridge-to-eaves sheet lengths with no end laps and no external fixings penetrating the sheet, along with on-site manufacture, means that sheet lengths are effectively limited only by handling requirements.

Why choose a Secret Fix Roof System?

SF500 gives the specifier and contractor a proven and simple system to use for low pitch roof applications where speed of fixing and guaranteed performance is paramount. These attributes are complemented by the continuity of finish, colour and material choice. Elite System 3 has low visual impact, allowing clean uncluttered rooflines. Carefully designed accessories and details ensure no compromise of performance. The structurally tested system and longevity of materials provide long-term security and Corus Colorcoat HPS200 Ultra® is maintenancefree for up to 40 years with the Confidex® Guarantee.

System Performance

Manufactured predominantly in Corus Colorcoat HPS200 Ultra® prefinished steel, the system offers many of the advantages of a true standing seam system, but is simpler to install and may be more simply integrated into projects where the material of choice is steel rather than aluminium. Sheets can be rollformed on site, therefore long lengths, eaves to eaves are possible giving excellent watertight covering. The SF500 sheet can also self curve to a 50 convex metre radius. Carefully designed accessories and details ensure no compromise of performance. The structurally - tested system and longevity of materials provide long-term security.

Acoustic Benefits

Our typical twin skin standing seam roof with a 0.7mm liner, insulation to achieve 0.25 U value and 0.9mm aluminium standing seam will give a sound reduction of 44.2db. If part of your design brief is to reduce noise by a value greater than 44.2dB, then this can be achieved by simply adding mass to the construction. There are a variety of ways that this can be achieved; one way is to increase the gauge of the liner from 0.7mm to 0.9mm.
If you give us an SRi target to achieve, we will endeavor to provide a compliant construction which achieve your design criteria over the octave range.
Sound absorption systems are available to reduce the sound resonance in buildings such as sports halls and schools.

Regulation Compliance

All constructions are thermally modelled on software compliant to BS EN 10211/1 and 2, fully taking into account any thermal bridging through the systems to achieve the required U Value. Details of methods for showing compliance are available in the Goverments Approved Document itself, the MCRMA Technical Paper 14 and Euroclad's Construction Details book - 'psi' Values are availble for robust and bespoke details. NBS draft specifications are provided for standard constructions and can be tailored to suit project performance requirements through consultation. This service can utilise our experience and the flexibility of built-up systems, which can respond individually to your requirements for specific thermal, acoustic, structural and other performance considerations.

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