Find answers to common questions here – these FAQS are designed to provide a better understanding of metal cladding building systems and their various applications.
If you cannot find the answer to your question here, please contact MCRMA on 01633 895633 or via the technical hotline.
Q1 How do you achieve air tightness using a built-up cladding system?
Q2 How should the outer sheet be sealed to prevent the ingress of water?
Built up system end lap detail (metal over GRP rooflight), three runs of butyl sealant
The position and size of butyl mastic seal in the overlap joints of outer sheets can have a significant effect on the overall performance and weather tightness of profiled roofing and cladding systems. The sealing strip is introduced into the lap to prevent the ingress of dirt and water from the weather side and to prevent the potential risk of condensate from entering the top of the lap from the inside.
The sealing strip or bead must be in full contact with both surfaces of the joint; it must be flexible enough to deform around the shape of the profile, resilient enough not to compress excessively under load and yet be flexible enough to withstand movement within the joint. The expansion characteristics of the sealant must be able to accommodate the full movement of the joint and therefore must be specified accordingly. It must also last the life of the building without degrading or cracking.
Q3 What is the correct method of installing insulation quilt?
Q4 What are spacer systems?
Q5 What is the minimum material thickness for external fabrications?
Q6 What is the correct specification for fasteners?
Q7 What are the loads and forces on individual fasteners?
Q8 What is the correct sequencing of composite panels to minimise gaps at junctions?
Q9 How much expansion should be allowed for when specifying aluminium flashings and profiles?
Q10 What factors do I need to consider when specifying surface coatings?
Q11 Who needs to consider the risks when there is a requirement to work at height?
Q12 When considering the need to work at height what measures should be taken to minimise the risk?
Q13 I am in the process of specifying fall protection equipment for a building. What additional questions should I ask of the supplier?
Q14 Are all industry guarantees, 'third party' guarantees, extended guarantees or warranties the same and what restrictions should I be aware of?
Q15 Will the adoption of deeper cladding system have an effect on the supporting structure?
Any uncertainty about the use or application of a product or system should be referred back to the manufacturer for detailed written advice. Manufacturers are best placed to offer advice about their particular products and any variation from their published data during the design or construction process could result in the component or system failing prematurely or not complying with the guarantee or warranty conditions. Additional project specific advice for demanding or complex constructions may also be obtained from one of the independent consultants featured on the MCRMA web site.