A Step-by-Step Guide to Catnic® Urban Standing Seam Installation

Catnic® Urban is a lightweight, durable and easy to install solution. Catnic® Urban is manufactured from Tata Steel’s Colorcoat HPS200 Ultra® pre-finished steel, making it a cost-effective alternative to traditional copper and zinc standing seam roof systems. Seven times lighter than more traditional roofing materials (such as clay or slate tiles), Catnic® Urban is incredibly easy to handle on site and quick to fix compared to alternative roofing products. Here, Nick Roberts, technical Catnic explains the installation process for the innovative Catnic® Urban standing seam roof and cladding system.

Step one: Before Catnic® Urban can be installed, the complete roof expanse needs to be fitted with 18mm WBP Ply or OSB3 board and covered with the recommended breather membrane.

Step two: Next, cut the eave backing plates to suit the length of the roof and position them across the roof allowing a gap of 50mm minimum between the leading edge of the eave plate and the fascia – ensure that the eave drip will fall into the gutter once fitted. Fit this down at 200mm intervals.

Step three: Position the starter verge backing plate over the eave backing plate. It is important to align it squarely with the leading edge of the eave plate, with a gap of 25mm maintained between the outer face of the verge backing plate and fascia. Once again, fix this down at 200mm.

Step four: Fit the mono ridge backing plate on top of and squarely to the starter verge backing plate – again fix down at 200mm.

Step five: Now you can start to install the Catnic® Urban panels. It is important to ensure that you are installing the correct panel – the first panel can be easily identified, as it is one of only two featuring a 25mm upturned outer edge.

The notch should overhang the eave plate by 25mm and the upturned edge needs to be positioned level with the outside edge of the verge backing plate. Each panel features an integrated slotted nail fixing strip. Use this to secure the panel by installing the supplied nails at appropriate 180mm intervals along its length.

Step six: The second panel can be installed by positioning the female seam over the male seam. Using the rubber mallet work your way up the panel to clip the seam together. The panel should then be fixed down again at appropriate 180mm intervals through the fixing strip along its length.

This process can be repeated until you are ready to fit the end panel, which then gets clipped together along the seam as per the previous procedure. The 25mm upturned outside edge can now be aligned with the outside edge of the end verge backing plate.

Step seven: Form the 25mm overhang section at the front of each panel past a 90-degree angle around the eave plate, using the rubber mallet. The notch can then be fully formed using the eaves closer.

Step eight: Next, clip the colour matched verge trims over the top of the upturned outside edge of the starter or edge panel, as well as the lower edge hooked underneath the verge backing plate. This then gets formed back against the verge backing plate at the lower edge using the stubai pliers. Install two colour matched rivets at the eave and ridge end of the verge trim.

Step nine: Take your notch or Z bar and measure the distance between the starter panel upturn and the first seam and cut the end off the Z bar to suit. Apply two continuous beads of the supplied sealant along the Z bar length and fit this at 145mm offset from and parallel to the ridge backing plate. Ensure four fixings are equally spaced across each panel.

Step ten: Cut the mono ridge flashing to suit the correct length of the roof. Position its open welt onto the Z bar leading edge before pushing down to locate onto the bottom of the ridge backing plate. Using stubai pliers crimp along the bottom edge of the ridge flashing to secure it to the backing plate, and then install a colour matched rivet through the ridge flashing and Z bar at intervals of every other panel.

Step eleven: Finally, install the prefabricated colour matched end caps where the verge flashing meets the ridge and secure in position using two colour matched rivets.

 For more information on Catnic® Urban and the expert training offered, click here