Installed onto Wooden Strapping Rather Than Directly to the Roof Deck
London Eco Roof panels are mechanically fastened on to a horizontal spruce strapping system (rather than directly to your roof deck itself), meaning the fasteners do not create hundreds of perforations in the vapour barrier itself. The vapour barrier installed beneath your new metal roofing is designed to prevent moisture condensation from infiltrating your roof deck and prevent rotting.
(Note: condensation naturally forms beneath all metal roofs whenever humidity and temperature changes.)
Weight Bearing Load of New Roof Supported by Rafters- not the Existing Sheathing Deck
Smaller metal shingles are applied directly to the roof deck using concealed fasteners. Not only does this create thousands of perforations in the newly applied vapor barrier system, its also means that the weight bearing load of snow in winter is supported by the sheathing deck.
If your roof has had one or more previous shingle replacements, the sheathing deck (due to ageing) may be starting to sag between rafters.
This negatively effects both the aesthetics and life expectancy of your roof in the long term.
A London Eco Roof is strapped to your roofs existing rafters, meaning it can also be easily shimmed to ensure it is 100% level. There is nothing worse than a sagging new metal roof, a commonly seen flaw with metal shingles
Less Torque Exerted by Metal Expansion and Contraction with Our Metal Roofs
Metal roofing expands and contracts with temperature change. Traditional ribbed metal roofing can expand by 1/2 - 3/4 inch on an 18 foot run. Over time the forces of expansion and contraction can work fasteners loose.
To prevent this, London Eco Roof Architectural Panels (Bingo ,Bravo & EcoTile) are engineered with a unique tension release feature built in to the relief edges of every architectural panel. This feature eliminates traditional stress loads exerted on exposed mechanical fasteners when your metal panels expand and contract.
Why OUR Exposed Fastener system WILL not LEAK
The main reason that exposed fasteners on many roll form metal roof systems fail is because of daily expansion and contraction of the steel panels that works the fasteners loose and increases the diameter of the screw holes, eventually leading to leaks. On a standard 18 foot roll formed metal panel this expansion is typically around ½” daily.
Because the London Eco panels are profiled with a scalloped European design providing both lateral and lineal expansion, the torque is confined to 18” panel sections which accommodate this expansion and contraction without working loose the fasteners or increasing the diameter of the screw holes
Our neoprene washers are capped by a metal cup with eliminates UV exposure and because the roof system is double strapped, the surface temperature of the panels remains significantly lower which helps extend paint life and also reduces weathering of the concealed neoprene washers
Our ‘permaseal’ exposed fastener system uses a corrosion resistant 1.5” fastener designed to match the longevity of your roof panels. Each fastener includes a completely encapsulated neoprene washer sealed within a cupped metal washer that is torqued to 30 lbs. PSI to protect the neoprene against UV exposure and degradation. Our corrosion resistant screws are coated with the same paint as your metal roof to ensure no color variation between your roof and screws.
Exposed fasteners allow the roof panels to be individually removed or replaced should access to the roof ever be required – or in the event that individual panels are damaged by falling debris like trees.
All that said, if your roof ever leaks, remember it is covered by London Eco’s 50 year, non pro-rated warranty covering both material and workmanship