A Better Cut Edge Corrosion Treatment
Cut edge corrosion is the most common defect we see on metal roofs in our building surveying practice.
The only product on the market 10 years ago, was over complicated and very expensive.
We decided therefore, to design something that was simpler, more effective and easier to apply.
The system is called Flexlap. It comprises a marine grade epoxy primer that is overcoated with our unique, self-levelling, semi-gloss silicone coating.
Unlike other manufacturers, we do not believe that joints in roof sheets at the mid-lap areas should be sealed with sealant.
We also believe that if the bottom most sheet at the mid-lap areas should not be touched in most cases, since these areas are not usually affected by corrosion.
This leads to huge material cost savings as well as significantly lower installation costs.
Sometimes, sealing overlapping roof sheets might be necessary
There are occasions when it might be necessary to treat top and bottom sheets at the mid-laps, but in these cases, we do not recommend sealants, as they split easily, trap moisture and cause a latent defect.
Instead, we utilise our own HP Butyl Tape, which is a geo-textile faced, 20 year waterproofing tape that is far stronger than sealants used by others.
If you really prefer using a sealant
We won’t stop you. We have a product called Lapsil that’s made just for this purpose, but we don’t recommend its use because of the reasons already stated.
How To Seal Overlapping Roof Sheets
Cleaning The Flexlap System
Flexlap is a soft silicone coating that in common with other cut edge corrosion treatments, is susceptible to environmental dirt pickup.
The unique composition of Flexlap makes it easier to clean.
All that is required is a weak solution of washing up liquid and water. Simply wash the surface with a sponge or mop, rinsing regularly to avoid smearing dirt over adjacent surfaces.
Sometimes, underside corrosion will be present at mid-laps and this can result in unsightly rust staining being noticable below the treated areas. This is not a defect and will usually wash off with soap and water.
We do not recommend that jet washers are used to clean Flexlap installations.
All installations should be examined annually for signs of surface damage and, if noted, the affected area should be cleaned, dried thoroughly and touched up with Flexlap.
Whilst Flexlap does not support fungal growth, it is possible for algae and soil to settle on the surface. Whilst washing will usually remove this, Liquasil can provide an anti-fungicidal wash to help delay any recurrance.
Please note that Flexlap can only be touched with Liquasil products. Other products are not likely to adhere.