Gutter Repair

Substrate DegradationProblem: Substrate Degradation

A roof gutter at eaves or central valley location forms the main component of a system which collects and diverts rainwater shed by the roof to protect a building’s foundation by channelling water away from its base. They also help to reduce erosion and protect painted surfaces by reducing exposure to water.

Rain gutters can be constructed from a variety of materials, including cast iron, lead, galvanised steel, copper, aluminium, PVC (and other plastics), concrete, asbestos cement and single-ply.

Reasons for failure are often as follows:

  • Clogged gutters can cause water leakage into the building as the water backs up. Clogged gutters can also lead to stagnant water build up allowing grasses and weeds to grow in the gutter.
  • Inadequate falls leads to poor drainage and standing water which promotes substrate failure.
  • Slow drainage causes accelerated oxidising (corrosion) at the waterline.

Fortunately, it’s usually the lining and not the gutter itself that needs replacing. Caught in time, most guttering can be treated and its protection indefinitely preserved.

Delcote Gutter Repair

Treatment: Delcote® HPG

Delcote® HPG is a single component, silicone coating for gutter repair relining. Used in conjunction with Seamsil® 300, (defective joints), the coating system offers a seamless weatherproofing solution.

  • It is UV resistant and accommodates gutter movement.
  • It repels water and will not sacrificially erode.
  • It forms an oxygen-free bond to steel – providing a primerless, anti corrosion membrane.


DELCOTE® HPG is an elastomeric membrane, with vapour breathable properties suitable for application as a protective weatherproofing coating to completely coat the gutter surface. It has excellent elastic and flexible properties to withstand normal surface movements and is unaffected by UV or extremes of weather and temperature.

Read more about Delcote ® HPG

Defective Gutter Joints

Problem: Defective Gutter Joints

Some of the main problems encountered on leaking gutters originate from the joints themselves. Poorly installed seals or twisted and misaligned gutter sections often make it impossible to effect a watertight seal. Corroded bolts cannot be re-tightened.

The Seamsil® 300 Specification is designed for this purpose, particularly in situations where the existing defective joint cannot be broken and reassembled.

Seamsil Treated SurfaceTreatment: Seamsil® 300

The Seamsil® 300 system has been developed against a background of decades of experience of roof repair and is designed to be user friendly in application, comprising a gun applied sealant followed by a coating of brush applied Basecoat.

Seamsil is used to provide an externally applied fully bonded flexible joint, capable of withstanding all normal gutter movements without cracking and at the same time ensuring that the joint remains totally watertight.


Seamsil® is unaffected by weathering conditions such as sunlight, ultra violet radiation, rain, snow and temperature extremes. The excellent weather-ability and high temperature movement accommodation enables the system to perform after many years of exposure.

Read More About Seamsil® 300