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GRP / Fibreglass Roofing Trim FAQ's

Roofing Trims

The answer is yes, with a bit of work! Depending on the trim, in most cases you will need to sand the strip of existing fibreglass where the new trim will be placed right back to the board. The new trim can then be fitted. Once the trim is secure a layer of fibreglass will need to applied over the new trim. This will ensure the roof remains water tight.

Whilst we would recommend GRP Trims with a fibreglass roof (the fibreglass will bond better). If you decide to use lead or metal trims, ensure the lead or metal is clean and free from contaminants. Use G4 sealer when overlapping with the fibreglass.

  • Sand an area of about 50mm around the crack using rough grit sandpaper to create a key. Clean down with acetone.
  • Cut a piece of 450g chopped strand mat the same size as the area sanded. Cut a second piece of 450g chopped strand mat slightly smaller.
  • Mix resin and catalyst. Brush on the resin to the area and apply the larger piece of glass. Applied more resin until the glass is fully wetted out. Apply the second layer of glass and wet out with resin using a brush.... Read more

It is recommended that 15mm galvanised clout nail is used or s/s staples that will sit flush with the roof.

Roof trims should be measured and cut to size with a 'snips' (to reduce dust). A dab of roofing adhesive should be applied to the batons to prevent rattling in the wind. Roof trims should then be either stapled with s/s staples of nailed using 15mm clout nails into place every 120-150mm. Where two trims have to be joined together, ensure an overlap of 50mm and apply roofing adhesive to seal.

A drip trim is placed at the lowest edge of the roof and is used to allow the water to runoff into a gutter. A raised edge trim is used to prevent the water runoff.

The following trims are compatible with each other
  • A200 is a fascia trim for allowing drainage into a gutter. Compatible with C1 C2 and C4 corner trims
  • B260 is a raised edge trim which prevents water runoff. Compatible with C1 C2 and C4 corner trims
  • A200 and the B260 are compatible with each other
  • A250 and B300 - A250 is a fascia trim for allowing drainage into a gutter & the B300 is a raised edge trim which prevents water... Read more