test GRP Kit Calculator

GRP Kit Calculator

Calculate the right materials for your fibreglass roof — quick, simple, and tailored to your roof size.

1

GRM, Tools and Roof Size

Please enter the actual roof size (no waste). We'll round up to the nearest kit we offer.

Calculated Area
— m²
Suggested Kit
—
GRM / Tools
—
2

Select trims for each edge

Edge A
Length: 0 m
0 × 3m pieces required
Edge B
Length: 0 m
0 × 3m pieces required
Edge C
Length: 0 m
0 × 3m pieces required
Edge D
Length: 0 m
0 × 3m pieces required

Tip: A/C are the long sides (Length), B/D the short sides (Width).

3

Review & Add to Cart

Trim Breakdown
Item Qty
Enter roof dimensions and select trims above.
Cart Preview
  • —

Choose Your Trims

  • All trims are 3 metres long and made of 600grm fibreglass. Upstands are 35mm.
  • A170: Small drip for gutter run off. 65mm drop.
  • A200: Medium drip. 90mm drop. Matches B260. Compatible with C1/C4 corners.
  • A250: Large drip. 140mm drop. Matches B300. Compatible with C1/C4 corners.
  • B230: Small raised edge. Use to prevent run off. Matches A170. C1/C4 compatible.
  • B260: Medium raised edge. Matches A200. C1/C4 compatible.
  • B300: Large raised edge. Matches A250. C1/C4 compatible.
  • Wall edge: Bundles D260 wall flashing (120mm upstand) + C100 simulated lead flashing.