Home Detailed application Diamond Trim Application A250 - Trim Application

A250 - Trim Application

Application Instructions

The A250 is a drip trim, fitted to the lowest edge of the roof usually where the rainwater flows into the gutter. The batten for the A250 should be doubled up to provide a stand off for the gutter to fi t behind the trim, with the outer batten 10mm lower than the inner batten to allow for the radius of the trim. Apply Trim Adhesive to the batten in 30mm beads at 300mm centres, rub the trim into place and nail to the decking. Do not nail through the front of the trim. Where the trims are over-lapped, they should be bonded together with a thin strip of Trim Adhesive on the inside of the overlapping trim. If the pitch of the roof is only minimal, rainwater is likely to hold behind the trim. Use a planning machine to take 2mm off the deck to allow the trim to lay flush with the board. The A250 is supplied in 3 metre lengths.

Trim Details

The A250 is designed to cover insulation so is ideally suited to use with warm roofs and has an extra deep fascia to allow gutter penetration.


  a, mm b, mm c, mm
A250 95 140 10

A250 typical application




We use cookies to improve our website and your experience when using it. Cookies used for the essential operation of the site have already been set. To find out more about the cookies we use and how to delete them, see our privacy policy.

I accept cookies from this site.
EU Cookie Directive plugin by www.channeldigital.co.uk