search for garage door brush and just roll it round. £49 from tech clean Something like this http://www.ebay.co.uk/itm/Garage-door-draught-excluder-brush-strip-kit-in-3-pieces-to-2670mm-trim-15mm-/321118125055?pt=UK_Home_Garden_Doors_LE&hash=item4ac421bbff#ht_822wt_970but I get mine from Killgerm a lot cheaper - 20mm bristles 2m long is £7.10 + vat but a couple of door strips from a DIY shed would be an easy option