Swish Building Products for Build Trade and Roofing professionals. Manufacturing UPVC Fascia, Gutter and Cladding systems for New House Builds. Supplying TruSeal Depots in Barnsley, Boston, Bradford, Chesterfield, Doncaster, Hinckley, Ilkeston, Langley Mill, Leeds, Lincoln, Loughborough, Manchester, Mansfield, Siddalls Sheffield, Siddalls Chesterfield, Stafford.