Shop our range at Selhurst Timber of roof flashing designed to seal roof joints and protect vulnerable areas of roofing structures from water penetration. Flashing is commonly installed around chimneys, roof valleys, walls and roof junctions to create a watertight barrier that prevents leaks and protects the building structure. Used by roofing contractors and builders during roof installation and repair work, roof flashing is an essential component for maintaining durable and weather resistant roofing systems. Are you spending over £150? You will receive free local delivery on qualifying orders across our delivery area.