Shop our range at Selhurst Timber of roof felt designed to provide waterproof protection beneath roof coverings and across flat roof structures. Roofing felt is commonly used in pitched roofs, sheds, garages and flat roof applications to protect buildings from moisture and weather exposure. Installed as an underlay or waterproof layer, roof felt helps improve roof durability and performance while supporting long lasting roofing systems used by builders and roofing contractors. Are you spending over £150? You will receive free local delivery on qualifying orders across our delivery area.