Abstract: An intumescent gap seal comprises at least one flexible resilient sealing member (7,8) adapted to span a gap (4) defined between adjacent parts of a building (5,6) and an intumescent member (9) which, in an unexpanded state, is narrower than the gap (4). The or each sealing member (7,8) may comprise a curved elongate member to ease installation. Such a sealing member (7,8) will tend to keep its resilience better, so that its draught proofing qualities are maintained and will be easier to install.