What does 'Bowing Roof' mean?

Introduction

"... surveyors should never estimate the cost of works; When rising damp, penetrating damp, subsidence, cracking, sagging roofs, bulging walls and all the other frightening things in a surveyor's report might be serious, and when they are not; Why asking the vendor to carry out work is not..."

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Chapter 20: What a Property Survey Really Means

"... difference between rising damp and penetrating damp; How to check more than a structural survey covers and pay less; Why a sagging roof may not be a real issue; How to handle subsidence, movement and bulging walls; When to use a survey to renegotiate and when to keep quiet; How to..."

"...Unfortunately few people stopped to consider that these were much heavier than the original slate and so would need better support from the inside. As such many roofs began to bow inwards, not to the extent that they leaked or collapsed , but bowed nevertheless. Extra timber supports will need to be inserted or the concrete tiles replaced with lighter ones if the sagging roof is getting worse. If the roof has sagged, and then stopped, there may be no reason to take any action. ..."

"... the roof has sagged, and then stopped, there may be no reason to take any action. Most of the time bowing or sagging roofs are visual to the naked eye and concrete tiling is obvious because of its thickness. True Story - A Victorian Roof on a Victorian PropertySimon and Nichole were buying..."