Can a buyer re-negotiate the length of an inspection contingency?

[Kay March]

In Florida a buyer and seller have agreed to a relatively short inspection contingency period, five days. During the five days a problem with the roof arises which cannot be resolved within the five day period due to the lack of cooperation of the roofing company who installed the problem roof and due to the difficulty of getting roofing estimates from alternative roofers. Can the length of the inspection contingency be renegotiated?