Be careful what you ask for. It may be time to re-assess the layout of your drapes from a masking perspective. Simply replacing the current drapes with the same dimension products won't improve your back-stage / off-stage / over-stage masking. This may require the relocation of battens or re-trimming the height. If you don't do it now, it may be another 20 years before the opportunity arises.
Also to be considered is the rigging and tracks from which the drapes hang. Many venues have old outdated rigging that is not executed with load-rated components. Drapes may be soft, but the battens and tracks that hold them up aren't. They can do significant damage to people should they fall down.
When your drapes are down for cleaning / repair / replacement is the best time to thoroughly clean your stage - everything from the ceiling to the floor. Eliminating latent dust and crud can keep your new rags clean much longer.
When you have the stage house clean: re-finish / replace / re-paint the floor is the next logical thing to do while the stage is clean and clear.
This is also a good time to institute a new policy of NO SAWING OR SANDING onstage. Keep the crud out of the theatre and off of stage. Almost anyplace is better than on the stage for these activities.
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Erich Friend
Theatre Consultant
Teqniqal Systems