General release of liability form is the legal document that is signed between the two parties when the releaser declares not to sue the releasee for the said details.  Like other legal forms, this legal form is mandatory in some cases.

1) Gypsum ceilings as already described and these types are popular and varied. 
2) Plywood and Multiplek ceilings that are made of recycled wood or non-native wood waste as natural wood and consist of more than one layer. Economical but less termite resistant so it requires wood meni. 
3) Ceiling that contains asbestos but has now been abandoned. 
4) PVC ceilings have Polyvinyl Chloride stands. This material is made from synthetic elements.