Ceiling framing is the construction of ceiling and ceiling construction begins when all walls have been aligned, plumbed and secured.Â One of the main functions of ceiling frame is splicing of outside walls of the building. Rafters are used to resist outward pressure placed on the walls. Joists are the most important element in framing of ceiling. One must know while selecting the products the span of joist i.e. clear distances between the supports. There are certain specifications which are considered while selecting rafters, and joists such as moment, reaction and shear capacity for normal load duration, deflection in terms ofÂ Â shear and bending deformation and live and dead weight.
Repair of rafters and joists is very expensive and time consuming process but with growing technology this has been possible with low cost as well because of timber resin splice called TRS. Timber resin splice is new technique which allows Low disturbance and cheaper repairs repair ofÂ beams, tie beams, lintels, joists and rafters. This method can even be used for repairing flag poles.
ThereÂ areÂ certainÂ approvedÂ methodsÂ andÂ formulasÂ forÂ calculatingÂ depthÂ ofÂ joistÂ forÂ reducingÂ itÂ orÂ increasingÂ it.Â UsuallyÂ aÂ thumbÂ ruleÂ isÂ followedÂ forÂ calculatingÂ depthÂ ofÂ joistÂ .ItÂ isÂ halfÂ theÂ distanceÂ betweenÂ supportsÂ plusÂ 2Â inches.Â E.g.Â Â Â TheÂ joistÂ depthÂ requiredÂ forÂ aÂ 14-footÂ spanÂ isÂ 9Â inches.Â BandÂ sillÂ isÂ anotherÂ termÂ forÂ joistÂ usedÂ byÂ constructionÂ workers
There are differentÂ ways to do repairs ofÂ joists and rafters through this method .One isÂ without removing sections of ceiling, repair of dry rot can also be done, repairing of splits and shakes, roof truss is also possible through this method.