Handrail grip size is either Type I or Type II.Handrails on top of guards: Only have dimensional requirements when they are applied as open sides of stairways and are used as the required handrail.Handrails for residential differ from handrails for commercial projects. The second is that the triangle of the tread riser and the bottom rail cannot pass a 6” sphere. This allows for a two baluster per tread method of construction. Please note that there is two exceptions to this 4” rule and that is for the guard on the open sides of the stairs where the space cannot pass a 4 3/8” sphere at the balusters. Guards shall be constructed such that a 4” sphere cannot pass. It is required to be constructed such that it can withstand a 200 pound force at any point on the rail (R301.5 – note d), Railing (defined in the codes as a “Guard”) is required to be a minimum height of 36”. This also applies to the open sides of stairs that are over 30” above adjacent floor or grade. Guards (Railing) are REQUIRED at all porches balconies, ramps and raised floor areas that are 30” above the floor or grade below). For NEW (and as may apply to remodeling) Construction of Residential the following are the specifics. Current Codes for residential and commercial differ. Railing heights and Baluster spacing is one of the more common code questions and often one of the items that typically fails the inspection.
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