![]() On nails in shear 10 diameters penetration into the main member develops full shear values. HR = Height of roof ridge measured vertically above the top of the rafter support walls.So raising the rafter tie to 1/3 puts more pressure on the connection and you need to put 50% more nails? ![]() HC/HR Heel Joint Connection Adjustment Factor When ceiling joists or rafterties are located higher in the attic, heel joint connection requirements shall be increased by the following factors: Tabulated heel joint connection requirements assume that ceiling joists or rafterties are located at the bottom of the attic space. Is this because the weight of the ceiling is bearing more on rafters? Now if I take that 124 inch "rafter spans" and "shall be multiplied by the factors given below", which is. 2 12" O/C can span 124 inches according to the chart. So, If I moved the rafter tie from the bottom of the rafter to 1/3 up from the bottom of the rafter I decrease the rafters span?Įxample: TABLE R802.5.1(1) 2x4 spf no. HR = Height of roof ridge measured vertically above the top of the rafter support walls. HC = Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below: The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. With the cold weather, I've been spending a lot of time reading the charts and practicing design ideas.Īll rafterspan tables have a Footnote a to them:
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