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� Ericksen Roed and Associates, II1C. �oeTir�e HANNAFORD RESIDENCE <br /> Structural Engineers <br /> 2550 University Avenue West,Ste 201-S JOB NO. 2015-816 SHEET N0. <br /> ' Saint Paul,Minnesota 55114-1904 CALCULATED BY PMB DATE 'I O/'I9/I 5 <br /> Telephone:651-251-7570 CHECKED BY PMB DATE 10/19/15 <br /> Snow Loads -from adiacent buildinq or roof: <br /> Hiaher Roof �ower Roof <br /> Roof slope = 0.0 deg 0.25/12 =1.2 deg <br /> Horiz.eave to ridge dist(W)= 71.0 ft 28.0 ft <br /> Roof length parallel to ridge(L)= 96.0 ft 42.0 ft <br /> Projection height(roof step) h = 3.2(t <br /> Building separation s = 0.0 ft <br /> Type of Roof Monoslope Monoslope <br /> Ground Snow Load Pg = 50.0 psf 50.0 psf <br /> Risk Category = II II <br /> Importance Factor I = 1.0 1.0 <br /> Thermal Factor Ct = 1.00 1.00 <br /> F�cposure Factor Ce = 1.0 1.0 <br /> Pf=0.7'Ce'Ct'I'Pg = 35.0 psf 35.0 psf <br /> Unobstructed Slippery <br /> Surface{per Section 7.4) = no no <br /> Sloped-roof Factor Cs = 1.00 1.00 <br /> Balanced Snow Load Ps = 35.0 psf 35.0 psf <br /> Rain on Snow Surcharge Angle 1.42 deg 0.56 deg <br /> Code Maximum Rain Surcharge 5.0 psf 5.0 psf <br /> Rain on Snow Surcharge = 0.0 psf 0.0 psf NOTE:Alternate spans of continuous beams and <br /> Ps plus rain surcharge = 35.0 psf 35.0 psf other areas shall be loaded with half the design <br /> Minimum Snow Load Pm = 20.0 psf 20.0 psf roof snow load so as to produce the greatest <br /> possible effect-see code. <br /> Uniform Roof Design Snow Load = 35.0 psf 35.0 psf <br /> Building Official Minimum = <br /> Leeward Snow Drifts-from adjacent higher roof <br /> Upper roof length lu = 71.0 ft <br /> Snow density g = 20.5 pcf Lu <br /> Balanced snow height hb = 1.71 ft <br /> hc = 1.46 ft � I Surcharga load <br /> hdhb>0.2= 0.9 Therefore,design for drift /Due to Drinirg --..-- <br /> Adjacent structure factor = 1.00 <br /> Drift height hd = 1.46 ft hC hd d , i�� . <br /> h p ' nI. '��'� ��`�p�; , <br /> Drift width w = 11.68 ft °��`;;;;���;.`'� 9alanced Snow Load <br /> Surcharge load: pd=y"hd= 29.9 psf h � � ' <br /> Balanced Snow load: = 35.0 psf <br /> 64.9 psf �+---�----►� <br /> Windward Snow Drifts-from low roof aqainst high roof <br /> Lower roof length lu = 600.0 ft <br /> Adjacent structure factor = 1.00 \T�l <br /> Drift height hd = 1.46 ft ti- <br /> Drift width w = 11.68 ft <br /> Surcharge load: pd=y"hd= 29.9 psf �;'//�•�P��`Roof . <br /> Balanced Snow load: = 35.0 psf <br /> 64.9 psf 15' <br /> Slidinq Snow-onto lower roof Sliding �"'1 „s� <br /> Sliding snow=0.4 Pf W= 0.0 plf Snow Load <br /> Distributed over 15 feet= 0.0 psf Balanced <br /> hd+hb= 1.71 ft Snow Load Lower Roof <br /> hd+hb<=h therefore sliding snow= 0.0 psf S <br /> Balanced snow load= 35.0 psf <br /> Uniform snow load within 15'of higher roof= 35.0 psf <br /> Sliding snow not required since upper roof slope is 1/4 in 12 or less <br />