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05/15/O1 TUE 05:42 FAX f�001 <br /> � ��o�o . . . <br /> . � � <br /> A�CM��cY��[ I <br /> ����� <br /> 6 1 : . 3 3 8 . 0 0 o i , <br /> fncrimil� �� 1 T • 9 3 A � 0 1 4 L <br /> MEMORANDUIVI <br /> Aate: 14 May 2(1(11 <br /> To: Lyle Oman <br /> �uilding O#ficial <br /> Post Of�ice;Box 66 <br /> Crystal Ba;�, MN 55323 <br /> From: Patrick �te;�an <br /> James llay�bn Design,Ltd. <br /> R�: Minneton�k� �:enter for the Arts. <br /> In your Fax on Ma.y 11 2001 regarding roof drains you brought up a few <br /> questions. They addressed the following: <br /> 1. Section1506.1 �of the UBC regarding roof slope. The building has varying roof <br /> slopes of 1/4" p�r foot over the office area, 3/16" per foot over the Sculpture and <br /> Ceramics area, a;�d 1/8" per foot over the north classrooms. Section 1506.1 of <br /> the UBC allows fc�r shallower pitched raofs than 1/4" per foot when they are <br /> designed for wat�ir ponding in accordance with Section 1611 of the UBC. Our <br /> project engineer i:� currently on vacation, but I will forward you that information <br /> when he returns �i.ext week. <br /> 2. Sizes of the rc��f scuppe�s. Included is a copy of the Minnesota Plumbing <br /> Code with the siz� of vertical leaders. Using the table in Section 4715.2710 <br /> subpart 5 Size of Vertical Leaders, we are able to calculate the areas for our <br /> leaders as follow:�: <br /> The roof o��er the offices is 4240 sqtt. and has one leader. This leader <br /> serves the whole��240sqft. Using the table we are able to calculate its size to be <br /> 4 inches. <br /> The roof od•er the Exhibition room is 2849 sqft. and has three leaders. <br /> Each leader serv�:s 950sqft (2849 = 3 = 950) of roof. The table calculates their <br /> sizes to be 2 1/2"'.inches. We will be using 4 inch leaders. <br /> S- �6 = o r o��;. <br /> �. ���i� �� <br />