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� t , .Framing a cathedral ceiling- Fine Homebuilding Question&Answer Page 2 of 3 <br /> Through <br /> boits <br /> ���" <br /> � <br /> 4•�*�^' <br /> * <br /> Doubled collar <br /> ties at every <br /> third rafteir <br /> You can get away with removing lwo out of every three collar ties because the eaveswall plate acts as a horizontal beam.It transfers the oulward thrust of the lwo intervening 16ir <br /> o.c.rafters out to where the opposing plates are tied together by the remaining collar ties.Incidentally,the 4&in.o.c.rule for collar-tie spacing prevailed in the days of 2x4 walls. <br /> Because most exterior walls are now framed with double 2x6 top plates,you might be able to increase that spacing,depending on the weight of the roof.Obviously,your final desig <br /> should be reviewed by an architect or an engineer. <br /> The final option for openinp up the ceiling space would be to hang all the refters on a strudural ridge beam supported at each end by a wall,as shown in the drawi�g below left.Thi: <br /> beam must be capable of cartying half the weight of the entire roof.The other half is carried by the eaves walls.The nice thing about this approach is its simplicity.The not-so-nice <br /> thing is getting such a large beam up there in the first place.In your case,a 26ft.long beam is going to be mighty hefty.If you've got a crane handy,you could use a one-piece <br /> beam such as a steel I-beam or a wood glulam.If you're relying on muscle power,you'll probably want to set up pipe scaflolding so that you can sandwich the beam together in <br /> place from smaller members.These might inGude 2x lumber,1-3/4 in.thick Micro-Lams or steel flitch plates. <br /> Strueturel iiUge beem <br /> supparts.Y�the roof foad. <br /> � <br /> � <br /> � i� Posf suppOrts <br /> ridge 6eam <br /> TopP�B+e � anrttransfers <br /> supports%o/ foad to <br /> � the roolbad �oundatTon. <br /> From Fine Homebuildirg77,pp.20 Odober t,1992 <br /> WE RECQMMEND <br /> �Y <br /> �p�� �.:w.+��*..r�....� !'� ��.� . � I .�%�-.i—..w r,,, "V . <br /> .�u.., <br /> w � ✓' "'� w..� . �..�.��w.... .� . �. .�'�ry�� <br /> � w. ;;l j/' <br /> �� ���,^,...:::r � � �"...�"�'...�. „� .: -4 <br /> <� ,,�.,�,+..-» � �� _ �.��. ..; ,� <br /> ti.c. ;, � <br /> ��, �..: � ��� � � �" � �` <br /> nc� �*I 12 in; �g <br /> � , ..s <br /> , , ; q w» <br /> .._... .��' .,... <br /> - <br /> _ ----.. .M_. . °' . <br /> 8 One•Room Wonders Waterproofing a basemenl hom the insitle Cortrfortable Cathedrel Ca�Angs Gypboard concrete forms <br /> D.vel1 <br /> .`� � � i:?,� � � 91 <br /> a � ...°� uL,; �ib� ,�._�.ar-zy � II <br /> �� � �� � <br /> ��.p � �, F.. ._ � , <br /> 1s�;''�". �� .��,.,.n-']�� � <br /> 'R'E ......,...2.� ��, <br /> \ i g "� <br /> S� <br /> n <br /> __w <br /> � � <br /> ' '��'�`'S�t '�.``"- ? <br /> ��, � ��.�� ,_. <br /> .. �w� .::�, � f. � ..�� ���.. �°� :�;� � t .. <br /> •� ' t L'i`^�i�etro ,�,- <br /> ��rr:; W. �.,e <br /> w�b�.�k.��' E. ' 6. <br /> ... . , � xv . . <br /> �...... . _�,�-.• 1 � .� . . �:...:. .. <br /> http://www.finehomebuilding.com/how-to/qa/framing-cathedral-ceiling.aspx 7/9/2014 <br />