Laserfiche WebLink
1 • <br />� <br />ADVANCED <br />6. �AD8�.4 <br />Hudnrs are aacessary in load bearing valle to tran�fer the veight of roof <br />load� to �tud� around vindov aad door openings. In �tandard con�truction <br />practica haadara aay be a�ingle large blook of wood or sultipla tvo inch <br />thick seab�ri. For short epans this approach i� definitely overbuilt. .In <br />addition, it occupiei epace that could othervise be filled vith <br />insulation. 1Yio aethode parmit insulation vithout eacrif:.cing the <br />structural strength of the vall. <br />A. Let-in Headers <br />In single story buildings headere for ahorter epane can be sade of 2 <br />E naterial. Ia a 2% 6 etud wall, cut a 1 1/2 inch notch out of the <br />atud. Thie allova tLe header to be "let-ia" to the notch. 'Y'he <br />header is placed flush with the exterior or interior �urface of the <br />rall. Tttn let-in technique elisinates the need for "cripple�" [o <br />support the header. The figurea on the preceding page illuserate <br />thi� technique. <br />As the epan betveen ehe bearing etude ie increased, the atreagth of <br />the header mus[ also increase. For example, a 2 a 8 may be u�ed for <br />a�pan of four feet, but a 2 z 10 would be reauir�d for a apan of siz <br />feet. <br />B. Double Headers <br />Span calculations say indicate tLat a eingle two inch thick meaber <br />vill be in�ufficient to carry the required loads. In this case, tvo, <br />two inch thick aembers could be used. Mvunt the fi�ret sember flush <br />with the e:terior surface of the etuds. Inaulation is installed and <br />the second meaber ie mounted flueh with the inside surface of the <br />, stude. Cripples will De required vith ehie type of header. <br />� <br />the tvves/of headets deecribed ab6ne orovide eome <br />amount of dvace is LYmited. To <br />��„�,��, 4-158 <br />