This is the third part of a multi-part outline of what is involved in buildings a Habitat house. This article covers the steps in raising the roof and drying in the house and a myrid of little details going on at the same time. The first part is Habitat Tutorial – Prepration for Build which covers some of the pre-build steps the Site Project Manger (SPM) and selected volunteers go though just to get ready for the volunteers, and the second is Habitat Tutorial – Part 2 which covers the first day where the walls go up. In addition, there are three sets of pictures with slide shows that have already been published that you may be interested in as they concentrate on people on the job site – volunteers. The first is Habitat for Humanity – 2008 Dinner on the Slab consisting of 25 pictures including our future homeowner Nicole Combs and her son Elijah. The second includes 115 pictures of the first day of the build – Habitat Build 2008 – First Day – Walls Go UP . The third was released earlier yesterday: Habitat Build 2008 Second Day – Roof Goes On which has pictures and blog on the installation of the roof trusses and decking the roof. If you want access to any of the tutorial pictures they are all in one place for all the tutorials to date. Tutorial Slide Show - 146 pictures so far, including many not in this article.
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This is a a drawing I made of a generic roof truss, not too unlike what is actually installed. At least most of the parts are here. Below are pictures of the trusses we actually installed and you may note some minor differences. The major difference is the end trusses which have more vertical 2×4′s in the web so that there are places to nail OSB and siding. None of the ones we put up have a King Post.
The trusses are marked with alignment marks while still on the ground. Each truss is marked 14″ from one end (only), that end being the end that goes on the longest wall, (in our case the back wall). A line is snapped along the back wall exactly 2″ from the back edge of the cap plate. The corresponding 14 inch mark on the roof truss allows for a 12 inch overhang and the 2 inch offset in the snapped line. When the roof truss is slid into place a volunteer aligns the truss mark with the snapped line on the cap plate. If one end is right, then both ends will be right on these manufactured trusses.
I was one of the two marking the trusses. The other was Max, son of our SPM, Jeff Vanderlip. Each truss also receives a mark along the top plate/top rail at 47 1/4 inches and at 9 feet. These marks go on both ends of each truss. The 47 1/4 inch mark is the top edge of the beginning course of the OSB deck (which allows for a 3/4 inch overhang over the end of the truss. 3/4 inch fascia board stretched across the ends of the trusses will take up this overhang. The 9 foot mark is the location of the 1×4 boards used to tie the tops of the trusses together while the trusses are going up. 9 ft is chosen so that two courses of OSB panels can be installed below the 1×4 boards.
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