2.4 Maximum lengths of roofing 6 2.5 Low roof pitches 7 2.6 Wind forces on roofs 7 2.7 Codes and performance tests 7 2.8 Environmental conditions 7 2.9 Metal and timber compatibility 7 2.10 Transportation 8 2.11 Paint and COLORBOND® finishes 8 2.12 Specifications - roofing 9 2.13 Specifications - walling 10
A typical 2-slope gable roof is often times cheaper to build but it allows the wind to catch the roof and it is much more easily blown away. Building a 4-slope hip style roof has been found to lessen the load of the wind on the house. The hip style roof can stand up to high winds when a storm comes.
May 22, 2014 · You know a gable roof from its distinctive triangle shape. These are very common on stand-alone garages. A gable roof is described by its pitch. If the slanted side of the roof rises 4 inches for every 1 foot it travels toward the center, then it is called a 4/12 pitch. Most garage roofs use shallow pitches of 3/12 or 4/12.
The most common materials used for roof decks are plywood or oriented strand board (OSB). When plywood is used, NRCA recommends the use of a minimum 15/32 thick or 1/2 inch nominal exterior-grade plywood for 16-inch rafter spacings and 5/8 inch nominal thickness for 24-inch rafter spacings.
The two most common types of panelized wood roof systems in North America are all-wood and hybrid systems. (See examples here.). An all-wood system consists of glued-laminated (glulam) beam girders with wood purlins (glulam, I-joists or open web wood trusses), wood sub-purlins and a wood structural panel deck.
Q. How much longer will a metal roof last than common roofing like asphalt or wood shingle? A. You can expect a metal roof to last at least 2 to 3 times longer than a regular roof. In general terms, count on a metal roof lasting 40 to 60 years and beyond. To put it in context, the average life span of an asphalt roof is 12 to 20 years.
Cut the necessary number of truss pieces with 22 1/2 degree angles on each end and a length of “H” along the long side. Temporary truss jig Build a temporary truss jig by screwing 2 long 2×4’s to adjacent edges of the floor at 90 degrees to each other.
Apr 03, 2020 · A mobile home roof over creates a unique opportunity to completely change the look of the home. Color, material and even the shape of the roof can be changed when a new roof is installed on an older mobile home.
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