Roof Rafters and Rafter Ties
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Tim Carter talks about rafters, rafter ties, and collar ties. Collar ties are in the upper 1/3 of the roof. Rafter ties almost always sit on the top plate of the walls. They form the base of the triangle that prevents the roof from sagging and collapsing. You can also install gusset plates near the ridge. These plates perform the same task not allowing the rafters to spread under the force of gravity.
Beware trusting the building code about the DEPTH or HEIGHT of a ridge board. The current code states that the ridge board should be the same or greater height than the plumb cut of the rafter. Have you ever asked yourself WHY this should be the case? Did you know there are hundreds of thousands of OLD HOUSES in the USA where the ridge board is a simple 1x6 and the rafters are 2x8s with much longer plumb cuts? These roofs have NEVER COLLAPESED. The rafters have not split at the bottom of the 1x6 ridge board. So why make the ridge as high as the plumb cut on a rafter?
STOP TRUSTING what you see in the building code and STOP BLINDLY accepting it as gospel. The code used to say, and it still might, that you do NOT have to put a water barrier on wood-framed houses if the gap behind brick or stone outer finish is greater than 3/4 inch. This is INSANITY!!! All brick and stone veneers leak VAST AMOUNTS of water during wind-driven rainstorms.
The code used to say that the sum of two stair risers and one tread must be between 24 and 26 inches. They changed that! READ THIS COLUMN:
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I could go on and on and on about HORRIBLE building practices mandated by the code.
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Discover more information on roof framing and ties at askthebuilder.com:
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