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- Newsgroups: austin.talk
- Path: sparky!uunet!spool.mu.edu!sgiblab!swrinde!news.dell.com!natinst.com!cs.utexas.edu!chinacat!rpp386!jfh
- From: jfh@rpp386 (John F. Haugh II)
- Subject: Re: Self supporting roof (was Re: Cable Rates going up.
- Message-ID: <1993Jan1.185744.13876@rpp386>
- Reply-To: jfh@rpp386.cactus.org (John F. Haugh II)
- Organization: Los Tejanos SCUBA Club and Beer Joint, Austin, Tejas
- References: <Bzpx5n.1IKo@austin.ibm.com> <1992Dec25.171511.2585@rpp386> <1992Dec31.203845.20309@novell.com>
- Distribution: austin
- Date: Fri, 1 Jan 1993 18:57:44 GMT
- Lines: 50
-
- In article <1992Dec31.203845.20309@novell.com> bboerner@novell.com (Brendan B. Boerner) writes:
- >Framed to support itself, how so? Most every rafter I've seen looks
- >something like this:
-
- [ Framing deleted ... ]
-
- >Are you talking about something like this:
- >
- > /\
- > / \
- > / \
- > /---------\
- > / \
- >/ \
- >-----------------
-
- No, something more like
-
- /\
- || / \
- ||/ \
- |/ \
- / \
- ============ *
- | | ***
- | +-+ +--+ | ***
- | +-+ | | | *
- | *** | | | |
- ====================
-
- this ;-)
-
- But seriously, you can build a roof with almost no internal cross-bracing.
- The ceiling rafters (see my picture ;-) act as the cross-braces that are
- usually required (triangles being more stable than rectangles and so on).
- Usually the builder will erect a frame to hold up the ridge-pole and what
- have you until the roof rafters are attached to it. At that time you can
- (and probably will - because that much wood isn't free or cheap) remove
- all of the cribbing.
-
- Cheaper homes are built with pre-framed trusses so they can get away with
- using 2x4's. But you lose your attic in the bargain. Our rafters are 20'
- long or so 2x6's or 2x8's (I could go measure if you care) with only a
- few pieces of 2x4 at the apex. Flatter pitched roofs (again, ours is
- 6x12 or 8x12) require internal framing because of the mechanics of that
- low, wide "triangle" (being easier to "flatten" out), so you might see
- this on 2 story homes where total height is a concern.
- --
- John F. Haugh II [ PGP 2.1 ] !'s: ...!cs.utexas.edu!rpp386!jfh
- Ma Bell: (512) 251-2151 [ DoF #17 ] @'s: jfh@rpp386.cactus.org
-