As for the truss itself, there's no question they'll outperform anything
stick-built onsite w/ less material and lower cost unless there is far
more material and time invested.
I'm certain Code there will have near-equivalent reqm'ts as does that of NA.
If they're under-spec'ed (and a builder can get away w/ it for lack of
proper Code enforcement or are poorly installed, that's entirely
It's not that the builders are lazy or incompetent, it's just good
business sense. It's more efficient to have them built in a factory
in controlled environment, Most of the time, attic space aren't
engineered for loft use anyway, even though many people think they can
put some plywood down and built some knee walls and move in. Then
they complain about the below ceiling sagging.
Agree. The "local workmanship" around here framed our house thinking that
somehow we wanted garage doors that were only 3 feet high. After the
builder fixed that -- wasting time and a lot of wood, I was glad to see the
prefabricated trusses and other structural parts arrive.
I'll throw in another reason to use prefab trusses as well. As I visited
several "independent living" retirement communities with a relative
contemplating moving into one with detached homes, we were surprised to find
the management very willing, at no extra charge, to tear out walls and
partitions to suit whatever living style was wanted. The single-story homes
had no attics and with truss construction could be remodeled easily into
different floor plans including one large kitchen-dining-living room. Some
units were being changed every 5 years or so.
That is true but still it depends on experienced trades people.
There are many poorly slapped together houses flooding the market.
Always buyer beware like every thing else. I always had my houses custom
built per my specs. 7 times in my life time including one 4 season
cabin in the woods.
On Thursday 03 January 2013 17:14 Steve B wrote in alt.home.repair:
I guess a lot comes down to the roof angle too.
If you have a 40 degree pitch as I do on a 8x12m building, then it is
begging for a loft conversion. Though, these days, you might as well build
that in from the get-go - as someone said, if you can get engineered trusses
with big cuboid spaces built in, then why not...
If you have a 20 degree (or less) roof, no-one is likely to do very much in
the roof space...
Tim Watts Personal Blog: http://www.dionic.net/tim /
"History will be kind to me for I intend to write it."
You point out the only real drawback of trussed roofs; floor loading.
They're designed for roof loading, not for heavy objects placed in the
attic. At higher pitches I don't thing they make as much economic
sense, either, since the materials costs go up. I don't see a lot of
trusses above 6:12, or so. For some reason every newer house around
here, and where I used to live has high pitched roofs (my last house
was 15:12). I was told it was code but that explanation doesn't make
much sense in areas where there is no snow and hurricane remnants
aren't all that unusual.
I have seen trusses for high pitched roofs. Their big problem is
transportation because they are so tall. The ones I have seen used were made
in two parts to keep them under the maximum height for vehicles. The first
part spans the building, and the second part fits on top to create the peak.
Oh, I've seen them, but they're rare. Yes, I've seen manufactured
houses that basically do the same thing; hinge the peak over to make
the maximum height (or hinge both roof sides and lift the center into
On 1/2/2013 8:34 PM, email@example.com wrote:
In all the replies this was not mentioned. With trusses, heating ducts,
etc. can be run perpendicular to the truss itself ... not so with solid
joists. This makes the room below without bulkheads to house that
stuff. In my house it uses trusses over the basement. The basement
ceiling is totally flat. So if someone wanted to finish a basement
room, it would work out well.
On Thursday 03 January 2013 14:30 dpb wrote in alt.home.repair:
Fairy'nuff - we'd usually call those "engineered" but it was what I was
thinking of. I have no objection to those and it does avoid plumber hacking
bloody great notches in them.
Tim Watts Personal Blog: http://www.dionic.net/tim /
"She got her looks from her father. He's a plastic surgeon."
Well, of course they're engineered but a truss is still a truss whether
it's flat or peaked or whatever-shaped to fit the need...it's the
principle of using the diagonal member to take the load and provide the
stiffness in lieu of solid material that's the key here, not the shape
or the purpose.
But it only makes sense to use them in the spring. I quote from the
"Why have they become so popular lately?
There are numerous answers to this question, how ever, the most
important are the may cost saving benefits."
If they only save money in May, that really puts them at a
disadvantage to other building methods.
On 1/3/2013 12:18 PM, firstname.lastname@example.org wrote:
Web joists aren't trusses which is why they're called "web" joists--not
The point is/was that "truss" by itself doesn't necessarily imply only a
roof truss as was stated in the post to which I responded.
As the OP, my question was about Trusses, not floor joists, or Web
joists. I'd consider trusses, but no way would I use those joists that
are particle board with a 2x3 on the top and bottom. I'm not sure what
they are called, but I'll avoid them. Particle board is just not real
sturdy, and if the toilet overflows, what happens to those things when
they get wet.
Web joists are another matter. I have seen them used in commercial
buildings. They look sturdy, but in a house, they would consume a lot
of space, so a standard 8 foot wall, would end up being 10 feet.
However, this is not part of my original question about roof trusses.
On 1/3/2013 10:13 PM, email@example.com wrote:
The joists that are "are particle board with a 2x3 on the top and
bottom" _are_ web joists. Perhaps you're leaving out the "open" in
"open web" but that makes them structurally a truss as outlined in
another posting that outlines the difference between the two design
forms of a lightweight structure to support a load over a span. As
noted therein, the truss accomplishes it by causing a set of members to
act in (nearly) pure tension/compression w/o any significant bending
forces whereas the other uses a (constrained) solid web to provide the
resistance against bending stresses.
That the risk from failure of a structure owing to a plumbing leak
causing a failure of a web joist is pretty well demonstrated by there
not being in wave of such occurrences.
As for the height, there's always a tradeoff--there is no free lunch.
As compensation for the higher wall height as another noted there's the
payback of an unobstructed ceiling w/o dropdown duct chases and the like
for finished basements/lower floors as a payback. Whether that is or
isn't sufficient benefit in your mind it certainly is in many. I'll
comment that I like it very much in the house in TN altho it was a
purchased on-spec house and hadn't thought about it to any extent (as in
at all) before and it wasn't a real factor in the decision to purchase.
But, it was _very_ handy when finishing the remainder of the basement
for pulling additional wiring/plumbing runs, etc., and the plain
ceilings were also a plus.
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