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tear off low slope roof and replace with pre fab trusses

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tear off low slope roof and replace with pre fab trusses SaubleBeachrental 03-19-2007
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Posted by on March 19, 2007, 4:29 pm
I have 46' x 34' two storey cottage that has a ridiculous roof pitch
(less than 1 in 12) sloping from the front to the back of the 34'
span. As such the weight of many snowfalls has bowed the roof (where
no supporting walls are) causing water damage along one back wall. I
would like to consider tearing off old roof and replace with a proper
pitched gable roof with scissor trusses to have a vaulted ceiling.
Obviously weather timing is critical, but I have seen new construction
truss roofs partly built in sections (say thirds) and then placed on
the roof by a crane. This would allow for quick coverage relatively
of the open floor below. Has anyone done something like this?

J


Posted by marson on March 19, 2007, 6:56 pm
On Mar 19, 3:29 pm, SaubleBeachren...@gmail.com wrote:
> I have 46' x 34' two storey cottage that has a ridiculous roof pitch
> (less than 1 in 12) sloping from the front to the back of the 34'
> span. As such the weight of many snowfalls has bowed the roof (where
> no supporting walls are) causing water damage along one back wall. I
> would like to consider tearing off old roof and replace with a proper
> pitched gable roof with scissor trusses to have a vaulted ceiling.
> Obviously weather timing is critical, but I have seen new construction
> truss roofs partly built in sections (say thirds) and then placed on
> the roof by a crane. This would allow for quick coverage relatively
> of the open floor below. Has anyone done something like this?
>
> J

Well, no I haven't done this. But there are some things to consider.
First, it is going to take a honkin big crane to lift a 34 foot wide
truss set, especially on a house that size (the crane's capacity goes
down as the distance from the turret increases. This will be no truck
mounted crane like you see lifting trusses at jobsites. Think Grove
or something similar. Do you have a lot of room? You will have to
have room to frame the roof, park the crane within it's lifting radius
and swing the thing up there. What kind of surface do you have to
work on this roof--you will need a flat place to build the roof. a
slab would be ideal. Also, there is the whole problem of dimensions.
Is your house square and are the bearing walls parallel? Pretty hard
to figure out until you tear the old roof off.

I'm not saying it can't be done, but the logistic challenges are
daunting. I once tore a second story off of a house--spent 500 bucks
on a 30X40 rubberized tarp. Yeah it sucked to haul that thing out at
the end of every day, but it worked.

good luck


Posted by longshot on March 20, 2007, 6:48 am
>> J
>
> Well, no I haven't done this. But there are some things to consider.
> First, it is going to take a honkin big crane to lift a 34 foot wide
> truss set, especially on a house that size (the crane's capacity goes
> down as the distance from the turret increases. This will be no truck
> mounted crane like you see lifting trusses at jobsites. Think Grove
> or something similar. Do you have a lot of room? You will have to
> have room to frame the roof, park the crane within it's lifting radius
> and swing the thing up there. What kind of surface do you have to
> work on this roof--you will need a flat place to build the roof. a
> slab would be ideal. Also, there is the whole problem of dimensions.
> Is your house square and are the bearing walls parallel? Pretty hard
> to figure out until you tear the old roof off.


you could also consider rafters instead of trusses, if the crane would be
too expensive



Posted by marson on March 20, 2007, 7:31 am

> you could also consider rafters instead of trusses, if the crane would be
> too expensive

using rafters would increase the time he has his house open to the
elements


Posted by Noncompliant on March 20, 2007, 7:12 am
>I have 46' x 34' two storey cottage that has a ridiculous roof pitch
> (less than 1 in 12) sloping from the front to the back of the 34'
> span. As such the weight of many snowfalls has bowed the roof (where
> no supporting walls are) causing water damage along one back wall. I
> would like to consider tearing off old roof and replace with a proper
> pitched gable roof with scissor trusses to have a vaulted ceiling.
> Obviously weather timing is critical, but I have seen new construction
> truss roofs partly built in sections (say thirds) and then placed on
> the roof by a crane. This would allow for quick coverage relatively
> of the open floor below. Has anyone done something like this?
>
> J
>

What your probably saw was a hip roof using trusses. The middle section is
one continuous truss with one or more sisters nailed to it to create in
essence, a beam. This was probably on the end of a continuous run of
trusses. After the beam sections on each termination, trusses are run 90
degrees from the other run of trusses. They look like 1/2 trusses.
Continued smaller 1/2 trusses continue down the hip.

Have also seen 1/2 trusses joined at wall section on a simple roof.

Go to a truss company and talk to the engineer with specs on your cottage.
He can tell you what's possible.
--
Noncompliant

Money don't wag the dog's tail.



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