Metal Roof Insulation

[Tutawl]

I have a double wide trailer that I recently had a freestanding pole barn-
type metal roof put over. The trusses are approximately 1.5 ft. above
original metal roof on trailers and sides come down to just past the
original roof edges. From sides of new roof to trailer is about 16 in. which
I am in the process of installing vented soffit. I plan to put vents in the
gable ends and on the roof surface if needed. The question is when I had the
metal roof installed it was not insulated. When I enclose the roof am I going
to have problems with condensation on the bottom side of new roof with it
enclosed like this or are the roof vents and soffit going to give it enough
ventilation ? Or am I going to have to insulate the bottom of the new roof to
stop condensation? P.S. I live in central Illinois if that has any bearing on
your answer.

[jloomis]

I know some folks have insulation sprayed on the interior underside of the
metal roof...
I am not sure if this is applicable to your situation.
It is a foam type application. Used for insulating and fireproofing.....
jloomis
"Tutawl" <u43547@uwe> wrote in message news:840b97dcf1e0a@uwe...

[Dave in Houston]

> "Tutawl" <u43547@uwe> wrote in message news:840b97dcf1e0a@uwe...

>>I have a double wide trailer that I recently had a freestanding pole barn-
>> type metal roof put over. The trusses are approximately 1.5 ft. above
>> original metal roof on trailers and sides come down to just past the
>> original roof edges. From sides of new roof to trailer is about 16 in.
>> which
>> I am in the process of installing vented soffit. I plan to put vents in
>> the
>> gable ends and on the roof surface if needed. The question is when I had
>> the metal roof installed it was not insulated. When I enclose the roof am
>> I going to have problems with condensation on the bottom side of new roof
>> with it
>> enclosed like this or are the roof vents and soffit going to give it
>> enough ventilation ? Or am I going to have to insulate the bottom of the
>> new roof to stop condensation? P.S. I live in central Illinois if that
>> has any bearing on your answer.

If you are installing continuous soffit venting then I'd would go with
continuous ridge venting and skip the gable vents.

Dave in Houston

[Raider Bill]

On May 13, 8:49 am, "Dave in Houston" <DeeJayEmCee...@att.net> wrote:
> > "Tutawl" <u43547@uwe> wrote in messagenews:840b97dcf1e0a@uwe...

> Dave in Houston- Hide quoted text -
>
> - Show quoted text -

I read that if you have soffit venting then you should not have gable
vents too. Something about hampering the airflow.

Next trip to Tenn I plan on putting a metal roof on the house I'm
building. I was going to put 1x4 slats on top of my felt for air flow
but have been told that this will invite condensation.
The more I read the more confusing it gets as many now say do not vent
your attic.

[jimbobm...@verizon.net]

On May 12, 10:48 am, "Tutawl" <u43547@uwe> wrote:

http://www.metalroofing.com/v2/forums/?metalroof

this site has a lot of metal roffing info.

[Tutawl via HomeKB.com]

Well with ridge vents and soffit vents do you think I would get condensation
between the two roofs?

Dave in Houston wrote:
>>>I have a double wide trailer that I recently had a freestanding pole barn-
>>> type metal roof put over. The trusses are approximately 1.5 ft. above

>[quoted text clipped - 11 lines]

>>> new roof to stop condensation? P.S. I live in central Illinois if that
>>> has any bearing on your answer.
>
> If you are installing continuous soffit venting then I'd would go with
>continuous ridge venting and skip the gable vents.
>
>Dave in Houston

--
Message posted via http://www.homekb.com

[Raider Bill]

I'm not sure. I thought having a air gap between the metal and my felt
was a good idea but survey says condensation will result.
>
> --
> Message posted viahttp://www.homekb.com

[hogheavenfarm]

I have a very similar situation. I have a truss roof placed directly
on top of a short kneewall on top of a single wide trailer. The
trailer roof is insulated with R11. The 'attic' is vented by a
continuous ridge vent with perforated soffits. I have experienced no
problems with this setup. Due to rising fuel costs this past winter, I
added R38 insulation directly on top of the old trailer roof, between
the studs.This was quite effective, but expensive (this is a 65
footer). I also insulated between the rafters with R21. Unnecessary I
know, but I have found the heat buildup in the 'attic' was excessive,
and I wanted to stop it at the source (My roof has a Southwest
exposure). I used something called 'rafter-mate' , a foam channel that
directs the soffit air up and out the ridge vent. So far this has
worked very well.