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Posted by geoman on August 9, 2006, 8:41 am
> "geoman" wrote:
>
>> Have to quote a job that has those big church beams and 2 x 4 tongue
>> and
>>grove hardwood between them.
>>
>>The problem is, its a flat roof, the boards won't support (at least I'm
>>not
>>chancing it) a roof top unit.
>>
>>I was thinking, straddle it across the big beam, supply on one side and
>>the
>>return on the other and then run spiral metal duct.
>>
>>If this can't be done, does anyone have an idea how we can put a beam on
>>the
>>flat roof that would extend from one beam to the other, somehow build a
>>curb
>>from that and put the unit on it? I guess I'm asking for experiences
>>before
>>I go too far into the quote.
>>
>>Rich
>>
>
> Rich I have tons & tons of experience in what you're asking about.
> Are you positive its 2x4 t&g or 2x6? A full 2" or 1.5"?
Fish, Its a full 2 x 5 with insulation decking over that.
>
> Yes, feel comfortable straddling the beam with one pkg unit, sa & ra
> on either side of the beam, esp if the unit weighs 700 lbs or so. No
> more than one unit per beam.
Thats what I was thinking, and keep it as close to a support wall or post,
right?
>
> As far as putting beams on the roof and building a curb up from that,
> not a problem! I put a 15 ton on a flat roof, mid way between 2
> 4x12 purlins. The purlins were 20' long and the span between them was
> 8 feet, centerline. On the roof I put down 6x8 beams 8 feet long,
> from center of purlin to center of purlin. On the 6x8's I mounted the
> factory roof curb, then custom fabricated sloping plywood panels from
> the roof to the top of the nailer on the curb. Mr roofer tied it all
> together using 90# torch down granulated cap sheet. I got some killer
> pix I can email you, showing the whole she-bang.
That would be nice if you could send them too me. Let me make up a temporary
email and post it sometime today. I've been flooded with spam and havent had
much time lately to deal with it. I will post a junk email later today,
>
> As for the spiral.......forget that. since its a church, high
> profile, a lot of exposure, talk them into using DuctSox
>
> http://www.ductsox.com/
>
> Its a little pricey, but wow, talk about good looking, super easy to
> install, throw in the washing machine to clean......recently partnered
> with another contractor on a church bldg like that, 4 5 ton hp's
> blowing into 4 40' long ductsox. air disperses on each side of the
> ductsox, at about a 45 degree angle down
This is definately something I will look into, a LOT lighter as well and no
cutting etc. After labor its probably cheaper too.
ThanksFish
Rich
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