Started 40x60 Shop Kitsap

[Hurricanoday]

They are about a week into my shop and wanted to post some pictures with updates. Once I got passed the stormwater stuff with the county the permit was pretty easy. Gonna end up having to do a 34ft 2x2 dispersion trench that runs in my back pasture.

Also when I had a dozer come in there was an issue with there being some extra fill and the company wanting to charge me a lot of money for the extra depth but we got that worked out for 350 vs 1400.

Here is a link to my other scouting threads

http://www.garagejournal.com/forum/showthread.php?t=352280

http://www.garagejournal.com/forum/showthread.php?t=349549

http://www.garagejournal.com/forum/showthread.php?t=337417

The shop is 40x60x14 (13 clear height) with a 18x10 and 2 10x10 on the 60 side with a 12x12 on one 40 side. Already had some fun with a hole inspection, the county came out and said they needed to take more of the loose dirt out or the building "will sink" They also wanted me to spread more money I mean hay around the building site to stop "erosion" I can see it on the hill but in my driveway where the skid and trucks are going seems a little much. So I spread some more and they came back the next day. All was good.

They have the holes set in concrete and the trusses ready to go.

Here is a link to some pictures
https://1drv.ms/f/s!AlgP6uKv3xDFhxR89K6SqeHKxAng

I have been reading about trusses and being engineered for storage/attic. When the builder asked me if I wanted to be up there I said no. But from I am reading I should have told them I wanted to do a ceiling? I don't plan on using the space for storage or second floor but I would like to do something like the white metal inside panels or other cheap options I have seen on these forums. Not sure if I am gonna spray foam or blow in insulation. Plus also some lighting

The trusses say 25-5-0-1 (picture 23 what are those numbers?) and 10ft apart, building is rated for 25lb and 110 wind. Not sure what 72" on center means.... Will I be able to do something for a ceiling?

 

[matt_i]

Unless you do the metal skin, which I think is 48" on center for trusses, drywall would require trusses set 24" on center.

Its not too late to change, they can just order more trusses of the same style at extra cost and possibly some delay, but I've read many lamentations of several people who wished they could go back to this step and have extra trusses added.

 

[Hurricanoday]

Unless you do the metal skin, which I think is 48" on center for trusses, drywall would require trusses set 24" on center.

What does this mean? and why couldn't I put some metal panels on the trusses that they are using? I don't think I want to wait for new trusses to be built

 

[The Tool Tyrant]

You should have received a packet with truss drawings / layout plan / engineering calcs, etc. Take a look at those for more specific information.

 

[Fasthotrod]

Unless you do the metal skin, which I think is 48" on center for trusses, drywall would require trusses set 24" on center.

Its not too late to change, they can just order more trusses of the same style at extra cost and possibly some delay, but I've read many lamentations of several people who wished they could go back to this step and have extra trusses added.

What does this mean? and why couldn't I put some metal panels on the trusses that they are using? I don't think I want to wait for new trusses to be built

What he is saying is that if you wanted to use drywall for the ceiling (cheap option you asked about in your original post) then the trusses would need to be a minimum of 24" vs. the 48" apart because drywall will sag unless properly supported... which is a minimum of 24" on center. He thinks that metal panels can be spaced 48" apart, which would not require additional support.

The numbers on the truss typically represent the type of loading that can be placed on it. Odds are, these are the maximum loads on the top chord and bottom chord. (Live and dead loads.)

If you have a 25-5-0-1 truss with 72" spacing, then it more than likely means:

TC Live = 25 psf
TC Dead = 3 psf
BC Live = 0 psf
BC Dead = 1 psf

So TC Live means the live loads on the top chord. TC Dead is dead weight on the top chord. Dead weight usually doesn't change over time, which is typically the weight of the materials used to build the roof that sits on top of the top chord. A live load would be the people walking around on the roof putting the materials on it, or performing an inspection on it later down the road.

The bottom chord is what you need to be concerned with if you wanted to put in a ceiling. Absolutely NO live weight can be on the bottom chord. So no available attic space to crawl in, nobody hanging from the bottom chord, no stringing up deer by a rope to dress out, etc...

Dead load is 1 psf, so you have to use relatively light weight materials on the ceiling so as not to exceed this rating. A sheet of drywall is about 1.6 lbs/sqft, which exceeds the loading of the bottom chord.

A metal panel will more than likely be less than this... Panel-Loc Plus is about 0.866 psf for 26 gauge, and 0.704 psf for 29 gauge. So if you had a sheet of 29 awg metal that was 3' by 10' (30 sqft) then it would weigh approximately 21.12 lbs. Your trusses can support 1 psf, or 30 lbs over this area. You could safely add up to 8.88 lbs in this same area (lighting and/or insulation) that will be supported by the ceiling as well. (Assuming that your trusses are 72" on center. If they are closer together, then this number will go up slightly.)

Fiberglass insulation varies on weight based on material/thickness. I looked at some quick charts, and an R-13 value would be about 0.196 psf at 5.7" thick. (5.88 lbs over 30 sqft.)

So yes... if you wanted to install an insulated ceiling with lighting then you should have specified this up front. Adding additional trusses will help with supporting more weight, as would a different truss design. As it is right now, you have some options for a ceiling, provided that you do the homework on the spacing, available loading, weights of the materials used, etc...

Good luck!

Mark

 

[Fasthotrod]

The trusses say 25-5-0-1 (picture 23 what are those numbers?) and 10ft apart, building is rated for 25lb and 110 wind. Not sure what 72" on center means.... Will I be able to do something for a ceiling?

72" spacing is the designed space between each truss for the given loading.

Looking at your picture, it appears that they doubled up the trusses at each post vs. installing them at 5' on center:

https://b1lqxg-sn3301.files.1drv.co...KGWIrkDVmyAyKqNLs2/20170218_152403.jpg?psid=1

The question now becomes, how can you span the 10' space between each set of trusses to safely install a ceiling?

Time to consult an engineer...

 

[Hurricanoday]

I will take a look at the drawings. I plan on just screwing the panels right into the trusses and if they need some support maybe adding something long ways. I really didn't want to add the extra expense, I just figured that the metal wasn't that heavy and small led lights wouldn't be a problem.

I have read both sides, the trusses should handle a little bit of extra weight and the other side saying the building will fall down.