12' Span between Trusses. How to Prepare for Drywall?

[sberry]

1000 ft ain't much. It's not tiny but it's not huge either where each side takes week. In some fairness the Morton job included a lot of **** and finish. They ain't in the biz to do 1$2.95 diy type insulation in little buildings. Kind of comparing apples and oranges a bit too.

 

[sberry]

This could be a weekender type thing for a couple handy guys to screw and glue up some sheets. Tape the joints.

 

[mike93lx]

This could be a weekender type thing for a couple handy guys to screw and glue up some sheets. Tape the joints.

Screw to what?

 

[danieldd]

If it is a Morton, I would contact them and get their recommendation for a ceiling. I bet they have the engineering data on the trusses.

I will be calling them tomorrow specifically about the trusses. I looked at the trusses last night and can't find any specifications on the trusses themselves. I do know they are 2x8 both top and bottom chords and the purlins are 2x6.

In another thread I reached out to Morton and got a ridiculous quote (~$20K) from them to insulate, so they must have figured out a way to reinforce the trusses for a tin ceiling.

 

[Firebrick43]

I will be calling them tomorrow specifically about the trusses. I looked at the trusses last night and can't find any specifications on the trusses themselves. I do know they are 2x8 both top and bottom chords and the purlins are 2x6.

In another thread I reached out to Morton and got a ridiculous quote (~$20K) from them to insulate, so they must have figured out a way to reinforce the trusses for a tin ceiling.

Or set an additional truss between the others! That would make more sense on the cost

 

[HotrodHR]

Whereabout in the Rocket City?

 

[GMCGarage]

Why don’t the trusses fall on the posts.....asking for a friend.

Is that a door, so no post there?

 

[NUTTSGT]

Poly iso is twice as fire resistant as ep/xps

I wanted to call BS on this but I did a little reading. You're right.

A quick copy/paste.

https://www.polyiso.org/page/FirePerformance


Polyiso insulation delivers a high level of inherent fire resistance when compared to other foam plastic insulations due to its unique structure of strong isocyanurate chemical bonds. These bonds result in improved high temperature resistance (up to 390 degrees F; more than twice the temperature resistance of other building insulation foams) which in turn leads to enhanced fire resistance. In addition, polyiso products form a protective surface char when exposed to a sufficient flame source. This physical property is exhibited in the ASTM E84 or “Steiner Tunnel” test, where polyiso insulation test specimens remain intact (i.e., do not melt or drip) during the test’s fire exposure. This performance characteristic further enhances polyiso’s fire resistance, especially in terms of flame spread and flashover potential.

Self ignition of Polyiso 800-850F, OSB/plywood 400-500F


I am impressed.

 

[danieldd]

Called Morton this morning and asked about the dead load on the bottom chord of the current truss design in the shop. They are recommending (this is a 2nd opinion from another Morton distributor) NOT to install any kind of ceiling (drywall or tin) as the trusses were not designed for this type of installation. Appears the shop was originally designed to be a simple machine shed and not to be insulated.

So, this forces me into a position of having the interior space spray foamed with closed cell, which I am okay with.

My last shop was insulated and finished with drywall - ceilings and walls, painted and with RaceDeck as the floor covering. I was quite proud of that shop, but we have sold the house and moved on. I have to make due with what I've currently got. Insulating the shop is a must have. One thing I don't care for is the resultant look of the spray foam walls. I understand the foam is an off white color. I am hoping that I will be able to cover the walls with some type of wall covering, whether that is OSB or drywall. Anybody done this on a steel building?

 

[mike93lx]

You could paint the spray foam, maybe an intumescent paint for fire protection.

On the wall coverings, do you have girts already between the posts? If not, add them before the foam is sprayed and it will give you an easy way to put a covering on the walls

 

[abwehrly42]

I am in a similar situation. I found lots of good advice in this thread and want to get opinions about how to insulate my pole barn. It is 30ft wide and 32ft deep with trusses on 8ft spacing. The walls and gable ends have been spray foamed. The soffits are vented.

I like galute's solution in this thread:
https://www.garagejournal.com/forum/showthread.php?t=348292

If the recommended approach is to insulate between the purlins, how much insulation is enough? Location is East Tennessee; I would like to be able to heat and cool this space. Reclaimed polyiso foam is available locally in thicknesses up to 4.25". If I insulate the purlins how should I seal the soffit area?

 

[masterofall]

A suggestion for your ceiling. Use the same dimension lumber as the bottom chord of the truss and hang them to the horizontal ties that stabilize the trusses using huricane clips. The spanning lumber can be butted together and joined with truss style gang nails to reach uninterupted from end to end. Two foot centres with ultra light ceiling board. You might want some more horizontals from truss to truss to carry the extra weight.
If you are going to use poly ISO for insulation try a wallboarders buddy drywall cutter for cutting the sheets. Simply score the paper on both sides and snap it like drywall. There is no waste to clean up and the cuts are straight and clean.

 

[mike93lx]

A suggestion for your ceiling. Use the same dimension lumber as the bottom chord of the truss and hang them to the horizontal ties that stabilize the trusses using huricane clips. The spanning lumber can be butted together and joined with truss style gang nails to reach uninterupted from end to end. Two foot centres with ultra light ceiling board. You might want some more horizontals from truss to truss to carry the extra weight.
If you are going to use poly ISO for insulation try a wallboarders buddy drywall cutter for cutting the sheets. Simply score the paper on both sides and snap it like drywall. There is no waste to clean up and the cuts are straight and clean.

Hopefully he sorted it out in the last 2 years...