Pole Barn Liner With Spray foam

[Doctor2034]

Hello All,
I have an older Limbaugh pole barn, 40x60x12 with scissor trusses. I had the walls and roof interior sprayed with closed cell sprayfoam. I am now considering liner material for the walls and possibly ceiling. My trusses are 8 feet on center. What is the best material? I am considering metal vs plywood vs OSB. How can I tell if the trusses will handle the weight of a ceiling? Is it ok to put a liner ceiling after spraying roof panels?
Thank you for your help.

 

[Dixie_Flatline]

My dad used metal in the ceiling of the tractor barn since it was lighter than OSB and he wasn't sure the trusses could support any weight. Sheet of standing seam metal is nothing compared to a similarly sized sheet of OSB or ply. Anything thin to save on weight, like 1/4 plywood, will just start to sag in time especially dangling from 8 foot spans with no other means of support. I am no engineer, but battens and metal sound like the way to go if there is a need for a ceiling.

 

[Doctor2034]

Thanks. I am considering metal.

 

[jblnut]

Most anything you put up there on an 8’ spacing set of trusses will need something in between the trusses to support the ceiling. In all my pole sheds with ceilings there are 2x4’s attached to the trusses with metal hangers and are spaced 2’ (I think) apart. The ceiling is then attached to the 2x4’s.

I have roof steel on my walls and ceiling. If you intend to hang stuff on the walls plywood may be a better option for all or part of the walls.

 

[Jakemedic]

My trusses are 4’ on center, so I’m not sure about 8’. Probably recommend using 2x4s on the flat across the ceiling. As the above poster listed, I used plywood on the walls to the 8’ mark, then a piece of flashing and finished it with metal. It was cheaper than the plywood per square foot, and makes the interior interesting to look at.

 

[racecougar]

Agreed that you'll want additional framing to reduce the span of whatever sheeting you choose. I ran SYP 2x6's between my trusses to attach the liner panel to, but I had my trusses engineered for the load. Do your trusses have tags/stamps/any identifying info on them?

 

[Doctor2034]

Thank you all for the info. No tags or stamps. Is it OK to put steel on trusses if the roof is sprayfoamed, or will it condensate?

 

[kj_mustang]

Thank you all for the info. No tags or stamps. Is it OK to put steel on trusses if the roof is sprayfoamed, or will it condensate?

Depends. What is your location's humidity level like on a year round basis? Is the future attic space totally unvented to the exterior? Is the interior space going to be a totally conditioned space, ie heat and ac?

 

[finn]

Thank you all for the info. No tags or stamps. Is it OK to put steel on trusses if the roof is sprayfoamed, or will it condensate?

Just read a couple of days ago where mortgage companies in England are turning down financing, in some cases, if the building has closed cell spray foam. I think they specifically are talking about the ceiling.

Seems there was funding available to improve the energy efficiency of existing buildings. Now several years later, the closed cell foam is trapping moisture in the rafters, trusses, and purlins and they are rotting in place.

They aren’t as concerned with open cell foam, since any moisture, presumably from roof leaks, although there was no definitive explanation, can be detected and remediated before there is structural damage.

I don’t know how widespread the issue is, but it’s interesting that there was somewhat of a debate about this here on this site in the past.

I don’t know if there’s call for alarm, but I do know that barn roofs invariably leak, given the thousands of piercings from the screws and the fact that the washers inevitably relax as they age. I also know that closed cell foam doesn’t drain.

 

[Doctor2034]

Depends. What is your location's humidity level like on a year round basis? Is the future attic space totally unvented to the exterior? Is the interior space going to be a totally conditioned space, ie heat and ac?

we have hvac and will have the temperature around 50-60 degrees in winter and 70 in summer.

 

[Cougar]

Can you check with the manufacturer on what the trusses can hold.
I have a Cleary on 8ft centers.
When I wanted to insulate the ceiling, I checked with them.
They said the way it was constructed; I couldn't do it. It wasn't built to have a finished ceiling.

 

[Doctor2034]

Thank you