Ridged Insulation under a steel roof?

[Industrial Toys]

Could animal waste play a part in that?

 

[RickB]

Could animal waste play a part in that?

Play a part in the original roof only lasting 42 years? I suppose it did, although the building has good ventilation. The steel structure is still sound.

 

[Industrial Toys]

Sorry, I lose track of time. I keep thinking that it's still 2000 or so. I somehow thought, you implied it failed prematurly.

 

[RickB]

Sorry, I lose track of time. I keep thinking that it's still 2000 or so. I somehow thought, you implied it failed prematurly.

No worries, you have plenty of company in that regard.
Point being, in an unheated dry storage situation I would not think twice about placing roofing steel directly on rigid insulation.

 

[Industrial Toys]

It is dry and mostly unihabited, plus virtually never heated. I guess, being better insulated might change that a bit, but I wouldn't bet on it.

Anyone know much about shiplapped SM?

 

[RickB]

That bit of insulation will not materially change the temperature but will eliminate condensation due to ambient temperature fluctuations.

 

[herm0016]

do you mean xps extruded polystyrene? shiplap is just an edge profile that fits with the next sheet. that would not matter in your install.

 

[RickB]

do you mean xps extruded polystyrene? shiplap is just an edge profile that fits with the next sheet. that would not matter in your install.

I would use shiplap or T&G profiled rigid panels for the simple reason that they will stay connected and even indefinitely. I can't imagine a downside to using either style.

 

[mikester]

Steel sweats like crazy in springtime so make sure you are water tight beneath the deck. I'd recommend spray foaming under the metal if you can. I have an all steel barn and before I insulated it would literally rain inside on those nice humid days after cold nights.

Those guys that tell you it's ok to install a new steel roof overtop an old leaky roof should be tarred and feathered on the spot. Scammers.

 

[Industrial Toys]

When my shipping container was out in the open, it rained in there too. Actually, my steel wood shed does that. Most annoying.

I hate when evry single thing in the garage/shop is sweating from temperature/dewpoint changes. Happens two or three times a year. Hoping I can control the temeperaure better and easier with insulation.

Contractor should be here soon. thanks for the input.