Should I spray foam my metal building?

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Closed-cell spray polyurethane foam (SPF) insulation offers a unique set of benefits that can help owners of metal buildings or pole barns in a number of different ways. When deciding on the type of insulation material they should use, our Colorado clients have determined the following benefits as their top reasons to use spray foam:

Closed-cell spray foam in a Colorado pole barn.

1. Powerful Insulator

Thousands of fasteners and welds intersecting with hundreds of beams and metal panels conduct heat into and out of a metal building, causing most other insulations to be less effective. Spray foam not only insulates the structure well but because of its expansive nature, spray foam tightly seals all the nooks and crannies that otherwise would have been left exposed, and eliminates thermal bridging concerns. Do you want spray foam insulation in your existing metal building but don't have the time or energy to clear it out? - Consider a spray foam roof!

2. Incredible Energy Savings

Research performed at Oak Ridge National Laboratory (ORNL) in 1996 concluded that similar R-values of closed-cell spray polyurethane foam installed between metal studs in wall assemblies were 20% to 30% more energy efficient than fiberglass batts installed in similarly constructed wall assemblies. - This test did not even include factors such as air infiltration, but only heat transfer!

3. Air-tight Seal

Spray foam expanded through the gaps of a metal building; eliminating the chance of air & moisture intrusion. Air sealing tops the list of the most cost effective ways to save energy. Gaps, cracks, and penetrations are where air leaks occur and are often the culprit of high energy bills and overall discomfort. Spray foam insulation fills in those crevices and voids, completely air-sealing around the through penetrations such as vents, pipes, stacks, structural supports, drains, and the like.

4. Moisture Barrier

With metal buildings, it can prove challenging and costly to identify and locate water leaks due to the irregular surfaces, angular corners and junctions. Flashings tend to move, increasing the potential for water leaks that may be hard to detect and to stop. Closed-cell spray foam conforms to the irregular surfaces, corners and junctions, forming a fully adhered, seamless waterproofing membrane that helps eliminate leaks. Most people don't know that spray foam is also a roof which can be applied on nearly every existing roof substrate; learn more here!

5. Deters Mold

Spray foam is composed of an inert polymer that won't allow growth of mold or bacteria. This promotes better indoor air quality and a safer environment to work in.

6. Structural Strength

A topic of concern for many metal building owners is not having the ability to remove damaged wall panels after spray foam has been applied. Closed-cell spray foam has a high compressive strength. As a result, it will not only increase the structural integrity and rigidity of metal buildings, but protect the building, too. - In terms of cost, the replacement of wall panels on a metal building can cost $10 to $13 per square foot. In contrast, a closed-cell spray foam application only ranges from $3 to $5 per square foot; Less than half the cost.

7. Eco-Friendly

Spray foam is considered "green" because it reduces energy consumption, protects against mold and is designed to last a very long time, producing fewer consumed materials that would otherwise end up in the landfill.

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Does a shed need a disconnect?

You'll need a disconnecting means at the shed to satisfy 225.31; however, this can be a simple light switch in a weatherproof box or just inside the shed, nothing fancier is needed for a single branch circuit. You'll want the receptacle to be GFCI-protected, by the way, due to the fact this is an unfinished space.

diy.stackexchange.com - Electrical Circuit for Detached Shed 200 ft

Yes, you can run a single branch circuit to a structure

Considering you only need a single branch circuit there, you can run a single branch circuit out to your shed with say 10AWG for hot/neutral/ground, or hot/hot/neutral/ground if you want to run a multi-wire branch circuit. The exception to 250.32(A) means you won't need a ground rod at the shed as the equipment grounding conductor to the main structure is a sufficient grounding means for a single branch circuit. You'll need a disconnecting means at the shed to satisfy 225.31; however, this can be a simple light switch in a weatherproof box or just inside the shed, nothing fancier is needed for a single branch circuit. You'll want the receptacle to be GFCI-protected, by the way, due to the fact this is an unfinished space.

However, I'd trench in a fat conduit anyway

Renting a trencher for the day isn't cheap. Schedule 80 PVC is, even in say 2 or 3" diameter. This means that while you're digging, you might as well put in a fat PVC conduit to the shed even if you're only running a few 10AWG THHNs in it, instead of using a direct bury cable, as the conduit will make expansion way easier. Besides, Schedule 80 is going to hold up to an inadvertent excavator encounter better than a UF cable anyhow.

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