100

[den]

My weather station tells me it hit 100F at 3pm. It was a bit hot in the factory today, under that tin roof.

Comments

[brucebergman.livejournal.com]

Lawn Sprinklers on the roof can help. Keep the heat from radiating in.

Add lots of attic insulation to keep the heat from from radiating down. Most of our industrial buildings are poured concrete "Tilt-Ups" with wood framed flat roofs, and they use radiant foil insulation - but Spec-built buildings they add fiberglass batts too. (Costs more, not required by Code, but makes a HUGE difference in HVAC costs.)

For steel framed industrial sheds you need to use the spray isocyanurate foam insulation on the inside of the roof, and/or the spray foam roof coating to add a few inches of insulation on the outside. (And it keeps the roof from rusting.)

And lots of turbine ventilators to get the heat out of the rafters.

If you own the building instead of renting, approach The Legal Owner (Dad) or the /Real/ Owner (Mom) ;-) with firm figures on how long the payback period is. They might let you fix it.