We've recently leased an office in a tropical climate and I am trying to figure out the best way to increase the insulation in the building.
So far I've researched:
- spray insulation (options are both inside and outside)
- adding additional insulation between the steel beams
But still not sure of the best method. There is a steel roof above the thin layer of insulation that is present.
It's in the Philippines where it's an almost constant 22-32 degrees celcius, and we do plan on adding air conditioning, so the insulation is really to try and get the general temperature down to cut down energy costs.
Best Answer
Spray foam insulation is one of the best options for insulating. It seals very airtight (losses from leaking air can be 40% of your energy bill) and can cover over metal and other materials that can "thermal bridge" and conduct heat from outside. It is expensive, and is generally applied by a professional which may put it out of your budget. It is also somewhat flammable and some areas require that it be covered by an ignition resistant material which might be difficult.
Next up would be solid foam panels tightly fit between the trusses. Third best would be more fiberglass batts like the ones up there already for a greater thickness. You are trying to increase the air tightness and the total R value.