Quote:
Originally Posted by j_abdeen
Dear AC_Hacker,
I used the calculator on the link, consider total heating degree days 1069c ~= 1924f, and U values from Jordan Building code 2002 Uroof = 1 W/m2.k, Uwall = 1.8 W/m2.k. convert to R then to imperial by divide by 0.176 result in 91K BTU/hr (8 tons).
I prefer to enhance insulation first, the problem is walls, and ceiling are almost finished. do you have any recommendation? have you ever heard about supertherm from SPI coating, is it feasible and practical?
Regards
Jibreel
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Something is not right here. The u-values you have reference to here are those typical for an unfinished steel building, such as a grain silo or hangar bay. Single pane glass windows have a u-value around 1.2, double pane windows are around the same value as bare drywall at 0.5-0.7 Watts per square meter per degree Kelvin...
IIRC, most urban buildings in Amman are sheathed in white sandstone or textured concrete. Even a solid stone or concrete shell of a house with no interior finishing would have a u-value below 1. For an armchair consideration, let's assume your lower level is white sandstone and you want the upper level walls to look the same from outside. A 25 mm veneer would have a u-value near 1. Add 100 mm of structural framing and your choice of insulation behind it, with drywall interior surface. The composite u-value for the assembled wall section would lie between 0.05 and 0.08, depending on construction details.
As always, the more details you provide about your real world conditions and methods will help us to get you the information you need before you make expensive mistakes. As with any real property project, having a properly detailed and scrutinized plan before labor is performed will save you big money and labor hours during construction. Having to tear down and rework something during the process can literally send your budget into the heavens.
As for the super-insulating super therm paint, I offer you a case study:
http://www.greenbuildingadvisor.com/...is-own-product
The short story: reflective paint does not count as insulation. Same story as the space blanket bubble wrap.