Possibly have the roof coated with a white spray foam insulation such as:
http://henry.com/sprayfoaminsulation/roof/roofsprayfoam
--- In DoIt_Yourself@yahoogroups.com, "mountain953346" wrote:
>
> We have 2000 sq ft roof that is composed of 1x8's over
> 4x8 on 8ft centers, then asphalt roll and tar covering the 1x8's.
>
> That's it. There is no insulation and we are loosing most
> of AC and heat through the roof.(It is a low-slope "flat" roof)
>
> We have computed the costs for doing a new inside the house drywall
> ceiling dropped down 3 1/2" with r-15 fiberglass insulation
> at about $1.25 a sq ft. minus labor..having done drywall
> before we are confident to do the work although it seems
> a lot more intensive than adding new roof...??
>
> Add roof approach is to add 2x4s on 16in centers on the roof
> and put insulation there, then cover with 3/8" CDX and asphalt
> roll roofing over that which is now on the existing roof
> (maybe 25 year old roof now so could use a replacement)...
> essentially making a new roof....we also have done DIY
> in this area. Costs of materials about the same.
>
> It seems to me that the roof approach is way less labor
> intensive than beaming the inside ceiling, juggling
> even lightweight drywall, insulating and screwing and taping
> and mudding the inside ceiling...
>
> I would be very interested in the DIY'ers thoughts on the
> approaches to this project...or a new approach we have not
> thought of to solve this upward massive energy drain. In the
> summer the ceiling inside is a virtual radiator. We live
> in San Diego away from coast 15 miles so it gets hot but
> does cool off at night (semi-desert climate).
>
> Thanks in advance for any and all thoughts and ideas.
>
> Rich and Kate.
>
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