Anyone ever put a sprinkler on your roof to help out your A/C on unusually hot days? Just wondering if it helps.
HVAC – Would Putting a Sprinkler on Roof Help Cool Home?
energy efficiencyhvacroof
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Replace the new roof. Clearly you chose wrong in a transparent untinted roof. It is possible that a stain/dye of some sort (applied to the underside of the roof) might be able to block some sunlight, but I expect that it will bleach out far too quickly from that sunlight.
If replacing the roof is not acceptable, then you might need to add vents to encourage more circulation.
You can use a program to calculate the angles for your desired gambrel shape. Here is one such example:
http://www.easyrafters.com/gambrel.htm
As @Skaperen says, a basic gambrel is nothing more than 1/2 of an octagon.
Gambrel Types Easy Rafters groups gambrel roofs into two categories, regular gambrels and custom gambrels.
A regular gambrel is one that fits inside a circumscribed semi-circle as shown below (the shape of the roof is essentially one half of a regular octagon). The slopes for a regular gambrel roof are fixed at 28 31/32 over 12 for the lower rafters and 4 31/32 over 12 for the upper rafters (these slopes are rounded to 29/12 and 5/12 for display) and the length of each side or face will always be equal. Whenever the lower span dimension is changed the other dimensions are automatically recalculated to maintain the same regular proportions.
Custom gambrels on the other hand allow complete flexibilty of design without the constraints of the regular gambrel option.
Regular Gambrels
A regular gambrel fits inside a circumscribed semi-circle.Custom Gambrels
Best Answer
I live in south texas, last week we had a terrible heat wave, temperatures outside where in the 110F-115F range, I installed a wireless thermometer on the attic and it read 130F on the hottest days. Ac would not cut off when set at 77. Went to home depot, got a set of 3 sprinklers that you can connect in series, I had an extra 24v solenoid water valve around and connected it to the roof sprinklers, I had to make a timer that would turn the sprinklers on for 10sec every 3 min (im an industrial engineer so making one was no trouble) and wallaa! Temperature read 98F on the attic when just a few days ago it was 130F with an outside temperature of 110F. BIG HUGE difference and guess what, my ac is cycling on/off finally on the hottest days! Im now running the system only at the peak sun hours of the day, I have no water run-off cause it all evaporates.