i see your down to probably an R value of 3 up there.
R-value of 3/4" Plywoood is 0.94
R-value of asphalt shingles is 0.44
Total est R-value of roof is 1.38 (maybe up to 2.0 including tar paper).
R-value of the attic ceiling is irrelevant.
We run central A/C (furnaces don't exist here) 10+ months out of the year. If heat is used at all, it is literally one or two days out of the year, due to frigid temperatures (60F is COLD!)
http://venting.sustainablesources.com/ That link gives a bit more info on soffit/ridge ventilation. The point is literally to remove as much heat as possible, not keep it in.
:deadhorse1:
According to the general contractor, practicing engineer, and A/C guys i talked to, venting to the attic is OK because:
1. Due to the soffit/ridge vent design, the attic space is considered "open to the outside air", and not an "enclosed space"
2. The exhaust is NOT from a dryer or range vent, so lint or oil buildup is not a concern (which is why they need dedicated vents.)
how is the algae scrubber doing
There is some browning, and decent adhesion, but without any significant amount of nutrients, I cant really expect much more. It is currently in waterfall-only mode so i can keep track of my evaporation and water level.
I want to put an auto-topoff on there, but i don't think the repetitive surge would play well with a float switch.
The lights on the scrubber came from Ebay via China. They are 8x 3W red and 4x 3W blue. I don't remember exactly what the wavelengths are. Once the nutrients get up a bit, if I don't get the growth i want, I'll end up building supplemental lights out of 660nm reds.
@montiporalova: If i were still married, I am quite certain none of this would exist (her walk-in closet is now a microalgae-grow room! :dance: )
Not advocating divorce in any means, but being right 100% of the time
does have some benefits lol.