I have a client who needs your help. In the early 80's, he and his wife built a beautiful off-grid home on a small island near Fort Myers, FL. It currently serves as a convenient getaway, but as they…Continue
I think the finish edge application is critical but several un-knows exist. Such as how far does the edge overhang and what does the enclosure need to look like in relation to the rest of the house? What is the wind uplift condition to…"
"Hi John, thanks for pointing out my faux pas: I made clear in my original post that rainwater collection is a critical requirement, thus my follow-on comment that a steel over-roof would be overkill is clearly wrong.
I'm sure the owner would…"
"I'd recommend a reflective roof. Depending on their expected usage of this building, a reflective elastomeric roof paint such as "Kool Seal" might be sufficient without adding another roof surface or insulation. …"
"The solution maybe installation of foam fill panels between the existing raised metal ribs within the existing metal roof, then support rails with a polyiso fill with a new metal roof. Working previously in the roofing field I found that not all…"
"Hi Mike, it's good to get some feedback from the field, and thanks for confirming Gen 3 is now shipping. Sanden's website still says "coming soon"
Re: heat tape... it would be ashame to use heat tape (with COP of 1) to prevent…"
"theoretically, let's say you perfectly isolate the HPWH from a heat source. The HPWH's will eventually cool the air to the point that mold will grow. Here's the math:
30x30x8 = 7200 ft3 x 0.075 lbs/ft3 = 540 lbs of air
540 lbs x 0.24…"
"Interesting idea. Commercial roof on a slope!
Typical density for roofing spray foam is 2.5 to 3.0 lbs/ft3, depending on expected foot traffic, with R-value of about 6.5 per inch.
On 'flat' roofs, the mix is normally set for a slower…"
"You might consider a commercial grade roof foam spray (higher density than normal CC Foam) with a coating over that - if they want metal over that, that's fine as there are some special clips & rails they can use but the clips need to be…"
I have a client who needs your help. In the early 80's, he and his wife built a beautiful off-grid home on a small island near Fort Myers, FL. It currently serves as a convenient getaway, but as they approach retirement, they want to install a limited amount of air conditioning in the form of a couple of small, high-SEER ductless mini-splits. The aging 12V PV system is quite small -- the refrigerator is propane powered, and there's no well (fresh water supplied by rainwater collection). So…See More
"Regarding Sanden... US distribution is fairly new so I imagine they make it easy to set up an account, or would sell direct. The plumber would have to be on board, though.
The current model is good to -15F, and the forthcoming Gen3 is good to -20F…"
"Yes, now that I've taken time to make sure I understand the physics, I'm in full agreement.
Consider that with an air-air heat pump or A/C, the heat rejected by the condenser is roughly the same as the heat absorbed by the evaporator. A…"
"Since others reactivated this thread, I'll chime in. In recent years I been including DHW distribution in my design review conferences. As others noted, each house is different, requiring its own solution.
The device Sean mentioned in the OP…"
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