New house, spray foam attic, gas heat and water heaters
I am building a new house and want to foam the roof. I also want to use gas heat and water heaters.
The HVAC rep states that they pipe air to the units to meet code. Does that sound about right? Does that majorly break the roof 'seal'? Is that different from sealed combustion?
Also, it doesn't look like I can use standard NG water heaters. From what I have read it needs to be direct-vent. Is that right?
Direct-vent water heaters are around $1k versus $400 for standard NG. Tankless gas heaters are a little cheaper and they all say direct vent. Would one or two of those be the way to go? Can the foam be sprayed directly on the direct vent pipe?
Basically trying to figure out most economical way to get both foam roof and gas appliances ...
Thanks for any tips.
Posted Wed, 02/12/2014 - 21:46
Edited Thu, 02/13/2014 - 10:10
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