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Crawlspace Encapsulation Zone 3a
**Details:**
\- Single family 2 story modular home in North Carolina. County uses the 2018 NC Residential Building code (IRC 2015 w/ Amendments).
\- The crawlspace is rectangular in shape and measures \~1460 sq ft. with an average height of 4 ft. (The crawlspace is 2ft on one end and 6 ft on the other).
\- Landscape slopes \~4° from one end of the house to the other. The crawlspace follows the same slope.
\- As I'm sure you can guess, it's pretty damp in the crawlspace. HVAC trunk duct regularly sweats, as does the refrigerant lines. Mildew/fungal growth is present on the underside of the fiberboard installed to the bottom of the floor joists.
\- Some mold growth has been seen around the floor penetration of the HVAC trunk duct and condensation has been seen on nails and screws penetrating the subfloor. The air handler sits inside the conditioned space while the duct work is below the floor in the crawlspace.
**Questions:**
1. NC Code requires the installation of a sump pump. In my research it seems like a drainage system is recommended or required for proper management of water under the plastic. I plan to install dimple underlayment. Is this enough or should I install additional drainage around the perimeter that is routed to the sump? The crawlspace already has a natural low corner that is perfect for the sump install.
2. I'm between using a dehumidifier or supply air (Sections R409.5.1 and 2). I intend to insulate the walls and remove any floor insulation. What are the pros and cons of each option given the insulation plans? Maybe a combination of the two options?
#home
source
**Details:**
\- Single family 2 story modular home in North Carolina. County uses the 2018 NC Residential Building code (IRC 2015 w/ Amendments).
\- The crawlspace is rectangular in shape and measures \~1460 sq ft. with an average height of 4 ft. (The crawlspace is 2ft on one end and 6 ft on the other).
\- Landscape slopes \~4° from one end of the house to the other. The crawlspace follows the same slope.
\- As I'm sure you can guess, it's pretty damp in the crawlspace. HVAC trunk duct regularly sweats, as does the refrigerant lines. Mildew/fungal growth is present on the underside of the fiberboard installed to the bottom of the floor joists.
\- Some mold growth has been seen around the floor penetration of the HVAC trunk duct and condensation has been seen on nails and screws penetrating the subfloor. The air handler sits inside the conditioned space while the duct work is below the floor in the crawlspace.
**Questions:**
1. NC Code requires the installation of a sump pump. In my research it seems like a drainage system is recommended or required for proper management of water under the plastic. I plan to install dimple underlayment. Is this enough or should I install additional drainage around the perimeter that is routed to the sump? The crawlspace already has a natural low corner that is perfect for the sump install.
2. I'm between using a dehumidifier or supply air (Sections R409.5.1 and 2). I intend to insulate the walls and remove any floor insulation. What are the pros and cons of each option given the insulation plans? Maybe a combination of the two options?
#home
source
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