The fastest growing town
sits on the wettest ground.
Crawl space encapsulation and moisture control across Millsboro and Long Neck — new subdivisions, older homes, and manufactured housing on the bay.
Thousands of new homes on a shallow water table.
Millsboro is one of the fastest growing municipalities in Delaware. Plantation Lakes alone is approved for a buildout approaching 2,500 homes, and it is one of roughly fifteen approved projects in town. Peninsula Crossing, Retreat at Millsboro, Somerton Chase, Alderleaf Meadows, Burtons Crossing. That is a lot of new foundations going into ground near the Indian River.
If you are buying in one of those communities, know this. New does not mean dry. A crawl space built to code in 2023 sitting over a water table this shallow, in this humidity, will still run above sixty percent relative humidity unless something is actively managing it. The wood is new. The physics are not.
We are under houses in these subdivisions regularly, often within the first few years. The most common thing we find is a builder-installed liner that was never sealed at the seams and a dehumidifier that either was never installed or was never plugged back in after a service call.
Manufactured homes are a different animal.
Long Neck shares the 19966 zip code with Millsboro, but the housing could not be more different. The peninsula between Rehoboth Bay and Indian River Bay is one of the largest concentrations of manufactured housing in Delaware. Pot-Nets has been building land-lease communities out here since 1962, six of them, with roughly five miles of waterfront between them.
Sussex County holds the majority of Delaware's manufactured housing communities, and a large share of them sit right here. That matters because a skirted underbelly traps moisture the same way an open crawl space does, and most homeowners have never been told to think of it that way.
Skirting is not a vapor barrier
Vinyl skirting keeps animals and wind out. It does nothing about the ground underneath, which is usually bare soil giving off moisture straight into the belly board and the floor above.
Torn belly board
The fabric underlayment sags and tears over time, often after plumbing work. Once it is open, insulation absorbs ground moisture and holds it against the floor system.
Waterfront means water table
Homes with bay access sit low. The ground under them stays damp even in a dry stretch, and there is no basement to buffer it.
Seasonal and second homes
A lot of these are used part of the year. Same problem as the beach towns — months with nothing running and nobody looking.
The work under a manufactured home is not identical to a stick-built crawl space, and anyone who quotes it the same way has not been under one. Ground cover, belly repair, and humidity control all have to account for the fact that the space is shallower and access is tighter.
And the houses that were already here.
Away from the new communities, Millsboro has the housing stock of a town that has been here since the seventeenth century timber trade. Older homes near the ponds and along the original streets, many on bare-dirt crawl spaces with foundation vents and nothing else.
Roughly a quarter of Millsboro residents are sixty-five or older, and a lot of the calls we take here come from people who have lived in the same house for thirty years. The floors start feeling soft and somebody tells them that is just how old houses are. It is not. It is a moisture problem with a cause, and the cause can be found.
What people here ask us.
I just bought new construction in Millsboro. Do I need this?
Maybe not, but it is worth checking. New does not mean dry on ground this close to the Indian River. What we most often find in newer subdivisions is a builder liner that was never sealed at the seams, or a dehumidifier that was never installed or never plugged back in. A free inspection tells you which situation you are in.
Do you work on manufactured homes in Long Neck?
Yes, and it is different work than a stick-built crawl space. The space is shallower, access is tighter, and skirting is not a vapor barrier. Ground cover, belly board repair, and humidity control all have to be handled with that in mind.
Is Long Neck considered Millsboro?
It shares the 19966 zip code and a lot of people use the names interchangeably, but the housing is completely different. Long Neck is largely manufactured housing in land-lease communities on the peninsula between Rehoboth and Indian River Bays. We serve both.
My floors feel soft and the house is older. Is that the crawl space?
Very often, yes. Subfloor absorbing moisture from below loses stiffness, and it feels like a framing problem when it started as a humidity problem. The only way to know is to go under and take readings rather than guess from upstairs.
Do you charge to come look?
No. Estimates are free and done on site, in Millsboro, Long Neck, and everywhere else in Sussex County.