Damp climates ruin insulation. When the batts under your floor are sagging and the attic smells like a wet dog, the old material has to come out before anything new can work.
Tell us what the Chattanooga property is doing and we'll take a look.
Insulation is usually replaced for one of four reasons, and in Chattanooga the first one dominates. Moisture: fiberglass and cellulose that have been wet lose R-value, compress, grow mold and hold odor, and in a crawl space that has been vented into 85-percent-humidity mornings for thirty years they are almost always wet. Rodents and other pests: raccoons in attics and rats in crawl spaces leave droppings, urine and nesting material that make the insulation a health issue rather than an energy one. Fire, smoke or water damage from a roof leak or a burst pipe. And contamination: older homes may have vermiculite that can contain asbestos, which requires a licensed abatement contractor rather than an insulation crew.
In each case adding new material on top locks the problem in. Removal is the honest first step.
Loose-fill attic insulation is removed with a high-volume insulation vacuum. The hose runs from the attic to a machine outside and the material goes into sealed bags, so it does not travel through the house. Batts are bagged by hand in the attic or crawl space. In a crawl space the old vapor barrier, debris and any fallen insulation come out at the same time, and the ground is raked clean.
Where droppings or mold are present, the crew works in respirators and the surfaces are HEPA-vacuumed and treated with an appropriate disinfectant or antimicrobial before new material goes in. If we find what looks like vermiculite, work stops until it has been tested, because that is not something to guess about.
Once the space is clean and dry, we can see what was hidden. Air leaks, wiring problems, disconnected ducts, roof leaks and plumbing drips are all easier to spot on bare framing, and we photograph and note anything that needs another trade's attention.
This is the moment to do it right rather than repeat what failed. In a crawl space the modern replacement is not new batts between the joists but a sealed vapor barrier and closed-cell foam on the walls and rim joist, with the space conditioned instead of vented. That is the assembly Tennessee's residential energy code allows as an alternative to floor insulation, and it is the one that does not get wet again.
In an attic the replacement is air sealing of the attic floor followed by blown insulation to the R-38 that Tennessee's amended climate zone 4 table calls for, or spray foam on the roof deck if the ducts and equipment live up there. In walls that have been opened for renovation, foam fills the cavities. The written scope tells you which, and why.
If the damage came from a covered event such as a burst pipe, storm damage or an animal intrusion, your homeowner's policy may respond. We document the condition with photographs before and after removal and provide an itemized scope that separates removal from replacement, which is what adjusters usually want. Whether a claim is covered is between you and your insurer; we provide the paperwork.
For sellers, a documented removal and replacement is a clean answer to an inspector's note about wet or damaged insulation, and the before-and-after photos travel with the disclosure.
Questions
If the old material is dry, clean and uncontaminated, yes, and we will say so. If it is wet, moldy or fouled by animals, no. New insulation over damaged material traps the moisture and the smell, and the new layer starts absorbing it too.
No. Vermiculite may contain asbestos and its removal is regulated. If we find it we stop, tell you, and refer you to a licensed asbestos abatement contractor. Once it has been removed and cleared, we return to insulate.
The insulation and nesting material are removed by crew in respirators and protective clothing, the surfaces are HEPA-vacuumed and treated, and the entry points the animals used are identified so they can be sealed. Ongoing wildlife exclusion is a separate trade and we can point you to one.
Usually the smell is the symptom of insulation and framing that have been wet for a long time, and in a vented Chattanooga crawl space that is the normal condition rather than a rare one. Replacing the batts alone will not fix it; removing them and sealing and drying the space will.
Tell us what the house is doing and where. We will come look, measure and write a scope you can compare.
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