Latest / Boondocking Tips: Off-Grid Camping, RV Travel & Van Life / Insulation and Water: How Different RV Insulations Behave and What to Do When They Get Wet

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Insulation and Water: How Different RV Insulations Behave and What to Do When They Get Wet · Boondocking Tips: Off-Grid Camping, RV Travel & Van Life

• 0:00
  SPEAKER_00: Insulation and water, how different RV insulations behave and what to do when they get wet.
• 0:07
  SPEAKER_00: Water damage inside an RV is rarely just an insulation problem.
• 0:11
  SPEAKER_00: A leak can wet the framing, wall skins, adhesives, electrical components, flooring, and air or vapor control layers at the same time.
• 0:21
  SPEAKER_00: The correct repair therefore depends on more than whether the insulation absorbs water.
• 0:27
  SPEAKER_00: The key questions are, how much water entered the material?
• 0:31
  SPEAKER_00: Can every wet surface be exposed and dried?
• 0:34
  SPEAKER_00: Has the insulation lost loft, shape, adhesion, or R-value?
• 0:39
  SPEAKER_00: Was the water clean, gray, or contaminated?
• 0:43
  SPEAKER_00: Can the RV wall or roof be rebuilt without trapping moisture?
• 0:48
  SPEAKER_00: A clean, quickly corrected roof leak is very different from a long-term window leak, plumbing failure, or flood involving sewage or road grime.
• 0:57
  SPEAKER_00: EPA guidance recommends removing, cleaning or drying wet materials within roughly 24 to 48 hours when possible.
• 1:06
  SPEAKER_00: Porous materials that remain wet longer or cannot be thoroughly cleaned are much more likely to require replacement.
• 1:13
  SPEAKER_00: EPA Mold Worker Guide, Quick Comparison, which RV insulations can be saved.
• 1:19
  SPEAKER_00: For the full table, please open this article on boondocking.
• 1:23
  SPEAKER_00: These are material tendencies, not guarantees.
• 1:27
  SPEAKER_00: Water absorption results vary by manufacturer, density, facer, thickness, adhesive, edge treatment, and exposure duration.
• 1:36
  SPEAKER_00: Laboratory water absorption numbers also do not fully predict what happens in an RV wall, where water may enter through a screw, seam, cut edge, or failed adhesive.
• 1:46
  SPEAKER_00: Fiberglass bats.
• 1:48
  SPEAKER_00: How fiberglass behaves when wet.
• 1:51
  SPEAKER_00: Fiberglass is made from inorganic glass fibers, so the fibers themselves do not behave like cotton, cellulose, or wool.
• 1:58
  SPEAKER_00: Clean fiberglass normally resists mold growth and does not permanently absorb large quantities of liquid water.
• 2:05
  SPEAKER_00: However, a bat can still become functionally wet because water collects.
• 2:10
  SPEAKER_00: Between the fibers, in the craft paper or foil facing, in the binder, in dust and road grime, against the wood or metal framing, beneath the bat where it cannot evaporate.
• 2:21
  SPEAKER_00: Owen's corning advises that wet fiberglass should be inspected for residual moisture and contamination, and that contaminated insulation should be removed and replaced.
• 2:31
  SPEAKER_00: Canal similarly notes that clean fiberglass does not support mold growth, but dust and dirt can support growth when they become wet.
• 2:39
  SPEAKER_00: Owens Corning Fiberglass Guidance, Canal Fiberglass Moisture Guidance, Drying Feasibility.
• 2:45
  SPEAKER_00: Fiberglass is one of the more recoverable materials after a small, clean, quickly discovered leak.
• 2:51
  SPEAKER_00: It should be removed from the cavity rather than left compressed against a wet wall skin.
• 2:56
  SPEAKER_00: Lay it loosely in a clean ventilated area, separate layers, and allow air to reach both sides.
• 3:02
  SPEAKER_00: Do not reinstall it merely because the surface feels dry.
• 3:06
  SPEAKER_00: Check for damp paper or foil facing, persistent musty odor, dirt or organic contamination, flattened or permanently compressed areas, missing sections or gaps, evidence that water ran through the bat and into framing.
• 3:22
  SPEAKER_00: Fiberglass generally regains its rated thermal performance only if it returns to its original thickness and remains clean.
• 3:30
  SPEAKER_00: Compression, sagging, gaps, and poor fitting can reduce effective performance even when the fibers are technically dry.
• 3:38
  SPEAKER_00: DOE guidance emphasizes that bats must fit smoothly and completely fill cavities.
• 3:43
  SPEAKER_00: Compression and gaps reduce thermal effectiveness.
• 3:47
  SPEAKER_00: DOE Building America Air Sealing Guide.
• 3:50
  SPEAKER_00: When to replace fiberglass?
• 3:52
  SPEAKER_00: Replace fiberglass bats when they are moldy or visibly contaminated, musty after drying, saturated for an unknown period, stained with sewage, flood water, or road contaminants, permanently compressed or sagging, contaminated with adhesive, oil, or organic debris, impossible to inspect fully after reinstallation.
• 4:13
  SPEAKER_00: For a typical RV, replacement is often more practical than trying to clean a bat that has been trapped behind a wall panel.
• 4:20
  SPEAKER_00: The material may be inexpensive, while reopening the wall later is not.
• 4:25
  SPEAKER_00: Open cell spray foam.
• 4:27
  SPEAKER_00: How open cell foam behaves.
• 4:29
  SPEAKER_00: Open cell spray polyurethane foam has a low density cellular structure and is much more vapor permeable than closed cell foam.
• 4:36
  SPEAKER_00: One representative open cell product lists an aged R value of about R3.7 per inch, water absorption of 5%, and water vapor permeance of 22 perms at 1 inch.
• 4:48
  SPEAKER_00: Exact values vary by product.
• 4:50
  SPEAKER_00: Huntsman Open Cell Foam Technical Data.
• 4:53
  SPEAKER_00: Open cell foam is not automatically ruined by contact with clean water.
• 4:57
  SPEAKER_00: The greater problem is that water can move into the foam and remain against wood framing, wallboard or interior paneling, roof decking, wiring, adhesives, metal components.
• 5:08
  SPEAKER_00: Because open cell foam adheres to the surfaces around it, it may be difficult to expose all sides for drying.
• 5:15
  SPEAKER_00: A wall can appear dry at its opening while remaining wet deeper in the foam or at the substrate.
• 5:20
  SPEAKER_00: Drying and salvage.
• 5:22
  SPEAKER_00: Open cell foam may be salvageable after a small clean leak if the foam is fully cured.
• 5:28
  SPEAKER_00: The water source was repaired promptly.
• 5:30
  SPEAKER_00: The foam is accessible from at least one side.
• 5:33
  SPEAKER_00: There is no odor, staining, or biological growth.
• 5:36
  SPEAKER_00: The framing and sheathing can be confirmed dry.
• 5:38
  SPEAKER_00: The foam remains firmly attached and dimensionally stable.
• 5:42
  SPEAKER_00: It is a poor candidate for do-it-yourself salvage when the foam is saturated inside a closed RV sandwich panel.
• 5:48
  SPEAKER_00: In that situation, cutting inspection openings or removing sections may be necessary.
• 5:54
  SPEAKER_00: Mold and odor risk.
• 5:56
  SPEAKER_00: The foam itself is not usually the main food source for mold.
• 5:59
  SPEAKER_00: The risk comes from dust, wood, paper facers, adhesives, and other materials that remain damp against it.
• 6:06
  SPEAKER_00: A musty odor may indicate wet framing or contaminated surfaces rather than a problem with the polyurethane chemistry.
• 6:15
  SPEAKER_00: If the foam was improperly mixed or applied, however, it may produce a persistent chemical odor.
• 6:23
  SPEAKER_00: EPA notes that cutting or disturbing incompletely cured spray foam can create exposure risks, and that there is no universally accepted removal procedure for problematic installed foam.
• 6:36
  SPEAKER_00: EPA spray polyurethane foam safety guidance.
• 6:40
  SPEAKER_00: Closed cell spray foam, how closed cell foam behaves.
• 6:44
  SPEAKER_00: Closed cell spray foam has a much higher density and a more closed cellular structure.
• 6:50
  SPEAKER_00: DOE describes closed cell foam as having an R value of up to approximately R6.5 per inch and being resistant to moisture vapor, while open cell foam is more vapor permeable and has a lower R value per inch.
• 7:05
  SPEAKER_00: Energy Star Wall Insulation Guide.
• 7:08
  SPEAKER_00: A representative BASF closed cell product lists an R value of roughly R7.0 to R7.6 per inch and water absorption below 4% by volume.
• 7:19
  SPEAKER_00: That number is low compared with absorbent fibrous materials, but it does not mean the foam is waterproof under every condition.
• 7:27
  SPEAKER_00: Water can still enter through cut edges, cracks, voids, seams, delaminated areas, fastener penetrations, interfaces between foam and framing.
• 7:38
  SPEAKER_00: BASF Closed Cell Foam Product Information.
• 7:42
  SPEAKER_00: When closed cell foam can be salvaged, closed cell foam is often the most salvageable insulation after a clean leak.
• 7:49
  SPEAKER_00: It can generally remain in place when it is fully cured, firmly adhered, not shrunken or pulling away from the substrate, free of charring, discoloration, or off-ratio areas, not concealing wet or deteriorating framing.
• 8:04
  SPEAKER_00: Exposed surfaces can be cleaned and dried.
• 8:07
  SPEAKER_00: Building Science Corporation notes that high-density closed cell spray foam has low water absorption and is not generally damaged by flood water, although exposed surfaces still require cleaning and the surrounding assembly must be addressed.
• 8:21
  SPEAKER_00: Building Science Corporation flood guidance.
• 8:24
  SPEAKER_00: The hidden moisture problem, closed cell foam can protect the assembly, but it can also make inspection difficult.
• 8:31
  SPEAKER_00: If water entered behind the foam or through an unsealed edge, the framing may remain wet even while the foam looks normal.
• 8:38
  SPEAKER_00: Do not assume that closed cell means leave everything in place.
• 8:42
  SPEAKER_00: Inspect exposed framing, probe suspicious areas, and compare moisture readings with unaffected portions of the RV.
• 8:50
  SPEAKER_00: If the foam has to be cut out, use cold mechanical methods and follow the product manufacturer's safety instructions.
• 8:57
  SPEAKER_00: Do not use torches, heat guns, grinding, or other hot work methods near polyurethane foam.
• 9:03
  SPEAKER_00: EPA warns that heating or grinding foam can produce hazardous emissions.
• 9:08
  SPEAKER_00: EPS, expanded polystyrene, water absorption and wicking.
• 9:12
  SPEAKER_00: EPS is made from expanded beads.
• 9:14
  SPEAKER_00: Although the beads themselves have closed cells, the spaces between them can remain open enough to absorb and wick water.
• 9:23
  SPEAKER_00: Industry comparisons commonly show substantially greater water absorption for EPS than XPS.
• 9:29
  SPEAKER_00: One technical bulletin lists approximately 3-4% by volume for EPS, compared with about 0.3% for XPS under the sighted test method.
• 9:40
  SPEAKER_00: Owens Corning EPS XPS technical bulletin.
• 9:44
  SPEAKER_00: This distinction matters in RV construction.
• 9:47
  SPEAKER_00: A small leak at the bottom of a wall can wick laterally or upward through EPS, especially when the board is compressed between skins or surrounded by adhesive.
• 9:57
  SPEAKER_00: R-value loss.
• 9:58
  SPEAKER_00: Water in the voids between EPS beads displaces air with a much more conductive medium.
• 10:04
  SPEAKER_00: Laboratory testing described by Owens Corning found continuing water absorption and corresponding R-value loss during extended wet exposure.
• 10:13
  SPEAKER_00: Prolonged moisture and freeze thaw cycling can also damage bead bonds and reduce structural integrity.
• 10:19
  SPEAKER_00: A clean EPS board may eventually dry, but drying can be slow when the board is laminated into an RV wall or floor.
• 10:27
  SPEAKER_00: Salvage is reasonable when the board is removable, clean, undamaged, and can dry completely from all exposed edges.
• 10:34
  SPEAKER_00: Replacement is safer when the board has been wet for an unknown period or remains trapped inside a sealed panel.
• 10:41
  SPEAKER_00: XPS, extruded polystyrene, YXPS generally performs better around water.
• 10:48
  SPEAKER_00: XPS is manufactured as a more continuous closed cell structure.
• 10:52
  SPEAKER_00: Product data for one DuPont XPS sheathing product lists a minimum R value of R5 per inch and maximum water absorption of 0.1% by volume under ASTM C272.
• 11:05
  SPEAKER_00: Other product classifications and manufacturers may list somewhat different values.
• 11:10
  SPEAKER_00: DuPont XPS product sheet.
• 11:12
  SPEAKER_00: The continuous structure means XPS is much less prone to capillary wicking than EPS.
• 11:18
  SPEAKER_00: In comparative testing, XPS showed minimal water absorption and minimal R-value loss, while EPS absorbs substantially more water.
• 11:26
  SPEAKER_00: Salvage criteria.
• 11:28
  SPEAKER_00: XPS is commonly worth salvaging if the board is clean, it remains flat, and dimensionally stable, the surface is not badly gouged, the board has not been dissolved by incompatible chemicals.
• 11:39
  SPEAKER_00: Foil, tape or facer layers remain attached where required.
• 11:42
  SPEAKER_00: Adhesive bonds are still sound, the surrounding framing is dry and undamaged.
• 11:47
  SPEAKER_00: Even when XPS itself is fine, replace wet adhesive or deteriorated facing materials as necessary.
• 11:53
  SPEAKER_00: Do not focus on the board while ignoring water trapped between the board and the RV's exterior or interior skin.
• 12:00
  SPEAKER_00: Polyiso panels, moisture behavior.
• 12:02
  SPEAKER_00: Polyisocyanurate, commonly called polyiso, is a rigid closed-cell foam board, often faced with foil, coated glass, or another laminate.
• 12:11
  SPEAKER_00: Its moisture behavior depends heavily on the specific product and facer.
• 12:15
  SPEAKER_00: PMI testing, under cyclic moisture and temperature exposure, found that the polyiso foam core resisted moisture intrusion and maintained thermal performance.
• 12:26
  SPEAKER_00: A separate PMI comparison reported that polyiso retained approximately 95% of its labeled R value after a 28-day water submersion test.
• 12:38
  SPEAKER_00: Although the organization cautions that such laboratory results do not guarantee field performance.
• 12:45
  SPEAKER_00: PMI Technical Bulletin 602, PMI Technical Bulletin 603.
• 12:51
  SPEAKER_00: At the same time, product data are not identical.
• 12:55
  SPEAKER_00: One GAF polyiso product lists maximum water absorption of 1.5% by volume, and PMI emphasizes that facers can change a board's water absorption, vapor permanence, and suitability for a specific application.
• 13:10
  SPEAKER_00: GAF polyiso datasheet, PMI polyiso classification guidance, salvage criteria.
• 13:17
  SPEAKER_00: Polyiso panels are usually salvageable after clean water exposure if the foil or facer is intact, the board is still flat and rigid, the core has not swollen, crumbled, or softened, the facer has not separated from the foam.
• 13:32
  SPEAKER_00: Edges are not waterlogged, no musty odor remains, the framing and adhesives are dry.
• 13:38
  SPEAKER_00: Replace the panel when the facer has delaminated, the core is friable, the board is permanently warped, or water is trapped inside a laminated wall or floor system.
• 13:48
  SPEAKER_00: Do not assume that a foil facer automatically functions as a perfect vapor barrier after it has been cut, punctured, folded, or poorly taped.
• 13:57
  SPEAKER_00: Re-establish continuity at every seam and perimeter.
• 14:01
  SPEAKER_00: How to decide, salvage or replace.
• 14:04
  SPEAKER_00: Salvage is reasonable when all of these are true.
• 14:07
  SPEAKER_00: The leak was from a known clean source, the water was removed quickly, the insulation can be fully exposed, there is no visible mold or persistent odor, the material has not sagged, swollen, shrunk, or delaminated, the framing and sheathing are sound.
• 14:22
  SPEAKER_00: The insulation can return to its original thickness and shape.
• 14:26
  SPEAKER_00: The air and vapor control layers can be restored.
• 14:29
  SPEAKER_00: The assembly can be monitored before it is closed.
• 14:32
  SPEAKER_00: Replacement is the safer choice when any of these conditions exist.
• 14:36
  SPEAKER_00: The water was sewage, floodwater, or chemically contaminated.
• 14:40
  SPEAKER_00: The wet duration is unknown.
• 14:42
  SPEAKER_00: The insulation is moldy, dirty, or persistently musty.
• 14:46
  SPEAKER_00: Fiberglass is compressed or contaminated.
• 14:48
  SPEAKER_00: EPS remains wet inside a closed panel.
• 14:51
  SPEAKER_00: Open cell foam is saturated and inaccessible.
• 14:54
  SPEAKER_00: Polyiso or another faced board has delaminated.
• 14:58
  SPEAKER_00: Closed cell foam is pulled away from framing or contains obvious voins.
• 15:02
  SPEAKER_00: Wood framing remains wet, stained, soft or deteriorated.
• 15:06
  SPEAKER_00: You cannot inspect the back side of the wall or floor.
• 15:09
  SPEAKER_00: The cost of reopening the RV later would exceed the replacement cost now.
• 15:14
  SPEAKER_00: EPA guidance classifies insulation and similar products as porous materials that can be difficult to clean completely.
• 15:22
  SPEAKER_00: Where materials cannot be dried and fully cleaned, removal is recommended.
• 15:27
  SPEAKER_00: Replacing contaminated fiberglass is often more cost-effective than attempting to restore it.
• 15:33
  SPEAKER_00: EPA water damage cleanup guidance, safe removal techniques.
• 15:38
  SPEAKER_00: Make the RV safe first before opening walls, floors, or ceilings.
• 15:43
  SPEAKER_00: Disconnect shore power, turn off the inverter and battery circuits where practical.
• 15:48
  SPEAKER_00: Shut off propane, check for hidden wiring, plumbing, and gas lines.
• 15:54
  SPEAKER_00: Do not work around energized electrical components.
• 15:57
  SPEAKER_00: Stabilize the RV before removing structural interior panels.
• 16:02
  SPEAKER_00: Keep children, pets, and occupants away from the work area.
• 16:06
  SPEAKER_00: If flood water or sewage entered the RV, stop and consider professional remediation.
• 16:12
  SPEAKER_00: Use appropriate protective equipment for suspected mold or contaminated materials.
• 16:18
  SPEAKER_00: EPA recommends at least an N95 respirator, goggles, and protective gloves.
• 16:24
  SPEAKER_00: Wear long sleeves, long pants, and disposable or washable work clothing.
• 16:29
  SPEAKER_00: CDC Guidance also recommends avoiding dry sweeping and using HEPA filtered cleanup methods where appropriate.
• 16:36
  SPEAKER_00: EPA Mold Cleanup Guide, CDC Disaster Cleanup Guidance.
• 16:41
  SPEAKER_00: Fiberglass may also irritate skin, eyes, and airways.
• 16:45
  SPEAKER_00: Wear gloves, eye protection, long sleeves, and suitable respiratory protection when removing it.
• 16:51
  SPEAKER_00: OSHA insulation handling guidance.
• 16:54
  SPEAKER_00: Remove interior finishes carefully.
• 16:56
  SPEAKER_00: Photograph the assembly before disassembly.
• 16:59
  SPEAKER_00: Mark panel orientation, wire and plumbing locations, fastener locations, existing tape and sealant lines, thickness and type of insulation, locations of vapor retarder facers, any shims or thermal brake materials.
• 17:14
  SPEAKER_00: Use shallow controlled cuts rather than driving a saw deeply into the wall.
• 17:18
  SPEAKER_00: Avoid pulling wet panels away violently, since attached insulation may conceal wires or damage the exterior skin.
• 17:26
  SPEAKER_00: Bag porous materials promptly.
• 17:29
  SPEAKER_00: Place contaminated fiberglass, fabric, wet paper facers, and moldy debris into heavy bags while still in the work area.
• 17:37
  SPEAKER_00: Do not carry loose moldy insulation through the living space.
• 17:40
  SPEAKER_00: Hard, non-porous surfaces can generally be cleaned with detergent and water, but do not mix cleaning chemicals and do not use bleach on metal components.
• 17:50
  SPEAKER_00: Dry with controlled airflow.
• 17:52
  SPEAKER_00: Use fans and dehumidification only after visible mold has been cleaned or removed.
• 17:58
  SPEAKER_00: EPA warns that fans can spread spores when mold is already present.
• 18:02
  SPEAKER_00: Avoid unvented propane heaters because combustion adds water vapor and creates fire and carbon monoxide hazards.
• 18:10
  SPEAKER_00: Dry the framing, skins, adhesives, and cavities, not merely the insulation.
• 18:15
  SPEAKER_00: Do not close the wall because the insulation feels dry if the wood or adhesive remains damp.
• 18:22
  SPEAKER_00: Reinstallation, restore the whole assembly.
• 18:25
  SPEAKER_00: Insulation is only one part of an RV enclosure.
• 18:28
  SPEAKER_00: A reliable rebuild restores four connected functions.
• 18:32
  SPEAKER_00: Water control keeps rain and splash water out.
• 18:35
  SPEAKER_00: Air control prevents uncontrolled air movement through the wall.
• 18:40
  SPEAKER_00: Thermal control maintains continuous insulation.
• 18:44
  SPEAKER_00: Vapor control limits vapor movement where the climate and assembly require it.
• 18:49
  SPEAKER_00: DOE guidance stresses that air permeable insulation, such as fiberglass, is not an air seal.
• 18:56
  SPEAKER_00: Rigid foam or spray foam can serve as part of an air control layer only when seams, edges, and penetrations are made continuous.
• 19:05
  SPEAKER_00: Rigid foam used as an air barrier should be taped at seams and sealed at edges to framing.
• 19:12
  SPEAKER_00: DOE Building America Air Sealing Guide.
• 19:14
  SPEAKER_00: Reinstalling fiberglass.
• 19:17
  SPEAKER_00: Use the correct thickness for the cavity.
• 19:19
  SPEAKER_00: Cut around wires and plumbing instead of compressing the bat.
• 19:23
  SPEAKER_00: Fill the cavity completely without bulges or voids.
• 19:27
  SPEAKER_00: Keep the bat dry during installation.
• 19:29
  SPEAKER_00: Do not treat fiberglass as the air barrier.
• 19:32
  SPEAKER_00: Restore the original facing or vapor control layer where appropriate.
• 19:37
  SPEAKER_00: Seal penetrations through the air control layer.
• 19:40
  SPEAKER_00: Avoid adding a new interior polyethylene sheet automatically.
• 19:44
  SPEAKER_00: In a thin RV wall, creating an impermeable sandwich on both sides can reduce drying potential.
• 19:51
  SPEAKER_00: Match the original construction and consider the RV's climate, heating and cooling pattern, and exterior skin.
• 19:58
  SPEAKER_00: Reinstalling rigid foam.
• 20:00
  SPEAKER_00: For EPS, XPS or polyiso, replace damaged boards rather than filling large gaps with scrap.
• 20:08
  SPEAKER_00: Fit boards tightly to the cavity.
• 20:10
  SPEAKER_00: Seal perimeter gaps with a manufacturer-approved product.
• 20:14
  SPEAKER_00: Tape foil or facer seams with compatible tape.
• 20:17
  SPEAKER_00: Seal wire and plumbing penetrations.
• 20:20
  SPEAKER_00: Use compatible adhesives.
• 20:22
  SPEAKER_00: Some solvents and sealants can damage foam.
• 20:25
  SPEAKER_00: Keep joints staggered where multiple layers are used.
• 20:28
  SPEAKER_00: Maintain access to components that may need future service.
• 20:32
  SPEAKER_00: Continuous rigid insulation can reduce thermal bridging by placing an uninterrupted layer across framing members.
• 20:40
  SPEAKER_00: DOE continuous insulation guidance.
• 20:42
  SPEAKER_00: Reinstalling spray foam should be installed only on a dry, prepared substrate and according to the specific product instructions.
• 20:50
  SPEAKER_00: Open cell and closed cell foams are not interchangeable.
• 20:54
  SPEAKER_00: Open cell foam may require a separate vapor control strategy.
• 20:58
  SPEAKER_00: Closed cell foam provides greater moisture resistance and higher R value per inch.
• 21:03
  SPEAKER_00: Both types require proper thickness, curing, fire protection, and careful treatment around wiring and heat-producing equipment.
• 21:11
  SPEAKER_00: Large area spray foam work should be performed by a qualified installer.
• 21:15
  SPEAKER_00: Occupants should remain out of the RV during application and until the product has fully cured and the space has been ventilated according to the manufacturer's instructions.
• 21:26
  SPEAKER_00: Preventing future wicking and thermal bridging.
• 21:29
  SPEAKER_00: Stop water before it reaches the insulation.
• 21:32
  SPEAKER_00: The most effective insulation repair is a durable exterior water repair.
• 21:37
  SPEAKER_00: Inspect roof seams and penetrations, skylights and air conditioner openings, windows and corner moldings, marker lights, plumbing penetrations, slide-out seals, underbody panels, wheel well areas, exterior fasteners, roof-to-wall transitions.
• 21:56
  SPEAKER_00: Use the sealant and repair method specified for the RV skin material.
• 22:00
  SPEAKER_00: Do not cover a failed seam with a second product unless the two materials are chemically compatible.
• 22:07
  SPEAKER_00: Break capillary paths.
• 22:09
  SPEAKER_00: Prevent water from wicking into insulation by sealing exposed foam board edges where appropriate.
• 22:15
  SPEAKER_00: Keeping insulation above drainage paths.
• 22:18
  SPEAKER_00: Providing a bottom exit or drainage route where the design allows.
• 22:22
  SPEAKER_00: Avoiding absorbent materials in repeatedly splash wet areas, separating wet exterior skins from interior finishes, sealing plumbing penetrations and pipe chases, installing drip pads below windows and roof penetrations.
• 22:36
  SPEAKER_00: Do not trap water between two impermeable layers without a drainage or drying strategy.
• 22:42
  SPEAKER_00: Reduce thermal bridging at framing.
• 22:44
  SPEAKER_00: Metal studs, chassis rails, screws, brackets, window frames, and roof bows can bypass cavity insulation.
• 22:52
  SPEAKER_00: The result is a colder interior surface, greater heat loss, and a higher chance of condensation.
• 22:58
  SPEAKER_00: Useful strategies include adding continuous rigid insulation across framing, installing thermal brake strips between metal framing and interior panels, keeping insulation continuous over steel rails where practical, sealing the perimeter of rigid boards, avoiding compressed bats around framing, paying special attention to corners, window openings, roof edges, and floor transitions, staggering seams and multiple layers of board insulation.
• 23:26
  SPEAKER_00: Building America describes continuous insulation as an uninterrupted layer that spans structural supports and reduces thermal bridges.
• 23:35
  SPEAKER_00: It also emphasizes that the thermal boundary and air control layer should remain aligned.
• 23:41
  SPEAKER_00: Final takeaway: the safest general rule is fiberglass, salvage only when clean, dry, and still fluffy.
• 23:48
  SPEAKER_00: Open cell foam, treat saturated or inaccessible foam cautiously.
• 23:53
  SPEAKER_00: The surrounding framing is often the real concern.
• 23:56
  SPEAKER_00: Closed cell foam, frequently salvageable, but inspect the substrate and avoid assuming that the foam hid no damage.
• 24:04
  SPEAKER_00: EPS, more vulnerable to wicking and wet R-value loss, replace when prolonged wetting or trapped moisture is suspected.
• 24:12
  SPEAKER_00: XPS, usually the easiest rigid board to salvage if it remains intact.
• 24:17
  SPEAKER_00: Polyiso, often salvageable, but inspect facers, edges, adhesives, and delamination carefully.
• 24:24
  SPEAKER_00: The best repair is not simply to install new insulation, it is to find and repair the water source, remove contaminated materials, dry the complete assembly, restore air and vapor control, and eliminate the pathways that cause the original damage.
• 24:38
  SPEAKER_00: All links to sources are available in the text version of this article.
• 24:43
  SPEAKER_00: You can find the full article at Boondocking Tips blog.
• 24:47
  SPEAKER_00: Thanks for listening.
• 24:49
  SPEAKER_00: For more research driven boondocking guides, off grid camping tips, RV travel advice, and van life strategies, visit boondocking.tips for the full written research and new camping updates.