DIY How to Better Insulate the Walls and floors of Your Camper
- homelesslongisland
- Dec 12, 2025
- 3 min read
Short Summary
Improve your camper's insulation with affordable DIY methods using foam boards, Reflectix, fiberglass, and spray foam to keep it warm in winter and cool in summer—boosting comfort and efficiency without professional help.
DIY How to Better Insulate the
Walls and floors of Your Camper complete gut rehab.
Insulating camper walls typically involves a multi-layer approach: reflective bubble wrap to block radiant heat, fiberglass or foam for thermal resistance, and a vapor barrier to prevent moisture buildup. How to better insulate the walls of your camper? Start by cleaning the metal surfaces, then apply layers between the structural ribs for maximum R-value (insulation effectiveness).
- Measure rib spacing with a tape measure and cut Reflectix bubble wrap to fit as the first layer—its air pockets reflect cold/heat.
- Stuff fiberglass batts or 1-inch RMax rigid polyiso foam into ribs without compressing (air traps heat); use spray adhesive like 3M Super 77 for foam. 1 (https://www.instructables.com/How-to-insulate-a-camper-van/
- Add a vapor barrier (plastic sheeting) with tuck tape, ensuring seams overlap to block condensation.
- Seal gaps with Great Stuff spray foam; for ceilings, use Durofoam EPS boards held by tape.
- Resources: Instructables guide for step-by-step photos
Explorist.life for foam layering tips
3 (https://explorist.life/how-to-insulate-a-campervan/; TheVanConversion.com for stick pins and tape methods
Pro Tip: Avoid over-compressing fiberglass—loose fill maximizes insulation. 1 (https://www.instructables.com/How-to-insulate-a-camper-van/
DIY How to Better Insulate the Floors of Your Camper
Floors lose heat quickly due to road exposure, so prioritize rigid, high-compression foam over soft materials. How to better insulate the floors of your camper? Clean and seal the metal floor first, then layer insulation before subfloor plywood. 2 (https://www.lorjorexplore.com/blog/insulating-and-installing-a-campervan-floor) 4 (https://schoandjo.com/camper-van-floor/) 6 (https://www.bluettipower.com/blogs/articles/a-complete-guide-to-insulating-a-van3-easy-steps)
- Lay Reflectix strips in troughs to trap air pockets and reduce emissivity.
- Cut 1-inch XPS foam boards (15-25 PSI rating) to fit ridges, leaving 1/2-inch perimeter gaps; glue with Loctite PL 300.
4 (https://schoandjo.com/camper-van-floor/) 10 (https://faroutride.com/floor/
- Top with marine-grade plywood or LVP flooring, weighting down to adhere; insulate wheel wells extra. 2 (https://www.lorjorexplore.com/blog/insulating-and-installing-a-campervan-floor
- Seal edges with aluminum tape or spray foam for a vapor barrier.
- Resources: LorJorExplore for XPS install
; FarOutRide for material comparisons 10 (https://faroutride.com/floor/); SchoandJo for simple 3-layer system
Pro Tip: Test for cold spots by walking barefoot post-install; add layers if needed.
DIY How to Better Insulate the Windows of Your Camper
Windows are weak points for heat loss—use thermal breaks and covers. How to better insulate the windows of your camper? Identify gaps around frames during inspection, then apply targeted fixes.
- Fill gaps with spray foam or foam boards; use insulating washers as thermal breaks on bolts.
- Cover interiors with Reflectix cut to window size, secured by magnets or tape for removable insulation.
- Add custom curtains from insulated fabric or bubble wrap lined with foil for double-duty (day/night).
- Resources: SimpleVans.eu for gap-sealing guide 5 (https://simplevans.eu/en/blog/3_insulating-your-campervan-a-simple-diy-guide.html; BluettiPower for prep tips
Pro Tip: Combine with window films to block UV and add R-value without permanent changes.
General Materials, Tools, and Safety
Common across all areas: XPS/Polyiso foam (R-5/inch), Reflectix, spray foam, tuck tape, vapor barrier.
3 (https://explorist.life/how-to-insulate-a-campervan/) 10 (https://faroutride.com/floor/ Tools: Exacto knife, scissors, measuring tape, safety gear (gloves, mask for fiberglass.
1 (https://www.instructables.com/How-to-insulate-a-camper-van/ Always ventilate for adhesives; prioritize moisture control to avoid mold.
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