As an affiliate, we may earn a commission from qualifying purchases. We get commissions for purchases made through links on this website from Amazon and other third parties.
A bed bug should not be able to crawl through a properly made, fully closed mattress encasement. These covers use tightly woven fabric and a protected zipper to seal the entire mattress.
However, an encasement is not automatically bed bug-proof. Bed bugs may escape or enter through a damaged seam, a small tear, an open zipper, or a gap near the zipper end. The encasement also protects only the mattress or box spring. It does not stop bugs from living in the bed frame, headboard, nearby furniture, or cracks around the room.
How a Mattress Encasement Blocks Bed Bugs
A mattress encasement is a cover that surrounds all six sides of a mattress. Unlike a fitted mattress protector, it closes with a zipper.
An encasement designed for bed bug control usually has:
- Fabric with openings too small for bed bugs to pass through
- Strong, sealed seams
- A zipper with small teeth
- A flap or zipper guard covering the zipper end
- A secure closure that does not leave a gap
Check the current product listing before buying. Look for clear manufacturer language stating that the encasement is designed and tested for bed bug protection. Do not assume every zippered mattress cover has the same construction.
Can Bed Bugs Get Through the Fabric?
Bed bugs generally cannot crawl through the intact fabric of a purpose-made bed bug encasement. The fabric is designed to form a physical barrier.
Problems are more likely to happen when:
- The fabric has a hole or tear
- A seam has split
- The cover is worn thin
- The mattress size stretches the cover too tightly
- A sharp bed-frame part punctures it
Bed bugs do not need a large opening. Check the cover regularly, especially around corners, seams, and the zipper.
The Zipper Is Usually the Weakest Point
The fabric may be tightly woven, but a poorly designed zipper can leave an opening. Pay close attention to where the zipper closes.
A suitable encasement should have a zipper guard, zipper stop, or covered closure. This feature blocks the small space at the end of the zipper track.
After installing the encasement:
- Pull the zipper completely closed.
- Check that the zipper slider reaches the end.
- Secure any locking tab or hook included with the cover.
- Make sure the zipper flap lies flat.
- Inspect the closure from several angles.
Follow the manufacturer’s installation instructions. Some products use a specific locking method that must be positioned correctly.
Can Bed Bugs Already Inside the Mattress Get Out?
An intact encasement is intended to trap bed bugs that are already on or inside the covered mattress or box spring. It also removes many folds, seams, and labels where bugs could hide.
Do not remove the encasement too soon. Bed bugs can survive for a long time without feeding, and survival time varies with conditions. Follow the encasement manufacturer’s guidance or advice from a licensed pest professional about how long to leave it in place.
Opening the cover early could release bugs that remain alive inside.
An Encasement Does Not Cover the Whole Bed
A mattress encasement seals the mattress, not the entire sleeping area. Bed bugs can still hide in places such as:
- Box springs that are not encased
- Bed-frame joints
- Screw holes
- Headboards
- Baseboards
- Nightstands
- Upholstered furniture
- Wall cracks
- Items stored under the bed
For this reason, both the mattress and box spring may need separate encasements. Check the product guidance and the recommendations of the pest professional handling the room.
An encasement should be treated as one part of a broader plan. It does not replace room inspection or professional treatment when an infestation is present.
Mattress Protector Versus Mattress Encasement
A standard mattress protector usually covers the top and sides of the mattress. It may help with spills, sweat, or everyday wear, but bed bugs can move underneath it.
- The top
- The bottom
- Both sides
- The head and foot ends
It then closes with a zipper.
Learn where bed bugs may hide despite a mattress cover and how inspecting furniture, monitoring, encasement, treatment, and prevention work together.
A waterproof label does not mean a cover is suitable for bed bugs. Likewise, a zippered cover is not necessarily bed bug-resistant. Read the complete product description and check how the zipper and seams are constructed.
How to Choose the Right Encasement
Measure the mattress carefully
Measure the mattress length, width, and depth. Mattress depth is the height from the bottom edge to the top surface.
Include any built-in pillow top, but do not include removable toppers unless the manufacturer says they can be enclosed together.
An encasement that is too small may strain the seams. One that is too loose may bunch, shift, or make inspection harder.
Check the zipper design
Look for a fully covered zipper end and a closure that can be secured. Avoid covers with an exposed gap where the zipper stops.
Read the product claims carefully
Check whether the manufacturer specifically describes the product as a bed bug mattress encasement. Review the current product listing for test details, installation directions, materials, and limitations.
Consider durability
Pets, metal frames, sharp mattress corners, and frequent moves can damage thin covers. A dorm bed, RV mattress, or child’s bed may also see more climbing, shifting, and washing.
Choose a cover suitable for how the bed is used, and inspect it often.
Check care instructions
Some encasements can be machine washed, while others have limits on water temperature, drying heat, bleach, or ironing. Always follow the care label.
High dryer heat can damage certain waterproof layers, elastic parts, or zipper components. Do not use heat as a pest-control method unless the product manufacturer and a qualified pest professional say it is appropriate.
How to Install an Encasement Without Tearing It
Installation is easier with two people, especially on a large or heavy mattress.
Remove or cover sharp bed-frame parts before starting. Lift the mattress rather than dragging the encasement across the frame.
Slowly slide the cover over the mattress. Do not pull hard on the zipper, seams, or corners. Smooth the fabric before closing the zipper so it does not catch.
After installation:
- Check every seam
- Inspect the bottom surface
- Confirm the zipper is locked
- Keep sharp objects away from the cover
- Recheck it after moving or rotating the mattress
For a child’s bed, guest bed, or pet-friendly bedroom, inspect the cover after rough use, jumping, scratching, or furniture changes.
What to Do If the Encasement Tears
Do not ignore a hole, split seam, or broken zipper. A damaged cover may no longer form a complete barrier.
Avoid opening or removing it without a plan, especially if it was installed to contain an existing problem. Contact the manufacturer for repair or replacement guidance. A licensed pest professional can also advise how to handle the damaged cover without spreading bugs to other areas.
Do not rely on ordinary tape as a guaranteed long-term repair unless the manufacturer specifically recommends it.
Can Bed Bugs Live on the Outside of an Encasement?
Yes. An encasement removes many hiding places from the mattress, but bed bugs can still crawl across or rest on the outside surface.
The smoother cover may make bugs or signs easier to notice, but it does not repel them. Keep sheets, blankets, and bed skirts from touching the floor when possible, and reduce clutter around the bed so inspections are easier.
Any room with a suspected infestation should be assessed carefully. Avoid moving bedding, furniture, or mattresses into another room, since this can spread the problem.
Frequently Asked Questions
Can baby bed bugs get through a mattress encasement?
A purpose-made, undamaged bed bug encasement should be constructed to block both young and adult bed bugs. Small gaps around the zipper, seams, or tears can still create an escape route. Check the manufacturer’s current product claims.
Can bed bug eggs get through an encasement?
Eggs do not crawl through the cover. However, eggs may already be attached to the outside surface or nearby furniture. An encasement covers only the mattress or box spring and does not address the rest of the room.
Will a regular waterproof mattress protector stop bed bugs?
Not necessarily. Most fitted protectors do not seal the bottom of the mattress. Waterproofing protects against liquid, while bed bug protection depends on full coverage, tight fabric, strong seams, and a protected zipper.
Should I encase both the mattress and box spring?
Often, yes. A box spring has many internal spaces and fabric folds where bugs may hide. Use a separate encasement made for the size and depth of each item, and follow professional guidance for the room.
How long should a bed bug encasement stay on?
Leave it installed for the period stated by the manufacturer or recommended by a licensed pest professional. Do not remove it early simply because no bugs are visible.
Can I put sheets over a mattress encasement?
Yes. Put the fitted sheet and normal bedding over the encasement. Be careful with sheet fasteners, safety pins, pet claws, and other sharp objects that could puncture the cover.
Does a mattress encasement get rid of a bed bug infestation?
No. It may trap bugs associated with the enclosed mattress and reduce hiding places, but bugs can remain elsewhere in the room. A suspected infestation may require inspection and a broader control plan.
should i throw out my mattress if it has bed bugs. mattress vacuums work for bed bugs. what kind of steamer can i use for bed bugs.
